JP7690247B1 - Distributed constant type noise filter - Google Patents

Abstract

A distributed constant type noise filter for removing noise from two or more types of power supplies is provided.
[Solution]
The capacitor includes a first cathode portion, a second cathode portion, a first capacitor portion disposed between the first cathode portion and the second cathode portion via a dielectric and having a first metal plate extending in a first direction, and a second capacitor portion stacked on the first capacitor portion, disposed between the second cathode portion and a third cathode portion via a dielectric and having a second metal plate extending in a second direction, wherein the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction, and the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the second direction, the first capacitor portion is connected to one power source and the second capacitor portion is connected to the other power source, and the first direction and the second direction intersect with each other at a predetermined angle.

[Selected Figure] Figure 1

Description

The present invention relates to a distributed constant type noise filter, and more particularly to a distributed constant type noise filter compatible with multiple power sources and having excellent high-frequency characteristics over a wide band.

In recent years, as electronic devices have become smaller and faster, the wiring pitch of the semiconductor elements used in them has become finer, and clock speeds have also become faster.

As a result, high-frequency currents are generated in LSIs and other devices, which do not remain in the vicinity of the LSI but spread over a wide area of mounted circuit boards such as printed wiring boards, are inductively coupled to signal wiring and ground wiring, and leak as electromagnetic waves from signal cables, etc., becoming a serious electromagnetic radiation problem.

An effective solution to these problems is to isolate the LSI, which is the source of high-frequency current, from the power supply system at high frequencies, i.e., by using power supply decoupling techniques.

In addition, as a method for achieving this, noise filters such as bypass capacitors have traditionally been used as decoupling elements.

The development of low-impedance noise filters is necessary for power decoupling of LSIs that operate at high speeds, but due to the self-resonance phenomenon of capacitors, it is difficult to maintain low impedance up to high frequencies.

As capacitors used as low-impedance noise filters, two-terminal lumped-element noise filters have been developed, including solid electrolytic capacitors, electric double-layer capacitors, and ceramic capacitors.

In order to use these capacitors to eliminate electrical noise over a wide frequency band, it is necessary to implement multiple types of capacitors, such as aluminum electrolytic capacitors, tantalum capacitors, ceramic capacitors, and other different types of capacitors with different self-resonant frequencies.

JP2002-164760

In the above Patent Document 1,
The distributed constant type noise filter includes a distributed constant circuit forming portion formed by sandwiching a substantially flat metal plate between two substantially flat dielectrics. The distributed constant type noise filter further includes a cathode terminal electrically connected to the distributed constant circuit forming portion, an electrode portion formed by a part of the metal plate protruding from the dielectric, and an anode terminal electrically connected to the electrode portion. In the distributed constant type noise filter having such a configuration, the ratio of the short-side length W of the distributed constant circuit forming portion to the effective thickness h of the dielectric and the long-side length L of the distributed constant circuit forming portion are set based on the dielectric constant of the distributed constant circuit forming portion so as to remove electrical noise generated from electronic components over a wide band.

As a result, while it is possible to eliminate noise from one type of power supply, the problem remains that it is difficult to eliminate noise from two or more types of power supplies.

The present invention makes it possible to remove noise in a wide frequency band from two or more types of power supply voltages using a single distributed constant type noise filter element.

In the distributed constant type noise filter according to the present invention,
A distributed constant type noise filter that can be connected to two power sources,
a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction;
a second capacitor section that is stacked on the first capacitor section, is disposed between the second cathode section and the third cathode section via a dielectric, and has a second metal plate extending in the second direction;
the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction,
the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the second direction,
the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply;
The first direction and the second direction intersect with each other at a predetermined angle.

The distributed constant type noise filter according to the present invention can effectively remove noise from two or more types of power sources.

The distributed constant type noise filter according to the present invention comprises:
A distributed constant type noise filter that can be connected to two power sources,
a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction;
a second capacitor section that is stacked on the first capacitor section, is disposed between the second cathode section and the third cathode section via a dielectric, and has a second metal plate extending in the second direction;
the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction,
the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the second direction,
the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply;
The first direction and the second direction are characterized by intersecting each other at a predetermined angle, so that noise from two or more types of power sources can be effectively removed, and when decoupling the power sources of an LSI that operates at high speed and requires two or more types of power sources, it is no longer necessary to mount a plurality of different types of capacitors, for example, aluminum electrolytic capacitors, tantalum capacitors, ceramic capacitors, and other different types of capacitors with different self-resonant frequencies, and it becomes possible to handle the situation with fewer components, which leads to a reduction in the number of components, a reduction in component area, and a reduction in the cost and time of component mounting, thereby contributing to the IT industry and, further, to a reduction in CO2 emissions, thereby contributing to the SDGs.

Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. FIG. 1 is a top view of a cathode and a cathode terminal according to an embodiment of the present invention. FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a second metal plate, a third electrode portion, and a fourth electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a cross-sectional perspective view of a solid electrolytic capacitor for explaining the present invention; FIG. 1 is a perspective view showing a distributed constant circuit forming portion in one embodiment of the present invention; Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. FIG. 1 is a top view of a cathode and a cathode terminal according to an embodiment of the present invention. FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a second metal plate, a third electrode portion, and a fourth electrode portion according to an embodiment of the present invention; Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a second metal plate, a third electrode portion, and a fourth electrode portion according to an embodiment of the present invention; Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. FIG. 1 is a top view of a first metal plate, a first electrode portion, a second electrode portion, a second metal plate, a third electrode portion, and a fourth electrode portion in an embodiment of the present invention; FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a first metal plate, a first electrode portion, a second electrode portion, a second metal plate, a third electrode portion, and a fourth electrode portion in an embodiment of the present invention; Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. Top view and cross-sectional view of one embodiment of the present invention. FIG. 1 is a top view of a cathode and a cathode terminal according to an embodiment of the present invention. FIG. 1 is a top view of a cathode and a cathode terminal according to an embodiment of the present invention. FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; FIG. 1 is a top view of a first metal plate, a first electrode portion, and a second electrode portion according to an embodiment of the present invention; A cross-sectional view of a cathode partition in one embodiment of the present invention.

Hereinafter, an embodiment will be described with reference to the drawings.
In the description of the drawings, the same elements are given the same reference numerals, and duplicated description is omitted. The drawings are intended to facilitate understanding, and the actual dimensional ratios do not necessarily coincide with those of the actual objects. Of course, the drawings also include parts in which the dimensional relationships and ratios differ from one another. The embodiments shown below are examples of devices and methods for embodying the technical ideas of this invention, and the embodiments of this invention do not specify the materials, shapes, structures, arrangements, etc. of the components as described below.

Figure 1 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 1(a) is the top view and Figure 1(b) is the A-A cross-sectional view of Figure 1(a).

Figure 2 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 2(a) is a top view and Figure 2(b) is a cross-sectional view taken along line B-B of Figure 2(a).

Figure 3 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 3(a) is a top view and Figure 3(b) is a cross-sectional view taken along the line C-C of Figure 3(a).

Figure 4 is a top view of the cathode and cathode terminal in one embodiment of the present invention. Figure 4 shows an example having a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, with the cathode 2 having a hexagonal shape.

Figure 5 is a top view of a first metal plate, a first electrode portion, and a second electrode portion in one embodiment of the present invention, showing an example having a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, in which the first metal plate has a hexagonal shape.

Figure 6 is a top view of the second metal plate, third electrode portion, and fourth electrode portion in one embodiment of the present invention, showing an example having a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6, in which the second metal plate 8 has a hexagonal shape.

In the top view of FIG. 1(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

In addition, in the cross-sectional view of FIG.
The cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

Next, in the top view of FIG. 2(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The first metal plate 7 has a first electrode portion 3 at one end thereof, and a second electrode portion 4 at the other end thereof.

Next, in the top view of FIG. 3(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
the capacitor formation portion includes a first capacitor and a second capacitor;
The second metal plate 8 has a third electrode portion 5 at one end thereof, and a fourth electrode portion 6 at the other end thereof.

Here, in FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9.
The first capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

In this case, the area of the first metal plate 7 in FIG. 5 may be smaller than the area of the cathode 2 in FIG. 4, in order to effectively contain the electromagnetic radiation noise from the first metal plate 7.

Furthermore, in FIG. 5, one portion of the first metal plate 7 that protrudes to the outside on both sides forming the first capacitor is the first electrode portion 3, and the other portion is the second electrode portion 4.

In a distributed constant type noise filter configured as described above, the first electrode portion 3 is connected to the power terminal of the first power supply, and the second electrode portion 4 is connected to the first power terminal of the electronic component, so that the voltage supplied from the power terminal of the first power supply can be supplied to the first power terminal of the electronic component while reducing noise in the voltage.

Also, in FIG.
The second metal plate 8 forms a second capacitor by the second cathode portion 2b and the third cathode portion 2c through the second dielectric 10.
The second capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

In this case, the area of the second metal plate 8 in FIG. 6 may be smaller than the area of the cathode 2 in FIG. 4, in order to effectively contain the electromagnetic radiation noise from the second metal plate 8.

Furthermore, in FIG. 6, one portion of the second metal plate 8 that protrudes to the outside on both sides forming the second capacitor is the third electrode portion 5, and the other portion is the fourth electrode portion 6.

In a distributed constant type noise filter configured as described above, the third electrode portion 5 is connected to the power terminal of the second power supply, and the fourth electrode portion 6 is connected to the second power terminal of the electronic component, so that the voltage supplied from the power terminal of the second power supply can be supplied to the second power terminal of the electronic component while reducing noise in the voltage.

Furthermore, as shown in FIG.
The cathode 2 is connected to a fixed potential such as ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc., and functions as a distributed constant type noise filter with a wide frequency band.
In addition, for first cathode portion 2a, second cathode portion 2b, third cathode portion 2c, fourth cathode portion 2d, fifth cathode portion 2e, sixth cathode portion 2f, and seventh cathode portion 2g surrounding the first metal plate 7 and the second metal plate 8, the surfaces facing the first metal plate 7 and the second metal plate 8 are smoothed by chemical mechanical polishing called CMP (Chemical Mechanical Polishing), etc., so that it is possible to obtain stable characteristics as a distributed constant type noise filter.

In this manner, the distributed constant type noise filter of the present invention effectively removes noise generated when power is supplied from two or more types of power sources.

Here, we will explain distributed constant type noise filters.

Figure 7 is a top view of a first metal plate, a first electrode portion, and a second electrode portion in one embodiment of the present invention, which has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, and the first metal plate has a rectangular shape.

At this time, the first metal plate 7 in FIG.
A first capacitor can be formed by sandwiching a first cathode portion 2a and a second cathode portion 2b having an area equal to or larger than the area of the first metal plate 7 and a shape similar to that of the cathode 2 in FIG. 4 with a dielectric therebetween.

In addition, when forming a distributed constant type noise filter, it is possible to make the transmission line as a metal plate hexagonal as shown in FIG. 5. This hexagon may also be a hexagon with different side lengths and interior angles.
Furthermore, the angle between the first metal plate 7 and the second metal plate 8 can theoretically be greater than 0 degrees and less than 180 degrees. However, by making the angle 60 degrees or less, the filter characteristics of the distributed constant type noise filter can be improved while taking into account the mounting area of each electrode portion.
In addition, as shown in FIG. 7 , the transmission path as a metal plate can be rectangular, or it can be another shape, such as an octagon or other polygon or an ellipse, and the sides and corners can also be arcs. By changing the shape of the metal plate in this way, it is possible to change the characteristics of the distributed constant noise filter and it is also possible to change the overall shape of the distributed constant noise filter to match its mounting position.

Similarly, when forming a distributed constant type noise filter, the shape of the cathode can be hexagonal as shown in FIG. 4, and this hexagon can also be a hexagon with different side lengths and interior angles, or it can be rectangular like metal plate 7 in FIG. 7, or it can be another shape such as an octagon or other polygon or an ellipse, and the sides and corners can be arcs. By changing the shape of the cathode, it is possible to change the characteristics of the distributed constant type noise filter, and it is also possible to change the overall shape of the distributed constant type noise filter to match its mounting position.

Here, assuming that the length of the long side of the distributed constant type noise filter is L1 and the length of the short side of the distributed constant circuit forming part is W1, referring to the example in Figure 7, it is possible to calculate values such as capacitance by taking into account the relative dielectric constant of the dielectric between the first metal plate and the cathode and the distance between the first metal plate 7 and the cathode.

At this time, both electrode parts of the distributed constant type noise filter are connected to the first electrode part 3 connected to the power supply terminal of the first power supply and the second electrode part 4 connected to the first power supply terminal of an electronic component such as an LSI, and are further connected to a fixed potential such as ground potential through the first cathode part 2a, which is the bottom surface of the cathode as the opposing metal layer of the distributed constant circuit forming part, the first cathode terminal 11, the second cathode terminal 12, etc., so that it can function as a distributed constant type noise filter with a wide frequency band.

Although the first capacitor has been described here, the same concept can be applied to the second capacitor, and the second capacitor can also function as a distributed constant type noise filter with a wide frequency band.

Here, we will explain an example of a distributed constant type noise filter by referring to the example of an aluminum solid electrolytic capacitor.

Figure 8 is a cross-sectional perspective view of a solid electrolytic capacitor for explaining the present invention, and the structure of an aluminum solid electrolytic capacitor is basically the same.

Here, in the solid electrolytic capacitor of FIG. 8, the upper and lower surfaces of the metal plate 13 have oxide films 14, the upper part of the upper oxide film 14 and the lower part of the lower oxide film 14 have solid electrolyte layers 15 such as conductive polymers, and the upper part of the upper solid electrolyte layer 15 such as conductive polymers and the lower part of the lower solid electrolyte layer 15 such as conductive polymers have graphite and silver paste layers 16.

This configuration has a strip line structure similar to that of a distributed constant type noise filter, with the metal plate 13 corresponding to the transmission line, the oxide film 14 corresponding to the dielectric, and the solid electrolyte layer 15 such as a conductive polymer, and the graphite and silver paste layer 16 corresponding to a fixed potential such as the ground potential.

Furthermore, aluminum foil or the like is used as the metal plate 13, and its surface is made uneven by etching or the like to increase its surface area, and an oxide film is formed on the surface as a dielectric. This makes it possible to obtain a larger capacitance than a ceramic capacitor using a single material for the same shape, making it suitable for a distributed constant type noise filter.

Here, we will explain the structure of the distributed constant type noise filter of the present invention, which can remove electrical noise over a wide band and at high frequencies.

Figure 9 is a perspective view showing the distributed constant circuit forming section in one embodiment of the present invention.

In this case, in a transmission line model in which an internal metal plate 13 is sandwiched between a pair of metal plates 18 at GND potential via a third dielectric 17 as shown in Figure 9, the capacitance C and inductance L per unit length can be calculated easily by specifying the line width W1, line length L1, thickness D1 equivalent to the thickness of the dielectric, etc.

The dielectric constant values used in the calculations are around 10 for aluminum oxide, but tantalum oxide has a dielectric constant of 24, for example. The dielectric constant differs depending on the oxide film of the metal. If a ceramic material such as barium titanate is used, the dielectric constant will be 2000 or more. By changing the material itself, such as the metal plate, it is possible to obtain a different dielectric constant depending on the oxide film.

In addition, in the case of an aluminum solid electrolytic capacitor, if we assume that the distributed constant circuit forming part is an aluminum whose surface area has been expanded by approximately 300 times due to etching and an oxide film has been formed on it, then when considering an electric double layer capacitor, the distributed constant circuit forming part occurs at the interface between the activated carbon electrode surface and the electrolyte, so the calculated result of the capacitance C is estimated to have a surface area of 300 times, and the actual capacitance C will be even larger.

Furthermore, the wavelength in the distributed constant circuit forming portion can be calculated by the following formula, taking into consideration the wavelength shortening caused by the dielectric.
λ＝c/f _εr1 ^/2
Here, λ is the wavelength (m), c is the speed of light 3.0×10 ⁸ m/s, f is the frequency Hz, and ε _r is the relative dielectric constant.

As an example of the frequency range of noise regulations generally required, if 30 MHz to 1 GHz is set, the wavelength at 30 MHz, which is the longest, will be calculated by considering _εr equivalently, and the wavelength value will be different for aluminum electrolytic capacitors and ceramic capacitors.

In this case, to achieve sufficient attenuation, it is desirable to make the length of the noise filter's long side equal to or greater than 1/4 wavelength.

In this case, by using an aluminum electrolytic capacitor or a ceramic capacitor and by adjusting the length of the noise filter in the long side direction, a distributed constant type noise filter that can remove electrical noise over a wide band can be obtained.

In this case, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 in FIG. 1(b) the same value or different values, it is possible to change the capacitance of the first capacitor formed by the first metal plate 7 and the capacitance of the second capacitor formed by the second metal plate 8, and it is also possible to change the impedance characteristics at each frequency.

Furthermore, in FIG. 1(a), it is also possible to connect the first electrode portion 3 and the third electrode portion 5 to the power terminal of the same power source, and to connect the second electrode portion 4 and the fourth electrode portion 6 to the power terminal of the same voltage of the same electronic component.

In this case, a capacitor is constructed having the combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8. Furthermore, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 different values, it is possible to obtain further improved impedance characteristics at a plurality of specific frequencies, for example.

In addition to being characterized by large capacity, the distributed constant type noise filter of the present invention is also characterized by having lower impedance over a wide frequency band from low to high frequencies compared to conventionally used multilayer ceramic chip capacitors.

Therefore, it is expected that it will be possible to replace the multiple mounting of different types of capacitors, such as aluminum electrolytic capacitors, tantalum capacitors, ceramic capacitors, etc., which have different self-resonant frequencies, with a smaller number of capacitors.

Next, we will explain the case where the capacitor formation portion of the present invention is rectangular rather than hexagonal as in Figure 1.

Figure 10 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 10(a) is a top view and Figure 10(b) is a cross-sectional view taken along line D-D of Figure 10(a).

Figure 11 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 11(a) is a top view and Figure 11(b) is a cross-sectional view taken along line E-E of Figure 11(a).

Figure 12 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 12(a) is a top view and Figure 12(b) is a cross-sectional view taken along line F-F of Figure 12(a).

Figure 13 is a top view of the cathode and cathode terminal in one embodiment of the present invention. In Figure 13, there is a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a rectangular shape.

Figure 14 is a top view of a first metal plate, a first electrode portion, and a second electrode portion in one embodiment of the present invention, which has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, where the first electrode portion 3 and the second electrode portion 4 are located in a line-symmetrical direction from the center line of the first metal plate 7, and the first metal plate 7 has a rectangular shape.

Figure 15 is a top view of the second metal plate, third electrode portion, and fourth electrode portion in one embodiment of the present invention, which has a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6, where the third electrode portion 5 and the fourth electrode portion 6 are located in a line-symmetrical direction from the center line of the second metal plate 8, and the second metal plate 8 has a rectangular shape.

In the top view of FIG. 10(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

In addition, in the cross-sectional view of FIG.
The cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

Next, in the top view of FIG. 11(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The first metal plate 7 has a first electrode portion 3 at one end thereof, and a second electrode portion 4 at the other end thereof.

Next, in the top view of FIG. 12(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
the capacitor formation portion includes a first capacitor and a second capacitor;
The second metal plate 8 has a third electrode portion 5 at one end thereof, and a fourth electrode portion 6 at the other end thereof.

Here, in FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9.
The first capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

In this case, the area of the first metal plate 7 in FIG. 14 may be smaller than the area of the cathode 2 in FIG. 13, in order to effectively contain the electromagnetic radiation noise from the first metal plate 7.

Furthermore, in FIG. 14, one portion of the first metal plate 7 that protrudes to the outside on both sides forming the first capacitor is the first electrode portion 3, and the other portion is the second electrode portion 4.

In a distributed constant type noise filter configured as described above, the first electrode portion 3 is connected to the power terminal of the first power supply, and the second electrode portion 4 is connected to the first power terminal of the electronic component, so that the voltage supplied from the power terminal of the first power supply can be supplied to the first power terminal of the electronic component while reducing noise in the voltage.

Also, in FIG.
The second metal plate 8 forms a second capacitor by the second cathode portion 2b and the third cathode portion 2c through the second dielectric 10.
The second capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

In this case, the area of the second metal plate 8 in FIG. 15 may be smaller than the area of the cathode 2 in FIG. 13, in order to effectively contain the electromagnetic radiation noise from the second metal plate 8.

Furthermore, in FIG. 15, one portion of the second metal plate 8 that protrudes to the outside on both sides forming the second capacitor is the third electrode portion 5, and the other portion is the fourth electrode portion 6.

In a distributed constant type noise filter configured as described above, the third electrode portion 5 is connected to the power terminal of the second power supply, and the fourth electrode portion 6 is connected to the second power terminal of the electronic component, so that the voltage supplied from the power terminal of the second power supply can be supplied to the second power terminal of the electronic component while reducing noise in the voltage.

Furthermore, as shown in FIG.
The cathode 2 is connected to a fixed potential such as ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc., and functions as a distributed constant type noise filter with a wide frequency band.

In this manner, the distributed constant type noise filter of the present invention effectively removes noise generated when power is supplied from two or more types of power sources.

In addition, in this case, by making the dielectric constant of the first dielectric 9 and the dielectric constant of the second dielectric 10 in FIG. 10(b) the same value or different values, the capacitance of the first capacitor formed by the first metal plate 7 and the capacitance of the second capacitor formed by the second metal plate 8 can be changed, and it is also possible to change the impedance characteristics at each frequency.

Furthermore, in FIG. 10(a), it is also possible to connect the first electrode portion 3 and the third electrode portion 5 to the power terminal of the same power source, and to connect the second electrode portion 4 and the fourth electrode portion 6 to the power terminal of the same voltage of the same electronic component.

In this case, a capacitor is constructed having the combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8. Furthermore, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 different values, it is possible to obtain further improved impedance characteristics at a plurality of specific frequencies, for example.

Next, we will explain the case where the capacitor formation portion of the present invention is rectangular rather than hexagonal as in Figure 1, and the electrode portions of the metal plate are in a cross direction.

Figure 16 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 16(a) is a top view and Figure 16(b) is a cross-sectional view taken along line G-G of Figure 16(a).

Figure 17 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 17(a) is a top view and Figure 17(b) is a cross-sectional view taken along line H-H of Figure 17(a).

Figure 18 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 18(a) is a top view and Figure 18(b) is a cross-sectional view taken along line I-I of Figure 18(a).

Figure 13 is a top view of the cathode and cathode terminal in one embodiment of the present invention. In Figure 13, there is a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a rectangular shape.

Figure 19 is a top view of a first metal plate, a first electrode portion, and a second electrode portion in one embodiment of the present invention, which has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, where the first metal plate 7 has a rectangular shape, and the first electrode portion 3 and the second electrode portion 4 are located in a point-symmetrical direction from the center point of the first metal plate 7.

Figure 20 is a top view of the second metal plate, third electrode portion, and fourth electrode portion in one embodiment of the present invention, which has a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6, where the second metal plate 8 has a rectangular shape, and the third electrode portion 5 and the fourth electrode portion 6 are located in a point-symmetric direction from the center point of the second metal plate 8.

In the top view of FIG. 16(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

In the cross-sectional view of FIG. 16( b ), the cathode 2 is formed of a first cathode portion 2 a, a second cathode portion 2 b, a third cathode portion 2 c, a fourth cathode portion 2 d, a fifth cathode portion 2 e, a sixth cathode portion 2 f, and a seventh cathode portion 2 g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

Next, in the top view of FIG. 17(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The first metal plate 7 has a first electrode portion 3 at one end thereof, and a second electrode portion 4 at the other end thereof.

Next, in the top view of FIG. 18(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
the capacitor formation portion includes a first capacitor and a second capacitor;
The second metal plate 8 has a third electrode portion 5 at one end thereof, and a fourth electrode portion 6 at the other end thereof.

■ Capacitor generation status

Here, in FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9.
The first capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

In this case, the area of the first metal plate 7 in FIG. 19 may be smaller than the area of the cathode 2 in FIG. 13, in order to effectively contain the electromagnetic radiation noise from the first metal plate 7.

Further, in FIG.
One portion of the first metal plate 7 that protrudes outside on both sides forming the first capacitor is the first electrode portion 3, and the other portion is the second electrode portion 4. However, since the distance from the first electrode portion 3 to the second electrode portion 4 is longer than the distance from the first electrode portion 3 to the second electrode portion 4 in FIG. 14, it is expected that noise in a wider frequency band can be efficiently removed.

Furthermore, by not only arranging the first electrode portion 3 and the second electrode portion 4 in a direction point-symmetrical with respect to the center point of the first metal plate 7, but also flexibly changing their positions on the opposing sides of the first metal plate 7 and changing the size and shape of the first electrode portion 3 and the second electrode portion 4, it becomes possible to flexibly respond to the position and situation of the power supply source and power supply destination.

In a distributed constant type noise filter configured as described above, the first electrode portion 3 is connected to the power terminal of the first power supply, and the second electrode portion 4 is connected to the first power terminal of the electronic component, so that the voltage supplied from the power terminal of the first power supply can be supplied to the first power terminal of the electronic component while reducing noise in the voltage.

Also, in FIG.
The second metal plate 8 forms a second capacitor by the second cathode portion 2b and the third cathode portion 2c through the second dielectric 10.
The second capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

In this case, the area of the second metal plate 8 in FIG. 20 may be smaller than the area of the cathode 2 in FIG. 4, in order to effectively contain the electromagnetic radiation noise from the second metal plate 8.

Further, in FIG.
One of the protruding portions of the second metal plate 8 on both sides of the second capacitor is the third electrode portion 5, and the other protruding portion is the fourth electrode portion 6.
Since the distance from the third electrode portion 5 to the fourth electrode portion 6 is longer than the distance from the third electrode portion 5 to the fourth electrode portion 6 in Figure 15, it is expected that noise in a wider frequency band can be efficiently removed.

Furthermore, the third electrode portion 5 and the fourth electrode portion 6 are not only positioned in a point-symmetrical direction from the center point of the second metal plate 8, but can also be flexibly repositioned on opposite sides of the second metal plate 8, and the size and shape of the third electrode portion 5 and the fourth electrode portion 6 can be changed, allowing for flexible response according to the position and situation of the power supply source and power supply destination.

In a distributed constant type noise filter configured as described above, the third electrode portion 5 is connected to the power terminal of the second power supply, and the fourth electrode portion 6 is connected to the second power supply terminal of the electronic component, so that the voltage supplied from the power supply terminal of the second power supply can be supplied to the second power supply terminal of the electronic component while reducing noise in the voltage.

Furthermore, as shown in FIG.
The cathode 2 is connected to a fixed potential such as ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc., and functions as a distributed constant type noise filter with a wide frequency band.

In this manner, the distributed constant type noise filter of the present invention effectively removes noise generated when power is supplied from two or more types of power sources.

Also, by setting the dielectric constant of the first dielectric 9 and the dielectric constant of the second dielectric 10 in FIG. 16(b) to the same value or different values, the capacitance of the first capacitor formed by the first metal plate 7 and the capacitance of the second capacitor formed by the second metal plate 8 can be changed, and it is also possible to change the impedance characteristics at each frequency.

Furthermore, in FIG. 16(a), consider connecting the first electrode portion 3 and the third electrode portion 5 to the power terminal of the same power source, and connecting the second electrode portion 4 and the fourth electrode portion 6 to the power terminal of the same voltage of the same electronic component.

In this case, a capacitor is constructed having the combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8. Furthermore, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 different values, it is possible to obtain further improved impedance characteristics at a plurality of specific frequencies, for example.

Next, we will explain the case where the capacitor formation portion of the present invention is rectangular rather than hexagonal, and where the electrode portions of the metal plate are present in the same layer.

Figure 21 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 21(a) is a top view and Figure 21(b) is a cross-sectional view taken along line J-J of Figure 21(a).

Figure 22 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 22(a) is a top view and Figure 22(b) is a cross-sectional view taken along line K-K of Figure 22(a).

Figure 23 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 23(a) is a top view and Figure 23(b) is a cross-sectional view taken along the line L-L of Figure 23(a).

Figure 13 is a top view of the cathode and cathode terminal in one embodiment of the present invention. In Figure 13, there is a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a rectangular shape.

FIG. 24 is a top view of a first metal plate, a first electrode portion, a second electrode portion, a second metal plate, a third electrode portion, and a fourth electrode portion in one embodiment of the present invention;
A first metal plate 7, a first electrode portion 3, and a second electrode portion 4,
The sensor includes a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6,
The first electrode portion 3 and the second electrode portion 4 are positioned on the same straight line, and the first metal plate 7 has a rectangular shape.
The third electrode portion 5 and the fourth electrode portion 6 are positioned on the same straight line, and the second metal plate 8 has a rectangular shape.

In this case, the first metal plate 7 and the second metal plate 8 do not need to be identical in thickness, and it is desirable that the distance between the first metal plate 7 and the second metal plate is at least 10 times the thickness of the thicker of the first metal plate 7 and the second metal plate, in order to prevent mutual electromagnetic influence between the first metal plate 7 and the second metal plate.

In the top view of FIG. 21(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

In addition, in the cross-sectional view of FIG.
The cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

Next, in the top view of FIG. 22( a ), the distributed constant type noise filter of the present invention has a capacitor-forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first metal plate 7 has a first electrode portion 3 at one end thereof, and a second electrode portion 4 at the other end thereof.

Next, in the top view of FIG. 23(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

Furthermore, in the cross-sectional view of FIG.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second metal plate 8 has a third electrode portion 5 at one end thereof, and a fourth electrode portion 6 at the other end thereof.

Here, in FIG.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.
Also, in FIG.
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

Here, one of the portions of the first metal plate 7 that protrude outward from both sides forming the first capacitor is the first electrode portion 3, and the other portion is the second electrode portion 4.
One of the portions of the second metal plate 8 that protrude outward from both sides forming the second capacitor is the third electrode portion 5 , and the other portion is the fourth electrode portion 6 .

In the distributed constant type noise filter having such a configuration, the first electrode portion 3 is connected to the power supply terminal of the first power supply, and the second electrode portion 4 is connected to the first power supply terminal of the electronic component, so that it is possible to supply the voltage supplied from the power supply terminal of the first power supply to the first power supply terminal of the electronic component while reducing noise in the voltage.
Furthermore, by connecting the third electrode portion 5 to the power supply terminal of the second power source and connecting the fourth electrode portion 6 to the second power supply terminal of the electronic component, it is possible to supply the voltage supplied from the power supply terminal of the second power source to the second power supply terminal of the electronic component while reducing noise in the voltage.

Furthermore, as shown in FIG.
The cathode 2 is connected to a fixed potential such as ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc., and functions as a distributed constant type noise filter with a wide frequency band.

In this manner, the distributed constant type noise filter of the present invention effectively removes noise generated when power is supplied from two or more types of power sources.

In this case, in FIG. 21(a), consider that the first electrode portion 3 and the third electrode portion 5 are connected to the power terminal of the same power source, and the second electrode portion 4 and the fourth electrode portion 6 are connected to the power terminal of the same voltage of the same electronic component.

At this time, a capacitor is formed having a combined capacitance of the first capacitor made of the first metal plate 7 and the second capacitor made of the second metal plate 8, making it possible to obtain improved impedance characteristics at each frequency.

Next, FIG. 25 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.

In FIG. 25, the first metal plate 7 has a first electrode portion 3 on one side and a second electrode portion 4 on the other side.

In this case, the first metal plate 7 forming the distributed constant type noise filter can be formed so that the lengths of both short sides are different.

Here, the length of the long short side at one end of the first metal plate 7 is W2, and the length of the short short side at the other end is W3, so that the shape of the first metal plate 7 is trapezoidal.

Furthermore, of the two electrode portions protruding from the two short sides of the first metal plate 7, a power terminal of a power source is connected to the first electrode portion 3 protruding from the longer short side,
Of the two electrode portions protruding from both short sides of the first metal plate 7, the second electrode portion 4 protruding from the shorter short side is connected to a power supply terminal of an electronic component such as an LSI.

At this time, the impedance on the longer short side of the first metal plate 7 will be smaller than the impedance on the shorter short side because the line width is wider.

Generally, the impedance of the power supply side is low and the impedance of the power supply side, such as the power terminal of an LSI, is high. Therefore, by having a trapezoidal shape like the first metal plate 7, the impedance of the load side to which the LSI or the like is connected is high. By matching the impedance, electrical noise can be easily guided to the distributed constant type noise filter of the present invention and attenuated, and noise over a wider frequency band can be efficiently removed.

This embodiment can also be applied to the second metal plate, and the same effect can be expected.

Next, FIG. 26 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.

In FIG. 26, the first metal plate 7 has a first electrode portion 3 on one side and a second electrode portion 4 on the other side.

As shown in FIG. 26, the shape of the first metal plate 7 that forms the distributed constant type noise filter has a narrowed region almost in the center.

At this time, one or more notches are provided on the side of the long side of the first metal plate 7, and an area of length W4 is formed such that W1 > W4, where W1 is the length of both short sides of the first metal plate 7.

Furthermore, the lengths of both short sides of the first metal plate 7 do not have to be equal; it is sufficient that W4 is smaller than the length of at least one of the short sides of the first metal plate 7.

In this case, by forming one or more notches on the side of the long side of the first metal plate 7, an impedance difference is generated within the distributed constant circuit forming portion, and the impedance of the narrowed region of the first metal plate 7 becomes smaller than the impedance of the other parts of the first metal plate 7, which is expected to efficiently remove noise over a wider frequency band.

This embodiment can also be applied to the second metal plate, and the same effect can be expected.

Next, FIG. 27 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.

In FIG. 27, the first metal plate 7 has a first electrode portion 3 on one side and a second electrode portion 4 on the other side.

As shown in FIG. 27, the shape of the first metal plate 7 forming the distributed constant type noise filter has one or more notches formed on the long side, and the first metal plate 7 itself has a bent zigzag shape.

In this case, by applying a zigzag shape, which has one or more bent shapes such as a meandering shape, to the first metal plate 7, the line length of the transmission line of the first metal plate 7, i.e., the length in the long side direction of the distributed constant circuit forming portion, is increased, and it is expected that noise in a wider frequency band can be efficiently removed.

This embodiment can also be applied to the second metal plate, and the same effect can be expected.

Next, FIG. 28 is a top view of a first metal plate, a first electrode portion, a second electrode portion, a second metal plate, a third electrode portion, and a fourth electrode portion in one embodiment of the present invention.

In FIG. 28, a first metal plate 7 has a first electrode portion 3 on one side and a second electrode portion 4 on the other side.
The second metal plate 8 has a third electrode portion 5 on one side and a fourth electrode portion 6 on the other side.

Here, as shown in FIG. 28, the shape of the first metal plate 7 forming the distributed constant type noise filter has a recessed region and a protruding region, and the shape of the second metal plate 8 is such that it does not come into contact with these regions but maintains a distance from them, and has a recessed region and a protruding region.

In this example, in FIG. 28, the recessed and protruding regions of the first metal plate 7 and the second metal plate 8 are semicircular in shape, but they may be other shapes, such as polygonal, and the areas of the recessed and protruding regions may be different.

At this time, the impedance of the recessed region of the first metal plate 7 is smaller than the impedance of the protruding region, and similarly, the impedance of the recessed region of the second metal plate 8 is smaller than the impedance of the protruding region, so it is expected that noise over a wider frequency band can be efficiently removed.

Next, Figure 29 shows a top view and a cross-sectional view of one embodiment of the present invention.

In the top view of FIG. 29(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

In addition, in the cross-sectional view of FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, a seventh cathode portion 2g, and an eighth cathode portion 2h.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the second dielectric 10,
The first metal plate 7 and the second metal plate 8 are separated by an eighth cathode portion 2h,
The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g, and are connected at the center by the eighth cathode portion 2h.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

Thus, in Figure 29(b), compared to the case of Figure 21(b), the first metal plate 7 and the second metal plate 8 are separated by the eighth cathode portion 2h, which makes it possible to effectively separate the first capacitor formed from the first metal plate 7 and the second capacitor formed from the second metal plate 8 without causing electromagnetic noise to overlap.

Next, Figure 30 shows a top view and a cross-sectional view of one embodiment of the present invention.

In the top view of FIG. 30(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, and a fourth electrode portion 6.

In addition, in the cross-sectional view of FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g,
the capacitor formation portion includes a first capacitor and a second capacitor;
The end of the cathode 2 does not have a cathode terminal.

As described above, in FIG. 30(b), as compared to the case of FIG. 21(b), there is no cathode terminal at the end of the cathode, so that it is possible to reduce the mounting area when mounting on a printed wiring board or the like. Also, by arranging solder balls such as BGA on the bottom surface of the first cathode portion 2a, it is possible to easily mount the first cathode portion 2a to a metal terminal of a printed wiring board.

Next, Figure 31 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 31(a) is a top view and Figure 31(b) is a cross-sectional view taken along line O-O of Figure 31(a).

In the top view of FIG. 31(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a fifth electrode portion 19, a sixth electrode portion 20, a first cathode terminal 11, and a second cathode terminal 12.

In addition, in the cross-sectional view of FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, a seventh cathode portion 2g, a ninth cathode portion 2i, a tenth cathode portion 2j, and an eleventh cathode portion 2k,
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
The third metal plate 21 forms a third capacitor with the third cathode portion 2c and the ninth cathode portion 2i via the fourth dielectric 22,
The third cathode portion 2c and the ninth cathode portion 2i are connected by the tenth cathode portion 2j and the eleventh cathode portion 2k.
the capacitor formation portion includes a first capacitor, a second capacitor, and a third capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

In addition, in FIG. 31, the structure of the first capacitor formed by the first metal plate 7, the second capacitor formed by the second metal plate 8, and the third capacitor formed by the third metal plate 21 is the same as that in FIG. 1 to FIG. 6, and each capacitor forms a distributed constant type noise filter.

As explained in FIG. 31 , by changing the polygon in FIG. 1( a ) from a hexagon to an octagon and increasing the number of capacitor layers in FIG. 1( b ) from two to three, it becomes possible for the distributed constant type noise filter of the present invention to effectively remove noise when power is supplied from three types of power sources.

In addition, in FIG. 31(a) , the case where the capacitor forming portion 1 and the cathode 2 are octagonal has been described, but it is also possible to make them polygonal with more sides than an octagon. Furthermore, by increasing the number of layers of the capacitor in FIG. 31(b) , it is also possible to form even more capacitors made of metal plates and effectively eliminate noise during power supply for even more types of power sources.

Next, Figure 32 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 32(a) is a top view and Figure 32(b) is a cross-sectional view taken along line P-P of Figure 32(a).

Furthermore, Figure 33 shows a top view and a cross-sectional view of one embodiment of the present invention, where Figure 33(a) is a top view and Figure 33(b) is a cross-sectional view taken along line Q-Q of Figure 33(a).

In the top view of FIG. 32(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, a second cathode terminal 12, a third cathode terminal 23, and a fourth cathode terminal 24.

In addition, in the cross-sectional view of FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

In addition, in the top view of FIG. 33(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, a second cathode terminal 12, a third cathode terminal 23, and a fourth cathode terminal 24.

In addition, in the cross-sectional view of FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g.
The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10,
The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f.
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a third cathode terminal 23 at one end thereof, and a fourth cathode terminal 24 at the other end thereof.

The structure of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8 is the same as that shown in FIG. 31, and each capacitor forms a distributed constant type noise filter.

In this case, as shown in Figures 32(a) and 33(a), by providing four cathode terminals, namely, the first cathode terminal 11, the second cathode terminal 12, the third cathode terminal 23 and the fourth cathode terminal 24, in four directions, it is possible to further stabilize the cathode potential, and the characteristics of the distributed constant type noise filter will also be stabilized.

Next, FIG. 34 is a top view of the cathode and cathode terminal in one embodiment of the present invention. In FIG. 34, the structure in FIG. 31 has a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has an octagonal shape.

Next, FIG. 35 is a top view of the cathode and cathode terminal in one embodiment of the present invention. In FIG. 35, the structure in FIG. 32 and FIG. 33 has a cathode 2, a first cathode terminal 11, a second cathode terminal 12, a third cathode terminal 23, and a fourth cathode terminal 24, and the cathode 2 has an octagonal shape.

Next, FIG. 36 is a top view of the first metal plate, first electrode portion, and second electrode portion in one embodiment of the present invention. In FIG. 36, it has the first metal plate 7, first electrode portion 3, and second electrode portion 4 in the structure of FIGS. 31 to 33, and the first metal plate has an octagonal shape.

FIG. 36 shows a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.
In the structure of FIGS. 31 to 33, the second metal plate, the third electrode portion, and the fourth electrode portion may have a structure equivalent to that of FIG. 36.
Moreover, the top view of the third metal plate, the fifth electrode portion, and the sixth electrode portion in the structure of FIG. 31 can also have a structure equivalent to that in FIG.

Next, FIG. 37 is a top view of the first metal plate, first electrode portion, and second electrode portion in one embodiment of the present invention. In FIG. 37, it has the first metal plate 7, first electrode portion 3, and second electrode portion 4 in the structure of FIGS. 31 to 33, and the first metal plate has a rectangular shape.

FIG. 37 shows a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.
In the structure of FIGS. 31 to 33, the second metal plate, the third electrode portion, and the fourth electrode portion may have a structure equivalent to that of FIG. 36.
Moreover, the top view of the third metal plate, the fifth electrode portion, and the sixth electrode portion in the structure of FIG. 31 can also have a structure equivalent to that in FIG.

Next, Figure 38 is a cross-sectional view of the cathode partition in one embodiment of the present invention.

In FIG. 29(b), the first metal plate 7 and the second metal plate 8 are separated by the eighth cathode portion 2h. In FIG. 38(a),
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second cathode portion 2b has a first cathode partition portion 25 on the first dielectric 9 side,
The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g,
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

At this time, the first cathode partition 25 can effectively separate the first capacitor formed from the first metal plate 7 and the second capacitor formed from the second metal plate 8 without causing electromagnetic noise to overlap between them.

Also, in FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second cathode portion 2b has a first cathode partition portion 25 on the first dielectric 9 side,
The first cathode portion 2a has a second cathode partition portion 26 on the first dielectric 9 side,
The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g,
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

In this case, when the direction of the first cathode terminal 11 and the second cathode terminal 12 is the X-axis direction, the first cathode partition 25 and the second cathode partition 26 are arranged at different positions in the X-axis direction, and the first capacitor composed of the first metal plate 7 and the second capacitor composed of the second metal plate 8 can be effectively separated without superimposing electromagnetic noise between them.

In this case, the effect is high even if the positional accuracy for generating the first cathode partition 25 and the second cathode partition 26 in the X-axis direction is not as precise, which further simplifies manufacturing.

Also, in FIG.
The cathode 2 is composed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g.
The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9,
The second cathode portion 2b has a first cathode partition portion 25 on the first dielectric 9 side,
The first cathode portion 2a has a second cathode partition portion 26 on the first dielectric 9 side,
The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g,
the capacitor formation portion includes a first capacitor and a second capacitor;
The cathode 2 has a first cathode terminal 11 at one end thereof, and a second cathode terminal 12 at the other end thereof.

In this case, when the direction of the first cathode terminal 11 and the second cathode terminal 12 is the X-axis direction, the first cathode partition 25 and the second cathode partition 26 are arranged at the same position in the X-axis direction, and the first capacitor composed of the first metal plate 7 and the second capacitor composed of the second metal plate 8 can be effectively separated without superimposing electromagnetic noise between them.

Furthermore, the scope of application of the distributed constant type noise filter of the present invention is such that it can be mounted on a conventional printed wiring board, but it can also be mounted on an LSI or chiplet.

As described above, the distributed constant type noise filter of the present invention has been described by giving examples.
A distributed constant type noise filter that can be connected to two power sources,
a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction;
a second capacitor section that is stacked on the first capacitor section, is disposed between the second cathode section and the third cathode section via a dielectric, and has a second metal plate extending in the second direction;
the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction,
the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the second direction,
the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply;
The first direction and the second direction are characterized by intersecting each other at a predetermined angle, so that noise from two or more types of power sources can be effectively removed, and when decoupling the power sources of an LSI that operates at high speed and requires two or more types of power sources, it is no longer necessary to mount a plurality of different types of capacitors, for example, aluminum electrolytic capacitors, tantalum capacitors, ceramic capacitors, and other different types of capacitors with different self-resonant frequencies, and it becomes possible to handle the situation with fewer components, which leads to a reduction in the number of components, a reduction in component area, and a reduction in the cost and time of component mounting, thereby contributing to the IT industry and, further, to a reduction in CO2 emissions, thereby contributing to the SDGs.

In the distributed constant type noise filter of the present invention,
Since the technology can effectively remove noise from two or more types of power sources, when decoupling the power sources of LSIs that operate at high speed and require two or more types of power sources, it is no longer necessary to mount multiple types of capacitors, for example, multiple different types of capacitors such as aluminum electrolytic capacitors, tantalum capacitors, and ceramic capacitors with different self-resonant frequencies, and it becomes possible to handle the situation with fewer components, which leads to a reduction in the number of components, a reduction in component area, and a reduction in the cost and time of component mounting, thereby contributing to the IT industry and, further, to a reduction in CO2 emissions, thereby contributing to the SDGs.

1...capacitor forming portion 2...cathode 2a...first cathode portion 2b...second cathode portion 2c...third cathode portion 2d...fourth cathode portion 2e...fifth cathode portion 2f...sixth cathode portion 2g...seventh cathode portion 2h...eighth cathode portion 2i...ninth cathode portion 2j...tenth cathode portion 2k...eleventh cathode portion 3...first electrode portion 4...second electrode portion 5...third electrode portion 6...fourth electrode portion 7...first metal plate 8...second metal plate 9...first dielectric 10... second dielectric 11... first cathode terminal 12... second cathode terminal 13... metal plate 14... oxide coating 15... solid electrolyte layer such as conductive polymer 16... graphite and silver paste layer 17... third dielectric 18... metal plate at GND potential 19... fifth electrode portion 20... sixth electrode portion 21... third metal plate 22... fourth dielectric 23... third cathode terminal 24... fourth cathode terminal 25... first cathode partition portion 26... second cathode partition portion

Claims (9)

A distributed constant type noise filter that can be connected to two power sources,
a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction;
a second capacitor section that is stacked on the first capacitor section, is disposed between the second cathode section and the third cathode section via a dielectric, and has a second metal plate extending in the second direction;
the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction,
the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the second direction,
the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply;
The distributed constant type noise filter, wherein the first direction and the second direction intersect with each other at a predetermined angle.
2. The distributed constant type noise filter according to claim 1, wherein the first cathode portion and the second cathode portion are connected to each other through a fifth cathode portion.
2. The distributed constant type noise filter according to claim 1, wherein the first cathode portion has a solder ball on a bottom surface thereof.
2. The distributed constant type noise filter according to claim 1, wherein a surface of the first metal plate is included in the surfaces of the first cathode portion and the second cathode portion when viewed from above.
2. The distributed constant type noise filter according to claim 1, wherein the first cathode portion, the second cathode portion and the third cathode portion have a rectangular shape.
2. The distributed constant type noise filter according to claim 1, wherein the first cathode portion, the second cathode portion and the third cathode portion have a hexagonal shape.
2. The distributed constant type noise filter according to claim 1, wherein the first cathode portion, the second cathode portion and the third cathode portion have an elliptical shape.
A distributed constant type noise filter that can be connected to two power sources,
a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction;
a first cathode portion, a second cathode portion, and a second capacitor portion disposed between the first cathode portion and the second cathode portion via a dielectric and having a second metal plate extending in a first direction;
the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction,
the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the first direction,
the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply;
a protrusion from a first cathode portion is provided between the first metal plate and the second metal plate on the dielectric side of the first cathode portion.
9. The distributed constant type noise filter according to claim 8, wherein a protrusion from the second cathode portion is provided between the first metal plate and the second metal plate on the dielectric side of the second cathode portion.