JPH07183703A - Dielectric resonator device - Google Patents

Abstract

PURPOSE:To provide a dielectric resonator device which makes it easy to form various electrode patterns and is made low-cost and small-sized and is provided with resonance electrodes like strip lines. CONSTITUTION:Resonance electrodes 12a, 12b, 12c, and 12d like strip lines are formed on face of a circuit board 1, and a dielectric substrate 2 whose outside faces a ground electrode 21 is formed on is joined to the circuit board 1. Consequently, the dielectric resonator device is easily obtained and it has signal input/output electrodes pulled out easily and is made small at low cost because of the single dielectric substrate and is superior in characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator device having a stripline-shaped resonance electrode and used for, for example, a microwave band transmission line, a filter, or a microwave integrated circuit using them. Regarding

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a state in which a conventional so-called triplate type stripline filter having a two-layer structure is mounted on a circuit board. In FIG. 7, 3,
Reference numerals 4 are dielectric substrates, respectively. These two dielectric substrates are laminated to form one stripline filter,
This is surface-mounted on the surface of the circuit board 1. 8 is an exploded perspective view showing a state in which the dielectric substrate 4 in FIG. 7 is separated from the dielectric substrate 3, and FIG. 9 is a cross-sectional view of the YY portion in FIG. As shown in FIG. 8 and FIG. 9, stripline resonant electrodes 32a are formed on the upper surface of the dielectric substrate 3,
32b, 32c, 32d and signal input / output electrodes 33, 3
4 is formed, and a signal input / output electrode and a ground electrode 31 continuous with the signal input / output electrodes 33 and 34 are formed from the side surface to the bottom surface. On the other hand, a ground electrode 41 is formed on the upper surface and a predetermined side surface of the dielectric substrate 4 in the figure. Transmission lines 15 and 16 and a ground electrode 11 are formed on the circuit board 1.

The stripline filter composed of two dielectric substrates is connected to the transmission lines 15 and 16 on the circuit board through the signal input / output electrodes 33 and 34 formed from the side surface to the bottom surface. It

[0004]

However, in such a conventional stripline filter, in order to connect the signal input / output electrodes to the transmission line on the circuit board, the side surface of the dielectric substrate forming the stripline filter is arranged. Lead out the signal input / output electrode via the through hole in the lower dielectric substrate, and lead the signal input / output electrode through the through hole to the bottom surface of the dielectric substrate. I was trying to connect to. Therefore, the number of manufacturing processes is large, which is a factor of high cost. As it is not necessary to lead out the signal input / output electrodes from the dielectric substrate onto the circuit board, the stripline filter is directly formed on the circuit board to integrally form the stripline filter on the circuit board. It is possible to do so, but the electromagnetic field leakage from the resonance electrode portion is large, so that it has an external influence and is easily influenced by the outside. Moreover, the relative permittivity εr of a general circuit board is as small as about 4 to 6, and there is a problem in that it is larger than the conventional stripline filter.

An object of the present invention is to solve the above-mentioned problems, to facilitate the formation of various electrode patterns, and to reduce the cost and the size of the dielectric resonator device having a stripline resonance electrode. To provide.

[0006]

A dielectric resonator device according to a first aspect of the present invention is a stripline resonance electrode on one surface of a circuit board on which various conductor patterns are formed and electronic components are mounted. The dielectric resonator device according to claim 2 of the present invention is formed by bonding a dielectric substrate on which a ground electrode is formed at a predetermined position on the outer surface to a region where the resonance electrode is formed on the circuit board. A ground electrode is formed on the other surface of the circuit board facing the area where the resonance electrode is formed.

A dielectric resonator device according to a third aspect of the present invention comprises stripline resonance electrodes formed on the surface of the dielectric substrate facing the circuit board according to the first or second aspect.

According to a fourth aspect of the present invention, there is provided a dielectric resonator device in which a ground electrode is formed around a region where the resonance electrode is formed on the circuit board according to the first, second or third aspect, and the dielectric substrate is provided. A ground electrode extending from the side surface of the dielectric substrate is formed around the surface of the dielectric substrate facing the circuit board, and the ground electrode of the dielectric substrate is connected to the ground electrode on the circuit board.

According to a fifth aspect of the present invention, a dielectric resonator device has signal input / output electrodes of the resonance electrodes provided on the circuit board according to the first, second, third or fourth aspect,
In the dielectric substrate, a transmission line continuous with the signal input / output electrode or a portion where a ground electrode is not formed is provided near the signal input / output electrode.

[0010]

In the dielectric resonator device according to the first aspect of the invention, stripline resonance electrodes are formed on one surface of a circuit board on which various conductor patterns are formed and electronic components are mounted, and a predetermined outer surface is formed. A dielectric substrate having a ground electrode formed at a location is joined to the resonance electrode forming region on the circuit board. Due to the configuration of the stripline resonance electrodes on the circuit board and the dielectric substrate, the component acts as a stripline filter, for example. Also,
Since the ground electrode is formed at a predetermined position on the outer surface of the dielectric substrate, the electromagnetic field does not leak to the outside from the ground electrode and is not affected by the outside. Moreover, generally, by using a dielectric substrate having a relative permittivity larger than that of the circuit substrate, the formation area of the resonance electrode can be small, and a small dielectric resonator device can be formed on the circuit substrate.

In the dielectric resonator device according to the second aspect, the ground electrode is formed on the other surface of the circuit board facing the area where the resonance electrode is formed. Therefore, even with the circuit board alone, there is no electromagnetic field leakage on the back surface of the circuit board,
There is no mutual influence with the outside.

In a dielectric resonator device according to a third aspect of the present invention, stripline resonance electrodes are formed on the surface of the dielectric substrate facing the circuit board. As a result, the bondability with the resonance electrode on the circuit board is improved, the air layer is eliminated, and the disturbance of the electromagnetic field is reduced, and a dielectric resonator device with stable characteristics can be obtained.

In the dielectric resonator device according to the fourth aspect of the present invention, the ground electrode is formed around the resonance electrode forming region on the circuit board, and the dielectric material is formed around the surface of the dielectric substrate facing the circuit board. A ground electrode extending from the side surface of the substrate is formed, and the ground electrode of the dielectric substrate is connected to the ground electrode on the circuit board. With this configuration, there is no electromagnetic field leakage on the side surface of the dielectric substrate,
There is no mutual influence with the outside through the side surface of the dielectric substrate.

In the dielectric resonator device according to a fifth aspect of the present invention, the signal input / output electrode of the resonance electrode is provided on the circuit board, and the transmission line or the signal input continuous with the signal input / output electrode on the dielectric board. The ground electrode non-formation portion is provided at a position close to the output electrode. Therefore, in the state where the dielectric substrate is joined to the circuit board, the signal input / output conductor formed on the circuit board or the transmission line continuous to the conductor is led out without contacting the ground electrode of the dielectric substrate.

[0015]

1 to 4 show the structure of a dielectric resonator device according to a first embodiment of the present invention.

FIG. 1 is an external perspective view. 1 in FIG.
Is a circuit board, and a part thereof is shown in the drawing. Reference numeral 2 denotes a dielectric substrate, which is bonded to a predetermined location on the circuit board 1. Ground electrodes 11 are formed on the upper surface, side surfaces, and lower surface of the circuit board 1 respectively, and transmission lines 15 and 16 separated from the ground electrodes are formed at predetermined locations on the upper surface.
Is formed. As will be described later, these two transmission lines 15 and 16 are used as the signal input / output transmission lines of the stripline filter. Although the ground electrode 21 is formed on the outer surface of the dielectric substrate 2, the ground electrode non-formation portion 24 is provided at a position close to the transmission line 16 and the like.

FIG. 2 is a perspective view showing a state in which the dielectric substrate 2 is separated from the circuit board 1 in FIG. 1 or a state before the dielectric substrate 2 is bonded to the circuit board 1. Further, FIG. 3 is a perspective view of the dielectric substrate shown in FIG. The circuit board 1 is a board on the surface of which an electrode pattern is formed using ceramic or glass epoxy as an element body. As shown in the figure, on the circuit board 1, there are stripline resonance electrodes 12a, 12b, 12
c and 12d are formed, signal input / output electrodes 13 and 14 are provided on the resonance electrodes 12a and 12d, respectively, and transmission lines 15 and 16 are provided continuously to the signal input / output electrodes 13 and 14, respectively. The dielectric substrate 2 is bonded to the resonance electrode forming region indicated by A on the circuit board. Since the ground electrode 21 extending from the side surface is formed around the surface of the dielectric substrate facing the circuit board, the ground electrode 21 formed on the outer surface of the dielectric substrate is bonded to the ground electrode 11 on the circuit board. It
At that time, the transmission lines 15 and 16 are insulated from the ground electrode by the ground electrode non-forming portions 23 and 24 provided on the dielectric substrate.

When the dielectric substrate is bonded to the circuit board, an inorganic conductive bonding agent such as silver paste is applied to either or both of the various electrodes on the circuit board and the various electrodes on the dielectric substrate side. Is applied and baked in a bonded state. When the circuit board is not a ceramic board but a glass / epoxy board or the like, solder paste (cream solder) is applied to the electrode surfaces, and the electrodes are joined by the reflow soldering method. In any case, it is carried out at the same time as the surface mounting of another electronic component on the circuit board, or as a separate step as necessary.

FIG. 4 is a sectional view of the YY portion in FIG. 1 (the YY portion in FIG. 2 on the circuit board). In FIG. 4, 10 is a circuit board element body, and 20 is a dielectric substrate element body. In this way, the stripline resonance electrodes 12a, 12b, 1 which are in contact with the dielectric substrate body 20 are formed.
2c, 12d, the earth electrode 21 on the outer surface of the dielectric substrate and the earth electrode 11 on the bottom surface of the circuit board constitute a so-called triplate-type stripline filter.

Next, the structure of the dielectric resonator device of the second embodiment is shown in FIGS. The shape of the electrode pattern on the circuit board side which constitutes the dielectric resonator device according to the second embodiment is the same as that shown in FIG.

FIG. 5 is a perspective view of the dielectric substrate as seen from the lower front side to the diagonally upper front side. As is clear from comparison with FIG. 3 shown in the first embodiment, stripline resonance electrodes 22a, 22 are formed on the surface of the dielectric substrate facing the circuit board.
b, 22c and 22d are formed. These resonant electrodes are in mirror symmetry with the resonant electrodes formed on the circuit board. FIG. 6 is a cross-sectional view of the dielectric resonator device configured as described above, and is a cross-sectional view of a portion corresponding to FIG. 4 shown as the first embodiment. In this way, by joining the dielectric substrate to the electrode formation region of the circuit board, the resonant electrodes and the ground electrodes are joined to each other to form a dielectric resonator device. Thus, not only between the resonance electrodes 22a, 22b, 22c, 22d on the dielectric substrate side and the dielectric substrate body 20, but also these resonance electrodes and the resonance electrodes 12a, 12b, 12c, 12d on the circuit board side. An air layer is not formed between them, and a dielectric resonator device that functions as a stripline filter with stable characteristics is configured.

In any of the embodiments described above, the characteristics of the stripline filter are that, if the pattern of the resonance electrode is constant, the relative permittivity of the dielectric substrate serves as a parameter, and the center frequency and Bandwidth changes.
Therefore, by selectively using several types of dielectric substrates having different relative permittivities, it is possible to configure a stripline filter having a plurality of types of predetermined bandpass characteristics.

Although the interdigital resonance electrode is formed in the embodiment, it may be a combline type.

[0024]

According to the present invention, the following effects can be obtained.

Since it is not necessary to draw out the signal input / output electrode to the side surface of the dielectric substrate or to form the through hole in the dielectric substrate, the manufacturing cost is reduced.

Since a single dielectric substrate is used, the number of parts can be reduced and the cost can be reduced.

Since only a single dielectric substrate is mounted on the circuit board, the height can be reduced.

Compared to the case where the resonance electrode is simply formed on the circuit board, there is no electromagnetic field leakage and the characteristics are stabilized.

Since the dielectric substrate having a large relative permittivity is used, the formation area of the resonance electrode on the circuit board is downsized, and the size is reduced as a whole.

It is possible to set / change the characteristics by selecting the relative permittivity of the dielectric substrate mounted on the circuit board.

[Brief description of drawings]

FIG. 1 is an external perspective view of a dielectric resonator device according to a first embodiment.

FIG. 2 is an exploded perspective view of the dielectric resonator device shown in FIG.

FIG. 3 is a perspective view of the dielectric substrate shown in FIG. 2 as viewed from the front lower side to the front diagonally upper side.

FIG. 4 is a cross-sectional view of a YY portion in FIG.

FIG. 5 is a perspective view of a dielectric substrate used in the dielectric resonator device according to the second embodiment as seen from the front lower side to the front diagonally upper side.

FIG. 6 is a cross-sectional view of a dielectric resonator device according to a second embodiment.

FIG. 7 is a perspective view showing a state in which a conventional stripline filter is mounted on a circuit board.

8 is a perspective view showing a state in which an upper dielectric substrate is separated from the state shown in FIG.

9 is a cross-sectional view taken along line YY in FIG.

[Explanation of symbols]

 1-Circuit board 2-Dielectric board 10-Circuit board element body 11-Earth electrodes 12a, 12b, 12c, 12d-Resonance electrodes 13, 14-Signal input / output electrodes 15, 16-Transmission line 21-Earth electrodes 22a, 22b , 22c, 22d-resonance electrode 23, 24-ground electrode non-formation part

Claims (5)

[Claims] 1. A dielectric substrate in which a stripline resonance electrode is formed on one surface of a circuit board on which various conductor patterns are formed and electronic components are mounted, and a ground electrode is formed at a predetermined position on the outer surface, A dielectric resonator device formed by bonding to a formation region of the resonance electrode on the circuit board. 2. The dielectric resonator device according to claim 1, wherein a ground electrode is formed on the other surface of the circuit board facing the area where the resonance electrode is formed. 3. The dielectric resonator device according to claim 1, wherein a stripline resonance electrode is formed on a surface of the dielectric substrate facing the circuit board. 4. A ground electrode is formed on the circuit board around a region where the resonance electrode is formed, and a ground electrode extends from a side surface of the dielectric substrate around a surface of the dielectric substrate facing the circuit board. 4. The dielectric resonator device according to claim 1, wherein the ground electrode of the dielectric substrate is connected to the ground electrode on the circuit substrate while forming the above. 5. A signal input / output electrode of the resonance electrode is provided on the circuit board, and a ground electrode is provided on a transmission line continuous to the signal input / output electrode on the dielectric board or at a position close to the signal input / output electrode. 5. The dielectric resonator device according to claim 1, further comprising a non-forming portion.