JP2003289203A - Dielectric filter and transmitting/receiving duplexer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitting/receiving duplexer, capable of easily obtaining filter characteristics on transmitting and receiving sides, without much increasing a coupling capacity between an input/output shared electrode and a dielectric resonator. <P>SOLUTION: Both of one ends of a filter 12 on the transmission side and a filter 14 on the reception side with first resonators 12A-12C, 14A-14C, including inner conductors 4 formed in a dielectric block 2 and outer conductors 5 formed on an outer plane of the dielectric block 2 are coupled respectively to a shared electrode 8, the other ends of the filters 12, 14 are coupled respectively to a transmitting signal input electrode 6 and a receiving signal output electrode 7. A second resonator 16, including a inner conductor formed in the dielectric block 2 and the outer electrode 5 formed on the outer plane is placed between the filter 12, 14. The inner conductor of the second resonator 16 is coupled to the shared electrode 8 by a coupling conductor 9 formed on the outer plane of the dielectric block 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter formed by combining a plurality of coaxial dielectric resonators and a duplexer using the same.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
2. Description of the Related Art A duplexer mounted on a wireless device or the like has a function of outputting a transmission signal input from a transmission circuit to an antenna and outputting a reception signal input from the antenna to a reception circuit.

In such a duplexer, for example, Japanese Unexamined Patent Publication No. 10-93305 and Japanese Patent Publication No. 8-512 are available.
As described in Japanese Patent No. 187, a plurality of inner conductors are provided inside a dielectric block, and an outer conductor and electrodes for inputting / outputting signals are provided on the outer surface of the dielectric block as a transmitting side filter and a receiving side filter. A plurality of coaxial dielectric resonators arranged is used.

The input / output common electrode connected to the antenna is
For example, as described in Japanese Patent Application Laid-Open No. 10-93305, on the outer surface of the dielectric block, it is arranged between the in-resonator conductor of the transmitting filter and the in-resonator conductor of the receiving filter which are adjacent to each other. Capacitively coupled to each of the two intracavity conductors. Further, as the input / output common electrode, as described in Japanese Patent Publication No. 8-512187, a dielectric is used so as to be capacitively coupled to an intra-resonator conductor shared by the transmission side filter and the reception side filter. Some are located on the outside of the block.

By the way, in the duplexer as described above, it is necessary to secure a required coupling capacitance between the input / output common electrode and each of the transmitting side filter and the receiving side filter. In particular, in the case of the input / output common electrode of the duplexer, it is commonly used for the two resonators, so that a large capacitance is required. The coupling capacitance is formed between the input / output common electrode and the in-resonator conductor of the transmitting filter adjacent to the common electrode and between the input / output common electrode and the in-resonator conductor of the receiving filter near the common electrode. .

By the way, in recent years, as the demand for miniaturization of the duplexer has increased, the dielectric block forming the dielectric filter has to be miniaturized. With such miniaturization, the characteristic impedance of the resonator of the transmission side filter and the reception side filter decreases, the coupling capacitance between the common electrode and the transmission side filter and the reception side filter becomes insufficient, and the filter characteristic tends to deteriorate. It is in.

In order to solve such a problem, as described in JP-A-10-93305, the distance between the in-resonator conductor and the common electrode is shortened or the area of the common electrode is increased. The lack of binding capacity is prevented. However, it is difficult to sufficiently cope with the further miniaturization of the duplexer required by such a measure.

Therefore, according to the present invention, even if the dielectric block is miniaturized, good characteristics of the transmitting side filter and the receiving side filter can be easily obtained without increasing the coupling capacitance between the input / output common electrode and the dielectric resonator. The purpose is to provide a duplexer that can be obtained.

Further, the present invention provides a dielectric filter which can easily obtain good characteristics even if the dielectric block is downsized without increasing the coupling capacitance between the input / output electrodes and the dielectric resonator. The purpose is to do.

[0010]

According to the present invention, in order to achieve the above object, a first inner conductor formed inside a dielectric block and an outer conductor formed on an outer surface of the dielectric block are provided. A dielectric filter having a plurality of first resonators including: and a plurality of input / output electrodes,
A second resonator including a second inner conductor formed inside the dielectric block and an outer conductor formed on an outer surface of the dielectric block is provided, and the second resonators are adjacent to each other. A dielectric filter disposed between the two first resonators, wherein the second inner conductor of the second resonator is connected to one of the input / output electrodes, Will be provided.

According to the present invention, in order to achieve the above object, a first inner conductor formed inside a first dielectric block and a first outer conductor formed on an outer surface of the first dielectric block. A plurality of first resonators each including a conductor, and
A dielectric filter having a plurality of input / output electrodes, comprising a second inner conductor formed inside a second dielectric block and a second outer conductor formed on an outer surface of the second dielectric block. A second resonator comprising the second resonator is disposed between the two first resonators adjacent to each other, and the first resonator and the second resonator are adjacent to each other. A dielectric filter characterized by comprising coupling means for coupling one another, said coupling means connecting said second inner conductor and one of said input / output electrodes;
Will be provided.

Further, according to the present invention, in order to achieve the above object, a first inner conductor formed inside the first dielectric block and a first outer conductor formed on the outer surface of the first dielectric block. A dielectric filter comprising: a plurality of first resonators each including a conductor; a dielectric coupling member that couples the first resonators to each other; and a plurality of input / output electrodes.
There is provided a second resonator including a second inner conductor formed inside the second dielectric block and a second outer conductor formed on an outer surface of the second dielectric block, and the second resonator. Is disposed between the two first resonators adjacent to each other, and the dielectric coupling member internally includes a first inner surface electrode corresponding to the first inner conductor and a second inner conductor corresponding to the second inner conductor. Two
An inner surface electrode is provided, and the input / output electrode is provided on an outer surface, and the first inner surface electrode and the second inner surface electrode are connected to the corresponding first inner conductor and second inner conductor by a connecting member. And a second inner surface electrode of the coupling member is connected to one of the input / output electrodes.

Further, according to the present invention, in order to achieve the above-mentioned object, a transmission side filter, a reception side filter, a transmission signal input electrode, a reception signal output electrode and a common electrode are provided, and the transmission side filter has One end and one end of the reception side filter are both coupled to the common electrode, the other end of the transmission side filter is coupled to the transmission signal input electrode, and the other end of the reception side filter is the reception signal. The filter on the transmitting side and the filter on the receiving side are coupled to an output electrode, and each include a first inner conductor formed inside a dielectric block and an outer conductor formed on an outer surface of the dielectric block. A duplexer including a plurality of the first resonators, including a second inner conductor formed inside the dielectric block and an outer conductor formed on an outer surface of the dielectric block. That includes a second cavity, said second
A resonator is disposed between the transmission side filter and the reception side filter, and the second inner conductor of the second resonator is connected to the common electrode. Will be provided.

Further, according to the present invention, in order to achieve the above-mentioned object, a transmission side filter, a reception side filter, a transmission signal input electrode, a reception signal output electrode and a common electrode are provided, and the transmission side filter has One end and one end of the reception side filter are both coupled to the common electrode, the other end of the transmission side filter is coupled to the transmission signal input electrode, and the other end of the reception side filter is the reception signal. A first inner conductor formed inside the first dielectric block and a first inner conductor formed on the outer surface of the first dielectric block are respectively coupled to the output electrode. A duplexer comprising a plurality of first resonators including an outer conductor, the second inner conductor formed inside the second dielectric block and the outer surface of the second dielectric block. Was done A second resonator including two outer conductors, the second resonator being disposed between the transmission-side filter and the reception-side filter, the first resonator and the second resonator. There is provided a duplexer comprising coupling means for coupling adjacent ones of the resonators, and the coupling means connects the second inner conductor and the common electrode.

Further, according to the present invention, in order to achieve the above-mentioned object, a transmission side filter, a reception side filter, a transmission signal input electrode, a reception signal output electrode and a common electrode are provided, and the transmission side filter has One end and one end of the reception side filter are both coupled to the common electrode, the other end of the transmission side filter is coupled to the transmission signal input electrode, and the other end of the reception side filter is the reception signal. A first inner conductor formed inside the first dielectric block and a first inner conductor formed on the outer surface of the first dielectric block are respectively coupled to the output electrode. A duplexer comprising a plurality of first resonators including an outer conductor, and having a dielectric coupling member for coupling the first resonators to each other, the interior of the second dielectric block being a duplexer. In shape A second resonator including a second inner conductor formed on the outer surface of the second dielectric block, and the second resonator including the second outer conductor formed on the outer surface of the second dielectric block, the second resonator including the transmitter filter and the receiver. It is placed between the side filter and
The dielectric coupling member includes therein a first inner surface electrode corresponding to the first inner conductor and a second inner surface electrode corresponding to the second inner conductor, and has the transmission signal input electrode, the reception signal output electrode, and the outer surface on the outer surface. A common electrode, wherein the first inner surface electrode and the second inner surface electrode are connected to the corresponding first inner conductor and second inner conductor by a connecting member, and the second inner surface of the coupling member is provided. There is provided a duplexer characterized in that an electrode is connected to the common electrode.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. In the drawings described below, members or portions having equivalent functions are designated by corresponding reference numerals.

FIG. 1 is a schematic perspective view showing a first embodiment of a duplexer according to the present invention.

In FIG. 1, reference numeral 2 is a rectangular parallelepiped dielectric block, and the material of the block 2 is, for example, Ba.
TiO ₃ -based ceramics can be used. A plurality of vertical through holes 3 having a circular cross section are formed in the block 2 in parallel with each other. A conductor film is provided on the inner surface of the through hole 3, and the inner conductor 4 is formed by the conductor film. Further, a conductor film is attached to the outer surface of the four side portions of the dielectric block 2 along the through hole 3 and one outer surface of the through hole 3 to be opened, and the outer conductor 5 is formed by the conductor film. . As a material for the inner conductor 4 and the outer conductor 5, for example, Ag can be used. In this way, the λ / 4 coaxial dielectric resonators 12A, 12B as the first resonator,
12C, 14A, 14B, 14C and a λ / 4 coaxial dielectric resonator 16 as a second resonator are formed. The end surface where the inner conductor 4 and the outer conductor 5 are short-circuited (the lower end surface in FIG. 1) is called the short-circuited end surface, and the end surface where the inner conductor 4 and the outer conductor 5 are not short-circuited (the upper end surface in FIG. 1) is opened. Called the end face. On the open end face, as shown in the drawing, a capacitive electrode 4'consisting of a conductor film connected to each of the inner conductors 4 of the first resonator is formed.

In this embodiment, three resonators 12A, 12B and 12C arranged in parallel in the same direction are used to form a three-stage transmission side filter (transmission band pass filter) 12
Is formed, and three resonators 14A, 14B, and 14C arranged in parallel in the same direction form a three-stage reception-side filter (reception band-pass filter) 14, and the transmission-side filter 12 and The second resonator 16 is arranged in the same direction as the second filter 16 between the receiving filter 14 and the resonator 12C and the resonator 14A.

In this embodiment, all the resonators 12A, 12A
B, 12C, 14A, 14B, 14C and 16 are formed using a single dielectric block 2. That is, in the present embodiment, the dielectric block of the transmitting filter 12, the dielectric block of the receiving filter, and the dielectric block of the second resonator 16 are integrated.

In FIG. 1, a transmission signal input electrode 6 made of a conductor film insulated from the outer conductor 5 is formed on the outer surface of the dielectric block in the vicinity of the resonator 12A at the left end of the transmission side filter 12, and the reception signal is received. The resonator 1 at the right end of the side filter 14
On the outer surface of the dielectric block near 4C, a reception signal output electrode 7 made of a conductor film insulated from the outer conductor 5 is formed. An input / output common electrode 8 made of a conductor film insulated from the outer conductor 5 is formed on the outer surface of the dielectric block near the second resonator 16, and the conductor film insulated from the outer conductor 5 is formed. A connecting conductor 9 is formed to connect the common electrode 8 and the second in-resonator conductor 4. The connection conductor 9
Is a capacitance electrode 4 ′ connected to the inner conductor of the first resonator.
Similarly, it also functions as a capacitance electrode.

FIG. 2 shows an equivalent circuit diagram of the duplexer of the present embodiment. The resonator 12C of the transmission filter 12 is capacitively coupled to the common electrode 8 and the connection conductor 9 connected to the antenna ANT via the capacitance Ci1. The resonator 14A of the receiving filter 14 is capacitively coupled to the common electrode 8 and the connecting conductor 9 via the capacitor Ci2. Transmitter filter 1
The second resonator 12A is capacitively coupled to the transmission signal input electrode 6 connected to the transmitter TX via the capacitance Ci3. The resonator 14C of the reception side filter 14 is capacitively coupled to the reception signal output electrode 7 connected to the receiver RX via the capacitance Ci4.

Z1 is a resonator 12A, 12B, 12C, 1
4A, 14B, 14C and 16 are characteristic impedances, and θ1 to θ6 and θa are the resonators 12A, 12B and 12 respectively.
These are resonance frequencies of C, 14A, 14B, 14C and 16.

Here, for comparison, FIG.
A schematic perspective view of a duplexer having the same configuration as that of the above embodiment except that the resonator 16 is not used is shown, and an equivalent circuit diagram thereof is shown in FIG.

The duplexer of FIGS. 1 and 2 and FIGS.
The best transmission-side filter 12 in the duplexer of
And the characteristics of the receiving-side filter 14 (that is, the antenna ANT terminal portion and the transmitter TX terminal portion or the receiver RX terminal portion have the highest impedance matching in the transmission frequency pass band or the reception frequency pass band, respectively). (For example, 50 [Ω]), a transmission-side filter characteristic has a minimum insertion loss in the transmission frequency pass band and a maximum reflection loss, and a reception-side filter characteristic has a reception frequency pass band in the transmission frequency pass band. The values of the parameters of these circuits (when the insertion loss is minimum and the reflection loss is maximum) are shown in Table 1 below.
Shown in. Incidentally, Z1 = 7.50 [Ω], L1 = 3.70
[NH] and L2 = 7.37 [nH].

[0026]

[Table 1] As can be seen from Table 1, in the case of FIGS. 3 to 4 in which the second resonator 16 is not used, where Ci and Ci2 require 2.40 [pF] and 0.87 [pF], respectively,
In the case of FIGS. 1 and 2 using the second resonator 16, Ci
0.90 [pF] and 0.64 for 1 and Ci2, respectively
[PF] may be used. In particular, Ci1 = 2.
40 [pF] cannot be realized only by increasing the area of the common electrode, extending the common electrode to the open end surface, or forming a slit in the dielectric block.
On the other hand, Ci1 in the case of using the second resonator 16 in FIGS. 1 and 2 has a required capacitance of 0.90 [pF] by appropriately setting the resonance frequency θa of the second resonator 16. And it can be small. Note that such parameters may be set by simulation or trial production so that Ci1 and Ci2 are minimized.

FIG. 5 is a schematic partial perspective view showing a second embodiment of the duplexer according to the present invention. This embodiment is different from the first embodiment only in the structure of the connection conductor 9 that connects the common electrode 8 formed in the dielectric block 2 and the inner conductor 4 of the second resonator 16. In this embodiment, a groove is formed on the open end surface of the dielectric block 2 so as to connect the through hole 3 to the outer surface on which the common electrode 8 is formed, and the connection conductor 9 is formed on the inner surface of the groove. Has been done. According to this embodiment, the same effects as those of the first embodiment can be obtained, and further, the connecting conductor 9 can be formed at the same time when the inner conductor 4 and the outer conductor 5 are formed. There is a manufacturing advantage that there is no need to newly form a connection conductor.

FIG. 14 is a schematic partial perspective view showing a modified example of the second embodiment. In this modification, a recess is formed in the dielectric block 2 at a position corresponding to the inner conductor 4 of the first resonator and the second resonator, and the inner conductor is formed on the bottom surface and the inner side surface of the recess. 4 is formed of a conductor film connected to the conductive film 4. By forming the three-dimensional capacitance electrode 4 "in this way, the coupling capacitance between adjacent resonators can be increased.

FIG. 6 is a schematic perspective view showing a third embodiment of the duplexer according to the present invention.

In this embodiment, all the resonators 12A, 12
B, 12C, 14A, 14B, 14C and 16 are formed by using individual dielectric blocks, and outer conductors are formed on the outer surface of each dielectric block. In FIG. 6, 2
Reference numeral 0 is a wiring board, on the surface of which a transmission side filter 1
2, the receiving filter 14 and the second resonator 16 are surface-mounted. That is, each resonator 12 is formed on the surface of the substrate 20.
A capacitive electrode 123 is formed of a conductive film that constitutes a coupling means for coupling adjacent ones of A, 12B, 12C, 14A, 14B, 14C and 16. The capacitance electrode 123 and the corresponding inner conductor 4 of the resonator are connected to each other by a connecting wire 1
They are connected by 22 and capacitive coupling is formed between adjacent ones of the capacitive electrodes 123. Board 20
Has a transmission signal input electrode 6 formed adjacent to the capacitive electrode 123 connected to the resonator 12A at the left end of the transmission filter 12, and the resonator 1 at the right end of the reception filter 14 is formed.
The reception signal output electrode 7 is formed adjacent to the capacitance electrode 123 connected to 4C. In addition, the substrate 20 has a second
The input / output common electrode 8 is formed in connection with the capacitance electrode 123 connected to the resonator 16.

The present embodiment functions similarly to the first embodiment described above.

FIG. 7 is a schematic exploded perspective view showing a fourth embodiment of the duplexer according to the present invention, and FIG. 8 and FIG.
Is a partial cross-sectional view thereof.

In these figures, 30 is a block-shaped coupling member made of a dielectric material similar to that of the dielectric block 2. The coupling member 30 includes resonators 12A, 12B, 12C, 14A, 14 arranged in the same manner as in the above embodiment.
B, 14C and 16 are arranged so as to face the open end surface of the dielectric block 2. Then, vertical through holes having the same inner diameter are formed corresponding to the through holes 3 of each resonator, and a conductor film is attached to the inner surface of the through holes, whereby the inner surface electrode 34 is formed. Has been done.

In this embodiment, the transmission signal input electrode, the reception signal output electrode, and the common electrode are not formed in the resonator, and the transmission signal input electrode 36, the reception signal output electrode 37, and the reception signal output electrode 37 are formed on the side surface of the coupling member 30. The common electrode 38 is formed. On the upper surface of the coupling member 30, a conductor film (connection conductor) 39 that connects the common electrode 38 and the inner surface electrode 34 corresponding to the second resonator 16 is formed.

40 is a rod-shaped conductive connecting member,
Each resonator 12A, 12B, 12C, 14A, 14B, 1
4C and 16 extend through the inside of the through hole 3 of the dielectric block 2 and the inside of the corresponding through hole of the coupling member 30, whereby the conductor 4 in the resonator and the inner surface electrode 34 of the coupling member.
Are electrically connected, and each resonator and the coupling member 30 are mechanically connected. The connecting member 40 has a shaft portion 40a that is inserted into the through hole 3 of the dielectric block 2 and the through hole of the coupling member 30, and a flange portion 40b that is provided at the center in the vertical direction and has a predetermined thickness. Each resonator is separated from the coupling member 30 by the thickness of the flange portion 40b. Thus, by attaching all resonators to the coupling member 30 by the connecting member 40, the arrangement of all resonators is maintained.

Thus, via the coupling member 30, the resonators 12A to 12C of the transmitting filter 12 are coupled, the resonators 14A to 14C of the receiving filter 14 are coupled, and the resonator 12A of the transmitting filter 12 is transmitted. Coupling with the signal input electrode 36, coupling with the resonator 14C of the receiving filter 14 and the receiving signal output electrode 37, resonator 1 of the transmitting filter 12
2C and the common electrode 38 and the connection conductor 39 are capacitively coupled, the resonator 14A of the reception side filter 14 and the common electrode 38 and the connection conductor 39 are capacitively coupled, and the second resonator 16 and the common electrode 38 are connected. ing.

In FIGS. 8 and 9, reference numeral 20 is a wiring board, on which a duplexer is surface-mounted.
That is, the conductor patterns 22, 23,
25 are formed. The outer conductor 5 is connected to the conductor pattern 22, and the conductor pattern 22 is grounded. The transmission signal input electrode 36 is connected to the conductor pattern 23, and the conductor pattern 23 is connected to the output end (not shown in FIG. 8) of the transmitter. The common electrode 38 is connected to the conductor pattern 25, and the conductor pattern 25 is connected to the antenna (see FIG.
Not shown). Although not shown in FIGS. 8 and 9, similarly, the reception signal output electrode 37 is
It is connected to the conductor pattern on the surface of the substrate connected to the input end of the receiver.

According to this embodiment, the same effect as that of the first embodiment can be obtained, and since the coupling member 30 is used, a larger coupling capacity can be obtained.

It should be noted that in the present embodiment, an integrated dielectric block as shown in FIG. It is also possible to use the input electrode 6, the reception signal output electrode and the common electrode).

10 and 11 are schematic perspective views showing still another mode of the dielectric block used in the duplexer according to the present invention. In the configuration of FIG. 10, the dielectric block 2 of the resonators 12A, 12B and 12C of the transmission side filter 12 is integrated, and the dielectric block 2 of the resonators 14A, 14B and 14C of the reception side filter 14 is integrated. Has been done. Further, in the configuration of FIG. 11, the resonators 12A, 12B and 12C of the transmission side filter 12 and the dielectric block 2 of the second resonator 16 are integrated, and the resonators 14A, 14B and 14C of the reception side filter 14 are integrated. The dielectric block 2 is integrated. In this way, the dielectric blocks can be integrated in a suitable number for a plurality of adjacent resonators. These resonators do not form input / output electrodes on the outer surface when the coupling member 30 is used.

FIG. 12 is a schematic partial perspective view showing the first embodiment of the dielectric filter according to the present invention.

In this embodiment, the dielectric block 2
The three-stage bandpass filter 42 including the first resonators 42A, 42B, and 42C is formed on the upper part, and the trap including the first resonator 43A and the trap including the first resonator 43B are formed. In addition, the dielectric block 2 has a second resonator between the first resonator 42A and the trap 43A.
The resonator 44 is formed, and the second resonator 45 is formed between the first resonator 42C and the trap 43B.

On the outer surface of the dielectric block 2, two input / output electrodes 46 and 47 made of a conductor film insulated from the outer conductor 5 are formed in correspondence with the second resonators 44 and 45. These input / output electrodes 46 and 47 and the second resonator 4
The inner conductors 2 of 4, 45 are connected to the outer conductor 5 by two connecting conductors 48, 49 each made of a conductor film insulated.

In the present embodiment, since the second resonators 44 and 45 are arranged between the bandpass filter 42 and the traps 43A and 43B, the input / output electrodes 46 and 47 and the first resonator 42A are arranged. , 42C and trap 43
Even if the coupling capacitance with A and 43B is small, the second resonator 4
A dielectric filter having good characteristics can be obtained by appropriately setting the resonance frequencies of 4, 45.

The setting of such parameters is performed in the same manner as described in the first embodiment of the duplexer so as to obtain the best filter characteristic by simulation or trial production (that is, the best filter characteristic in the pass band). Impedance matching can be performed in such a manner that the characteristics are good and the insertion loss in the pass band is minimum and the reflection loss is maximum.

FIG. 13 is a schematic partial perspective view showing a second embodiment of the dielectric filter according to the present invention.

This embodiment is different from the embodiment of FIG. 12 in that the coupling member 30 and the connecting member 40 as described in the embodiments of FIGS. 7 to 9 are used. Input / output electrodes 56 and 57 and connection conductors 58 and 59 are formed on the outer surface of the coupling member 30 so as to correspond to the second resonators 44 and 45, respectively. According to this embodiment, the same effect as that of the embodiment of FIG. 12 can be obtained, and since the coupling member 30 is used, a larger coupling capacity can be obtained.

As a modification of the embodiment shown in FIG. 12 or the embodiment shown in FIG. 13, depending on the required filter characteristics, one of the second resonators 44 and 45 is removed, or the first resonator 43A. It is also possible to remove one of the trap and the trap composed of the first resonator 43B.

Further, the dielectric filter according to the present invention uses a plurality of dielectric blocks 2 as described with reference to FIGS. 7 to 11 above and resonates by the coupling means of the mounting form as shown in FIG. It may be a combination of vessels.

In the above embodiments, the inner conductors of all the resonators have the same shape and size. However, in the present invention, the shape and size of each resonator can be appropriately changed as desired, and for example, the shape and size of the transmission side filter and the reception side filter can be different.

[0051]

As described above, according to the present invention, since the second inner conductor of the second resonator is connected to at least one of the input / output electrodes, it is possible to reduce the size of the dielectric block. Good filter characteristics can be easily obtained without increasing the coupling capacitance between the output electrode and the dielectric resonator.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a duplexer according to the present invention.

2 is an equivalent circuit diagram of the duplexer of FIG.

FIG. 3 is a schematic perspective view showing a duplexer for comparison.

FIG. 4 is an equivalent circuit diagram of the duplexer of FIG.

FIG. 5 is a schematic partial perspective view showing a second embodiment of the duplexer according to the present invention.

FIG. 6 is a schematic perspective view showing a third embodiment of the duplexer according to the present invention.

FIG. 7 is a schematic exploded perspective view showing a fourth embodiment of a duplexer according to the present invention.

FIG. 8 is a partial cross-sectional view of FIG.

9 is a partial cross-sectional view of FIG. 7.

FIG. 10 is a schematic perspective view showing still another form of a dielectric block used in the duplexer according to the present invention.

FIG. 11 is a schematic perspective view showing still another form of a dielectric block used in the duplexer according to the present invention.

FIG. 12 is a schematic partial perspective view showing the first embodiment of the dielectric filter according to the present invention.

FIG. 13 is a schematic partial perspective view showing a second embodiment of the dielectric filter according to the present invention.

FIG. 14 is a schematic partial perspective view showing a modified example of the second embodiment of the duplexer according to the present invention.

[Explanation of symbols]

2 Dielectric block 3 through holes 4 Inner conductor 4 ', 4 "capacitance electrode 5 outer conductor 6 Transmission signal input electrode 7 Received signal output electrode 8 Input / output common electrode 9 Connection conductor 12 Transmitter filter 12A, 12B, 12C First resonator 14 Receiver filter 14A, 14B, 14C First resonator 16 Second resonator 20 wiring board 22, 23, 25 conductor pattern 30 block-shaped connecting members 34 Inner surface electrode 36 Transmission signal input electrode 37 Received signal output electrode 38 Input / output common electrode 39 Connection conductor 40 Rod-shaped conductive connecting member 40a shaft 40b Flange part 42 bandpass filter 42A, 42B, 42C 1st resonator 43A, 43B trap 44,45 second resonator 56,57 I / O electrodes 58, 59 Connection conductor 122 connection conductor 123 Capacitance electrode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiko Kitajima             2023, Mugikawa, Okubun, Omine-cho, Mine City, Yamaguchi Prefecture               Ube Electronics Co., Ltd. F-term (reference) 5J006 HA04 HA15 HA18 HA26 JA05                       JA06 JA12 JA31 KA06 KA12                       KA23 LA01 LA03 LA21 LA25                       NA08 NB07 NC02 NF01

Claims (22)

[Claims] 1. A first member formed inside a dielectric block.
A dielectric filter comprising a plurality of first resonators including an inner conductor and an outer conductor formed on an outer surface of the dielectric block, and a plurality of input / output electrodes, the dielectric filter comprising: There is provided a second resonator including a second inner conductor formed inside and an outer conductor formed on an outer surface of the dielectric block, and the second resonator includes two first resonators adjacent to each other. A dielectric filter arranged between resonators, wherein the second inner conductor of the second resonator is connected to one of the input / output electrodes. 2. The second inner conductor is connected to an input / output electrode formed on the outer surface of the dielectric block by a connection conductor formed on the outer surface of the dielectric block. Item 2. The dielectric filter according to item 1. 3. A plurality of first resonators each including a first inner conductor formed inside the first dielectric block and a first outer conductor formed on an outer surface of the first dielectric block, and ,
A dielectric filter having a plurality of input / output electrodes, comprising a second inner conductor formed inside a second dielectric block and a second outer conductor formed on an outer surface of the second dielectric block. A second resonator comprising the second resonator is disposed between the two first resonators adjacent to each other, and the first resonator and the second resonator are adjacent to each other. A dielectric filter, comprising: coupling means for coupling each other, the coupling means connecting the second inner conductor and one of the input / output electrodes. 4. The coupling means has a capacitive electrode connected to each of the first inner conductor and the second inner conductor, and capacitive coupling is formed between adjacent ones of these capacitive electrodes. The input / output electrode is formed by a plurality of the capacitance electrodes.
The dielectric filter according to. 5. A first of at least two said first resonators.
The dielectric block is integrated,
The dielectric filter according to claim 3. 6. The second dielectric block has at least one
The dielectric filter according to any one of claims 3 to 5, wherein the dielectric filter is integrated with a first dielectric block of one of the first resonators. 7. A plurality of first resonators each including a first inner conductor formed inside a first dielectric block and a first outer conductor formed on an outer surface of the first dielectric block; A dielectric filter including a dielectric coupling member for coupling the first resonators to each other and a plurality of input / output electrodes, wherein the second inner conductor and the second inner conductor formed inside a second dielectric block are provided. A second resonator including a second outer conductor formed on the outer surface of the dielectric block, the second resonator being disposed between two first resonators adjacent to each other. The dielectric coupling member includes a first inner surface electrode corresponding to the first inner conductor and a second inner surface electrode corresponding to the second inner conductor, and the input / output electrode on an outer surface, The first inner surface electrode and the second inner surface electrode respectively correspond to the first It is connected by a connecting member and conductor and the second inner conductor, a dielectric filter and the second inner surface electrode of the coupling member, characterized in that it is connected to one of said input and output electrodes. 8. The dielectric filter according to claim 7, wherein the second inner surface electrode is connected to the input / output electrode by a connection conductor formed on the outer surface of the dielectric coupling member. 9. The dielectric according to claim 8, wherein the input / output electrodes other than the input / output electrodes connected to the second inner surface electrode are capacitively coupled to the first inner surface electrode. filter. 10. The dielectric filter according to claim 7, wherein at least two first dielectric blocks of the first resonator are integrated. 11. The dielectric according to claim 7, wherein the second dielectric block is integrated with at least one first dielectric block of the first resonator. Body filter. 12. A transmission side filter, a reception side filter, a transmission signal input electrode, a reception signal output electrode, and a common electrode, and one end of the transmission side filter and one end of the reception side filter are both the common electrode. And the other end of the transmission side filter is connected to the transmission signal input electrode, the other end of the reception side filter is connected to the reception signal output electrode, the transmission side filter and the The reception-side filter includes a plurality of first resonators each including a first inner conductor formed inside the dielectric block and an outer conductor formed on the outer surface of the dielectric block. And a second resonator including a second inner conductor formed inside the dielectric block and an outer conductor formed on the outer surface of the dielectric block, the second resonator being provided. Is said It is disposed between the side filter and the receiving filter, the second inner conductor of the second resonator duplexer, characterized in that connected to the common electrode. 13. The second inner conductor is connected to a common electrode formed on the outer surface of the dielectric block by a connection conductor formed on the outer surface of the dielectric block. The duplexer according to item 12. 14. A transmission side filter, a reception side filter, a transmission signal input electrode, a reception signal output electrode and a common electrode, wherein one end of the transmission side filter and one end of the reception side filter are both the common electrode. And the other end of the transmission side filter is connected to the transmission signal input electrode, the other end of the reception side filter is connected to the reception signal output electrode, the transmission side filter and the The receiving filter includes a plurality of first resonators each including a first inner conductor formed inside the first dielectric block and a first outer conductor formed on an outer surface of the first dielectric block. A duplexer provided with the second resonance, comprising a second inner conductor formed inside the second dielectric block and a second outer conductor formed on an outer surface of the second dielectric block. Equipped with The second resonator is arranged between the transmission side filter and the reception side filter, and includes a coupling means for coupling adjacent ones of the first resonator and the second resonator, The duplexer, wherein the coupling means connects the second inner conductor and the common electrode. 15. The coupling means has a capacitive electrode connected to each of the first inner conductor and the second inner conductor, and capacitive coupling is formed between adjacent ones of these capacitive electrodes. 15. The duplexer according to claim 14, wherein the input / output electrodes are formed by a plurality of the capacitance electrodes. 16. The duplexer according to claim 14, wherein at least two first dielectric blocks of the first resonator are integrated. 17. The transceiver according to claim 14, wherein the second dielectric block is integrated with at least one first dielectric block of the first resonator. Shared device. 18. A transmission side filter, a reception side filter, a transmission signal input electrode, a reception signal output electrode, and a common electrode, and one end of the transmission side filter and one end of the reception side filter are both the common electrode. And the other end of the transmission side filter is connected to the transmission signal input electrode, the other end of the reception side filter is connected to the reception signal output electrode, the transmission side filter and the The receiving filter includes a plurality of first resonators each including a first inner conductor formed inside the first dielectric block and a first outer conductor formed on an outer surface of the first dielectric block. A duplexer having a dielectric coupling member for coupling the first resonators to each other, wherein the second inner conductor and the second dielectric are formed inside a second dielectric block. Exterior of block A second resonator including a second outer conductor formed in the second outer conductor, the second resonator being disposed between the transmission-side filter and the reception-side filter; The member includes a first inner surface electrode corresponding to the first inner conductor and a second inner surface electrode corresponding to the second inner conductor, and a transmission signal input electrode, a reception signal output electrode, and a common electrode on the outer surface. The first inner surface electrode and the second inner surface electrode are respectively connected to the corresponding first inner conductor and second inner conductor by a connecting member, and the second inner surface electrode of the coupling member is the common electrode. A duplexer that is connected to an electrode. 19. The duplexer according to claim 18, wherein the second inner surface electrode is connected to the common electrode by a connection conductor formed on the outer surface of the dielectric coupling member. 20. The duplexer according to claim 19, wherein the transmission signal input electrode and the reception signal output electrode are capacitively coupled to the first inner surface electrode. 21. The duplexer according to claim 18, wherein at least two first dielectric blocks of the first resonator are integrated. 22. The transceiving device according to claim 18, wherein the second dielectric block is integrated with at least one first dielectric block of the first resonator. Shared device.