JPH0677308U - High frequency circuit device including dielectric resonator - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve downsizing and cost reduction of duplexers. The dielectric block 1 is provided with a receiving resonance hole 4, a transmitting resonance hole 5, and an antenna coupling hole 6. Different lengths of the inner conductor 7 of the receiving resonance hole 4 and the length of the inner conductor 8 of the transmitting resonance hole 5 are used to obtain different resonance frequencies.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency circuit device including a dielectric resonator such as a duplexer of a transmission / reception circuit for use in a cordless telephone, a car telephone and the like.

[0002]

[Prior art]

 A duplexer used in a transceiver is a juxtaposition of a dielectric resonator for composing a filter of a transmitter circuit and a dielectric resonator for composing a filter of a receiver circuit. It is configured to connect to an antenna for both transmission and reception.

[0003]

[Problems to be solved by the device]

 By the way, if the duplexer is composed of a combination of two independent dielectric resonators, not only the size becomes large, but also the cost increases because the number of parts increases. In order to solve this kind of problem, the applicant of the present invention forms the first and second resonance holes in the same dielectric block, and provides the coupling holes between them, so that the first resonance hole is used. We constructed a prototype of a duplexer, which comprises a resonator on the receiving side, a resonator on the transmitting side with a second resonance hole, and an antenna connection terminal in the coupling hole. In the case of a transceiver, since there is usually a slight difference between the transmission frequency and the reception frequency, the two resonators are provided with different lengths of the first and second resonance holes according to known techniques. The resonance frequency of is set to a different value. As a result, miniaturization and cost reduction have been achieved to some extent. However, if the lengths of the transmitting and receiving resonance holes are made different, a step is created in the dielectric block made of porcelain, making the duplexer cumbersome to manufacture and inevitably costly. Moreover, the dielectric block was easily damaged.

Therefore, an object of the present invention is to reduce the size and cost of a high frequency circuit device including a plurality of dielectric resonators.

[0005]

The present invention for achieving the above object provides a dielectric block having at least first and second resonance holes, first and second inner conductors, and an outer conductor. And a dielectric block having first and second end faces and side faces facing each other, and the first and second resonance holes have substantially the same length. Is formed so as to extend from the first end face to the second end face with a height, and the first and second inner conductors are formed in the first and second resonance holes, respectively. The outer conductor is formed on the side surface, and the outer conductors of the first and second resonance holes are formed to have a difference in resonance frequency of the first and second resonators based on the first and second resonance holes. High frequency circuit including a dielectric resonator, characterized in that the first and second inner conductors have different lengths Relating to the location is also of the. A second aspect of the present invention is the first and second end surfaces having one end surface, the other end surface and a side surface facing the one end surface, and extending from the one end surface to the other end surface. A dielectric block having a resonance hole and a coupling hole formed between the first and second resonance holes; a first inner conductor formed in the first resonance hole; A second inner conductor formed in the second resonance hole so as to have a length different from that of the inner conductor, a third inner conductor formed in the coupling hole, and an outer side formed in the side surface. A conductor, a first coupling means coupled to the first inner conductor for connecting a receiving circuit, and a second coupling means coupled to the second inner conductor for connecting a transmitting circuit. , A third coupling means coupled to the third inner conductor for connecting an antenna. Those involved.

[0006]

[Operation and effect of the device]

 When the lengths of the first and second inner conductors in the first and second resonance holes are changed, the resonance frequency changes. Therefore, it is not necessary to form resonance holes having different lengths, and no step is formed on the dielectric block. Therefore, a high-frequency circuit device including a plurality of dielectric resonators can be easily manufactured, cost can be reduced, and damage to the dielectric block due to a step does not occur.

[0007]

[Embodiment] Next, a duplexer according to an embodiment of the present invention will be described with reference to FIGS. This duplexer has a rectangular parallelepiped dielectric block 1 made of a dielectric ceramic. First and second resonance holes 4 and 5 of the same length are provided from one end surface 2 of this dielectric block to the other end surface 3 opposite thereto, and an antenna coupling hole is provided between them. 6 are provided. First and second inner conductors 7 and 8 having different lengths are provided on the wall surfaces of the first and second resonance holes 4 and 5, and the coupling hole 6 is provided with a third conductor 9. . Outer conductors 11 are provided on the four side surfaces 10 of the dielectric block 1. A short-circuit conductor 12 for short-circuiting the inner conductors 7 and 8 and the outer conductor 11 is provided on the second end face 3. As a result, quarter wave type first and second resonators are formed in the respective resonance holes 4 and 5. The conductors 7, 8, 9, 11, and 12 are made of a conductor formed by applying and baking a conductive paste or plating.

In order to use the first and second resonators based on the first and second resonance holes 4 and 5 as a filter of a transmission / reception circuit, the first and second resonance holes 4 and 5 have first and second resonance holes, respectively. Also, the first and second coupling capacitors 13 and 14 serving as the second coupling means are inserted, and the antenna coupling terminal 15 serving as the third coupling means is inserted into the antenna coupling hole 6. One terminal 16 and 17 of the first and second coupling capacitors 13 and 14 is coupled to the first and second inner conductors 7 and 8, and the other terminal 18 and 19 is outside so as to function as an external connection terminal. Extends to. One end 20 of the rod-shaped antenna coupling terminal 15 is coupled to the conductor 9 of the coupling hole 6, and the other end 21 extends in the same direction as the terminals 18 and 19 of the coupling capacitors 13 and 14.

In order to easily mount the first and second coupling capacitors 13 and 14 and the antenna coupling terminal 15, they are integrated by a resin body 22. A shield body 23 is also integrated with the resin body 22. The shield body 23 formed by bending a metal plate into a U-shape has a portion 23a that covers the first end surface 2 of the dielectric block 1, portions 23b and 23c that covers a pair of side surfaces, and four ground terminals 23d, 23e, and 23f. , 23g, which are fixed to the outer conductor 11 of the dielectric block 1 by soldering by the portions 23b, 23c covering the pair of side surfaces.

The conductor 9 of the antenna coupling hole 6 is not directly connected to the short-circuit conductor 12 as shown in FIGS. 4 and 5.

FIG. 6 shows an equivalent circuit of the duplexer of FIGS. 1 and 2. C1 and C2 correspond to the coupling capacitors 13 and 14, and the receiving side terminal Tr and the transmitting side terminal Tx correspond to the terminals 18 and 19 of the capacitors 13 and 14, respectively. The first and second resonators 31 and 32 are resonators based on the first and second resonance holes 4 and 5, and are equivalently shown by capacitors C1 and C2 and inductances L1 and L2. The antenna circuit 33 is equivalently shown by the capacitor Ca and the inductance La. The first and second resonators 31 and 32 and the antenna circuit 33 are coupled to each other with impedances Z1 and Z2. The first and second resonators 31 and 32 function as filters for the receiving circuit and the transmitting circuit.

In the transceiver, it is necessary to make a slight difference between the transmission frequency and the reception frequency, and it is necessary to make the resonance frequencies of the first and second resonators 31 and 32 also different. You will need it. Therefore, in this embodiment, different resonance frequencies are obtained by making the lengths of the first and second inner conductors 7 and 8 of the first and second resonance holes 4 and 5 different. In this way, if only the lengths of the first and second inner conductors 7 and 8 are changed without changing the lengths of the resonators 4 and 5, steps are not generated in the dielectric block 1, so that the manufacturing is facilitated. Not only that, but it is also difficult to destroy. In addition, the resonator for transmission and the resonator for reception are formed in the same dielectric block, so that the resonator can be downsized and the cost can be reduced.

[0013]

[Another embodiment]

 Next, a duplexer of another embodiment will be described with reference to FIGS. 7 and 8. However, in FIGS. 7 and 8, the same parts as those in FIGS. 1 to 5 are designated by the same reference numerals and the description thereof will be omitted. In FIGS. 7 and 8, the dielectric block 1 is provided with the first and second resonance holes 4 and 5 and the antenna coupling hole 6 in the same manner as in FIGS. The resonance hole 40 and the mutual coupling hole 41 are provided. First and second inner conductors 7 and 8 are provided in the first and second resonance holes 4 and 5 in the same manner as in FIG. 5, and a third inner conductor 9 is provided in the antenna coupling hole 6 as shown in FIG. It is provided in the same way. The third resonance hole 40 is provided with a fourth inner conductor 41 having substantially the same length as that of the first inner conductor 7 of the first resonance hole 4. The coupling hole 41 is provided between the first and third resonance holes 4 and 40, and is for connecting these to each other, and no inner conductor is provided therein.

Similar to FIG. 2, coupling capacitors 13 and 14 are coupled to the first and second resonance holes 4 and 5, and an antenna terminal 15 is coupled to the antenna coupling hole 6. The resonators based on the first and third resonance holes 4 and 40 are coupled to each other to function as a well-known two-stage dielectric filter. Also in the duplexer of this embodiment, the same effect as that of the duplexer of FIGS. 1 to 5 can be obtained.

[0015]

[Modification]

 The present invention is not limited to the above-mentioned embodiments, and the following modifications are possible, for example. (1) Another resonance hole and a coupling hole can be added between the second resonance hole 5 and the antenna coupling hole 6, and the filter on the transmission side can also have a two-stage dielectric filter configuration. Further, the transmitting side filter and the receiving side filter can be configured with three or more stages of dielectric filters. (2) The resonance holes 4 and 5 can be formed in a planar shape of a quadrangle, a polygon, or an ellipse. Further, the diameters of the first and second resonance holes 4 and 5 can be set to different values. That is, the applicant of the present application has confirmed that the resonance frequency increases as the diameter of the resonance holes 4 and 5 increases. Therefore, the resonance frequencies can be set to different values depending on the combination of the diameters of the resonance holes 4 and 5 and the lengths of the first and second inner conductors 7 and 8. (3) The length of the inner conductor 8 of the second resonance hole 5 can be set shorter than the length of the inner conductor 7 of the first resonance hole 4. (4) In FIG. 2, the second inner conductor 8 may be configured not to be provided near the end face 2. (5) The short-wave conductor 12 can be omitted to form a half-wavelength resonator.

[Brief description of drawings]

FIG. 1 is a plan view showing a duplexer of an embodiment.

2 is a cross-sectional view taken along the line AA of the duplexer of FIG.

FIG. 3 is a perspective view of a dielectric block having the conductor of FIG.

4 is a perspective view showing a bottom surface side of a dielectric block having the conductor of FIG. 2. FIG.

5 shows a dielectric block having the conductor of FIG.
It is sectional drawing shown by the -A line.

FIG. 6 is an equivalent circuit diagram of the duplexer of FIG.

FIG. 7 is a plan view showing a dielectric block having a conductor of a duplexer of another embodiment.

FIG. 8 is a cross-sectional view showing a portion corresponding to line BB in FIG.

[Explanation of symbols]

 1 Dielectric block 4, 5 Resonance hole 6 Coupling hole for antenna

Claims (2)

[Scope of utility model registration request] 1. A high frequency circuit device comprising: a dielectric block having at least first and second resonance holes; first and second inner conductors; and an outer conductor, wherein the dielectric blocks are mutually Has first and second end faces and a side face that face each other, and the first and second resonance holes have substantially the same length and extend from the first end face to the second end face. The first and second inner conductors are respectively formed in the first and second resonance holes, the outer conductor is formed on the side surface, and the first and second resonance holes are formed. In order to make a difference in the resonance frequency of the first and second resonators based on
1. A high-frequency circuit device including a dielectric resonator, wherein the first and second inner conductors of the resonance hole have different lengths. 2. A first and a second resonance hole having one end face, the other end face and a side face opposite to the one end face, and formed from the one end face to the other end face, and the first and second resonance holes. A dielectric block having a coupling hole formed between the first and second resonance holes, a first inner conductor formed in the first resonance hole, and a length different from that of the first inner conductor. The second to have a
Second inner conductor formed in the resonance hole, a third inner conductor formed in the coupling hole, an outer conductor formed in the side surface, and the first inner conductor for connecting a receiving circuit. First coupling means coupled to the conductor, second coupling means coupled to the second inner conductor for connecting the transmitting circuit, and coupling to the third inner conductor for connecting the antenna High-frequency circuit device including a dielectric resonator, characterized by comprising: