JPH06291513A - High frequency circuit device containing dielectric resonator - Google Patents

Abstract

PURPOSE:To easily provide plural pieces of dielectric resonators of each different frequency in the same dielectric block by allowing a first and a second resonance holes to have each different opening area. CONSTITUTION:The device is provided with a dielectric block 1 of a rectangular parallelopiped consisting of dielectric magnetism. A first and a second resonance holes 4, 5 of the same length are provided from one end face 2 of the dielectric block 1 so as to reach the other end face 3 opposed thereto, and an antenna coupling hole 6 is provided between them. On the wall surfaces of a first and a second resonance holes 4, 5, a first and a second internal conductors 7, 8 are provided, and in the coupling hole 6, a third conductor 9 is provided. On four side faces 10 of the dielectric block 1, an external conductor 11 is provided. On a second end face 3, a short circuit conductor 12 for short-circuiting the internal conductors 7, 8 and the external conductor 11 is provided. In such a way, in each resonance hole 4, 5, a first and a second resonators of a 1/4 wavelength type are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency circuit device including a dielectric resonator for cordless telephones, car telephones and the like.

[0002]

2. Description of the Related Art A duplexer used in a transceiver has a dielectric resonator for forming a transmitting circuit and a dielectric resonator for forming a receiving circuit arranged side by side. Is connected to an antenna for both transmission and reception. As another circuit device including a dielectric resonator, a dielectric filter is known in which a plurality of resonance holes are provided in one dielectric block and coupling holes are provided between these resonance holes.

[0003]

By the way, the duplexer is
Not only is it large in size when it is configured by combining two independent dielectric resonators, but also the cost is high because the number of parts is large. In order to solve this kind of problem, the applicant of the present application forms the first and second resonance holes in the same dielectric resonator and provides a coupling hole between them to form the first resonance hole. A resonator on the receiving side was constructed by, the resonator on the transmitting side was constructed by the second resonant hole, and a duplexer was produced in which an antenna connection terminal was provided in the coupling hole. In the case of a transceiver, it is usual that the transmission frequency and the reception frequency have a slight difference. Therefore, according to a known technique, the lengths of the first and second resonance holes are made different from each other to resonate the two resonators. Different frequencies were used. 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 formed in the dielectric block, which complicates the manufacturing of the dielectric resonator and inevitably increases the cost. Moreover, the dielectric block was easily damaged.

Therefore, a first object of the present invention is to provide a high frequency circuit device including a dielectric resonator in which a plurality of dielectric resonators having different frequencies can be easily arranged in the same dielectric block. Especially. A second object of the present invention is to reduce the size and cost of the duplexer.

[0005]

The invention for achieving the above-mentioned first object is to provide 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 surfaces and side surfaces 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, and the first and second inner conductors are formed in the first and second resonance holes, respectively. A conductor is formed on the side surface, and the opening areas of the first and second resonance holes are different so that the resonance frequencies of the first and second resonators based on the first and second resonance holes are different from each other. The present invention relates to a high-frequency circuit device including a dielectric resonator having. The invention for achieving the second object of the present invention is
It has one end face and the other end face opposite to it, and a side face, and is formed so as to reach from the one end face to the other end face and has different sizes or shapes so as to obtain different resonance frequencies. A dielectric block having first and second resonance holes formed and a coupling hole formed between the first and second resonance holes, and the dielectric block formed in the first and second resonance holes. First and second inner conductors, a third inner conductor formed in the coupling hole, an outer conductor formed in the side surface, and a first inner conductor for connecting a receiving circuit. First coupling means, and second coupling means coupled to the second inner conductor for connecting a transmitter circuit,
And a third coupling means coupled to the third inner conductor for connecting an antenna. As described in claim 3, it is desirable that the first and second resonance holes are through holes having an opening area.

[0006]

It has been confirmed by experiments that the resonance frequency changes when the opening areas (cross-sectional areas) of the first and second resonance holes are changed. The reason for this has not yet been clarified. If the resonators of different frequencies are formed by the difference in the size of the resonance hole, it is not necessary to give the difference in the length of the resonance hole, and the step does not occur in the dielectric block. Therefore, a high-frequency circuit device such as a duplexer or a dielectric filter including a plurality of dielectric resonators can be easily manufactured, cost can be reduced, and the dielectric block is not broken due to a step. According to the second aspect, since the two resonators in the resonator are formed of the same dielectric block, it is possible to reduce the size and cost. According to claim 3, it is possible to obtain the same effect as that of claim 1.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission / reception high-frequency circuit device (shared device) including a transmission resonator and a reception resonator according to an embodiment of the present invention will be described below with reference to FIGS. This transmission / reception high-frequency circuit device has a rectangular parallelepiped dielectric block 1 made of a dielectric ceramic. One end face 2 of this dielectric block
The first and second resonance holes 4 and 5 having the same length are provided so as to reach the other end surface 3 opposite thereto, and the antenna coupling hole 6 is provided between them. First and second
The first and second inner conductors 7, 8 are provided on the wall surfaces of the resonance holes 4, 5 of
Is provided, and the coupling hole 6 is provided with a third conductor 9. An outer conductor 11 is provided on the four side surfaces 10 of the dielectric block 1.
Is provided. The second end face 3 is provided with a short-circuit conductor 12 for short-circuiting the inner conductors 7 and 8 and the outer conductor 11. As a result, quarter wave type first and second resonators are formed in the respective resonance holes 4 and 5. In addition, each conductor 7,
Reference numerals 8, 9, 11, and 12 are conductors formed by applying and baking a conductive paste or plating.

First based on first and second resonant holes 4, 5
In order to use the first and second resonators as a filter of a transmission / reception circuit, the first and second resonance holes 4 and 5 are provided.
First and second coupling capacitors 1 as coupling means for
3, 14 are inserted, and an antenna coupling terminal 15 as a third coupling means is inserted in the antenna coupling hole 6.
One terminal 16, 17 of the first and second coupling capacitors 13, 14 is coupled to the first and second inner conductors 7, 8.
The other terminals 18 and 19 extend outward so as to function as external connection terminals. 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 is coupled.
Extend in the same direction as the terminals 18, 19 of the coupling capacitors 13, 14.

First and second coupling capacitors 13 and 14
In order to easily achieve the mounting of the antenna coupling terminal 15, they are integrated by the resin body 22. A shield body 23 is also integrated with the resin body 22. A shield body 23 in which a metal plate is bent in 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, 23f, and 23g, and a portion 23b that covers a pair of side surfaces, It is fixed to the outer conductor 11 on the outer peripheral surface of the dielectric block 1 by soldering by 23c.

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

FIG. 5 shows an equivalent circuit of the transmitting and receiving high frequency circuit device of FIGS. 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 terminals 18 and 19 of 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 the capacitor C1 and
C2 and inductances L1 and L2 are equivalently shown. The antenna circuit 33 can be equivalently shown by a capacitor Ca and an 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.

In the transceiver, it is necessary to make a slight difference between the transmission frequency and the reception frequency, and it is also necessary to make a difference in the resonance frequencies of the first and second resonators 31 and 32. become. Therefore, in this embodiment, different resonance frequencies are obtained by making the diameters of the circular resonance holes 4 and 5, that is, the opening areas different. The reason why the resonance frequency changes due to the change in diameter of the resonance holes 4 and 5 has not yet been logically clarified. However, as shown in FIG. 6, the diameter φ of the resonance hole is
It was confirmed by experiments that the resonance frequency f0 changes by changing In this way, if only the diameter is changed without changing the lengths of the resonators 4 and 5, a step is not generated in the dielectric block 1, so that not only the manufacturing is facilitated, but also the destruction is difficult. Further, since the transmitting resonator and the receiving resonator are formed in the same dielectric block, the resonator can be downsized and the cost can be reduced.

An experiment for investigating the relationship between the diameter of the resonance hole and the resonance frequency was conducted as follows. A plurality of prismatic dielectric blocks each having 4 mm in length and width and 9.3 mm in length are prepared, and the diameter of the circular resonance hole from one end face to the other end face is φ.
Is changed to 1.23 mm, 1.72 mm, and 2.19 mm, and a quarter-wave dielectric resonator having an inner conductor, an outer conductor, and a short-circuit conductor is formed for each, and the resonance frequency of each is changed. It was measured. FIG. 6 shows the results of this experiment, in which the resonance frequency f0 increases as the diameter φ increases. Note that FIG. 6 shows an average value of nine resonators having resonance holes of the same diameter.

[0014]

MODIFICATION The present invention is not limited to the above-mentioned embodiments, and the following modifications are possible. (1) A dielectric having a structure in which instead of the antenna coupling hole 6 of FIGS. 1 and 2, a coupling hole for mutually coupling the first and second resonators based on the first and second resonance holes 4 and 5 is provided. In the filter, the diameters of the first and second resonance holes can have different values. Further, in a multi-stage dielectric filter in which three or more resonance holes are provided in parallel in the same dielectric block, and these are mutually coupled by a coupling hole and / or a capacitor, for example, the diameter of the resonance holes on both sides is set to that of the middle resonance hole. It can be larger than the diameter. In this case, the bandwidth can be adjusted by the difference in the resonance frequency. (2) The resonance holes 4 and 5 can be formed in a quadrangular shape, a polygonal shape, and an elliptical shape in a plan view. (3) A single or a plurality of resonance holes and mutual coupling holes are added between the resonance hole 4 and the antenna coupling hole 6 and / or between the resonance hole 5 and the antenna coupling hole 6, and the reception side and / or the transmission side The side can be configured as a dielectric filter having two or more stages. (4) The diameter of the receiving side resonance hole 4 can be made larger than the diameter of the receiving side resonance hole 5. (5) The half-wave resonator can be formed by omitting the short-circuit conductor 12.

[Brief description of drawings]

FIG. 1 is a plan view showing a transmitting / receiving high-frequency circuit device including a dielectric resonator according to an embodiment.

2 is a cross-sectional view taken along the line AA of the high frequency circuit device 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 is an equivalent circuit diagram of the circuit device of FIG.

FIG. 6 is a diagram showing a relationship between a diameter of a resonance hole of a dielectric resonator and a resonance frequency.

[Explanation of symbols]

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

Claims (3)

[Claims] 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
A high-frequency circuit device including a dielectric resonator, wherein the resonance holes have different opening areas. 2. One end face and the other end face and a side face opposite to the one end face are formed, and are formed so as to extend from the one end face to the other end face and different so as to obtain different resonance frequencies. A dielectric block having first and second resonance holes formed in size or shape and a coupling hole formed between the first and second resonance holes; and the first and second resonance holes. The first and second inner conductors, the third inner conductor formed in the coupling hole, the outer conductor formed on the side surface, and the first inner conductor for connecting the 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 wave characterized by comprising: Circuit device. 3. The high frequency circuit device according to claim 2, wherein the first and second resonance holes are through holes having substantially the same length and different opening areas.