JPH04339401A - Waveguide type dielectric resonator device - Google Patents

Abstract

PURPOSE:To obtain a waveguide type dielectric resonator device which is strong in the coupling between plural resonators, small and easy in manufacture. CONSTITUTION:In a case 11, a first resonator group 12 and a second resonator group 20 are formed. The first resonator group 12 incorporates two rectangular parallelopiped-shaped resonators 14 and 16 in a cross way and forms them. The second resonator group 20 forms two columnar resonators 22 and 24 in a cross way and integrally. At the orthogonal part of the cross-shaped part of the second resonator group 20, notch parts 26a and 26b and additional parts 28a and 28b are formed. Either of the notch parts 26a and 26b and the additional parts 28a and 28b may be only formed. The place to form these may be formed at least one orthogonal part of the cross-shaped parts.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide dielectric resonator device, and more particularly to a waveguide dielectric resonator device using a TM mode, and is used, for example, as a filter.

0002

2. Description of the Related Art An example of a TM mode dielectric resonator device which forms the background of the present invention is disclosed in Japanese Patent Application Laid-open No. 121502/1983. In this TM mode dielectric resonator, a plurality of prismatic dielectric resonators are arranged in a case so as to cross each other. By arranging it like this,
The dielectric resonator device can be made smaller than when a plurality of prismatic dielectric resonators are arranged in parallel.

0003

However, when a resonator device is formed by crossing a plurality of prismatic dielectric resonators at right angles, it is difficult to obtain strong coupling between the resonators. Furthermore, if a resonator device is configured by intersecting multiple prismatic dielectric resonators at angles other than right angles, the mounting direction of each resonator will be different, making the case shape complicated, and the dielectric resonator device Difficult to manufacture.

Therefore, the main object of the present invention is to provide a waveguide type dielectric resonator device that has strong coupling between a plurality of resonators, is small in size, and is easy to manufacture.

[0005]

[Means for Solving the Problems] The present invention has two columnar resonators integrally formed in a cross shape, and at least one orthogonal part of the cross-shaped portions of the two resonators has a shape that is orthogonal to the other. This is a waveguide type dielectric resonator device including a group of resonators formed to have a shape different from that of the waveguide.

[0006]

[Operation] By forming the shape of at least one orthogonal part of the resonator group to be different from the shape of other orthogonal parts, o
The resonant frequency in dd mode and the resonant frequency in even mode are different. Thereby, the two resonators are electromagnetically coupled.

[0007]

Effects of the Invention Since the two resonators can be formed integrally and are electromagnetically coupled, the size can be reduced compared to the case where the two resonators are formed separately. Moreover, 2
By using resonators arranged in parallel to one resonator, a waveguide dielectric resonator device with strong coupling between the resonators can be obtained.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an embodiment of the present invention. This waveguide dielectric resonator device 10 includes a case 11 . This case 11 functions as a TE10 metallic blocking rectangular waveguide. Inside the case 11, there is a first resonator group 1.
2 is attached. The first resonator group 12 is TM11
It is composed of a first stage resonator 14 having a TM110 mode and a final stage resonator 16 having a TM110 mode. The first stage resonator 14 and the last stage resonator 16 are formed of, for example, a ceramic dielectric material. The first stage resonator 14 is formed, for example, in the shape of a rectangular parallelepiped. On one end surface of the first-stage resonator 14, a first conductor layer 14a is formed at the center thereof, and a second conductor layer 14b is formed at the periphery thereof. Furthermore, a conductor layer 14c is formed on the entire surface of the other end surface of the first stage resonator 14.

The final stage resonator 16 is formed in the shape of a rectangular parallelepiped with a hole 16a in its center. Then, the first stage resonator 14 is fitted into the hole 16a of the final stage resonator 16. By doing this, the first stage resonator 14
and the final stage resonator 16 are combined in a cross shape. Also on one end surface of the final stage resonator 16, a first conductor layer 16b and a second conductor layer 16c are formed, similarly to the first stage resonator 14.
is formed. Furthermore, a conductor layer 16d is formed on the entire surface of the other end surface of the final stage resonator 16.

Conductor layers 14a and 14b of the first stage resonator 14
, 14c and the conductor layers 16b, 16c of the final stage resonator.
, 16d are formed by, for example, printing or baking silver paste. In addition, in case 11,
Through holes 11a and 11b are formed to expose the conductor layer 14a of the first stage resonator 14 and the conductor layer 16b of the last stage resonator 16. The conductor layers 14b and 14c of the first-stage resonator 14 and the conductor layer 1 of the final-stage resonator 16
The first resonator group 12 is fixed by soldering the resonators 6c and 16d to the case 11, for example. At this time, the conductor layer 14a of the first stage resonator 14 and the conductor layer 16b of the last stage resonator 16 are connected to the through hole 11, respectively.
Located in portions a and 11b.

Furthermore, a second resonator group 20 is fixed inside the case 11. The second resonator group 20 is shown in FIG.
As shown in FIG. 2, it is composed of a second stage resonator 22 having a TM110 mode and a third stage resonator 24 having a TM110 mode. The second stage resonator 22 and the third stage resonator 24 are integrally formed in a cross shape. Like the first resonator group 12, the second resonator group 20 is also formed of, for example, a ceramic dielectric material. Conductor layers 22a and 22b are formed on both end faces of the second stage resonator 22 by printing and baking silver paste, for example, on the entire surface thereof. Similarly, conductor layers 24a and 24b are formed on the entire surface of both end faces of the third stage resonator 24. The conductor layer 22a of the second stage resonator 22,
22b and the conductor layers 24a, 24 of the third stage resonator 24
The second resonator group 20 is fixed by, for example, being soldered to the case 11.

The second stage resonator 22 is arranged parallel to the first stage resonator 14, and the third stage resonator 24 is arranged parallel to the final stage resonator 16. Therefore, the first stage resonator 14 and the second stage resonator 22 are electromagnetically coupled. Similarly, the final stage resonator 16 and the third stage resonator 24 are electromagnetically coupled.

Cut portions 26a and 26b are formed in one diagonal portion of the orthogonal portion of the second resonator group 20. As shown in FIG. Further, additional portions 28a and 28b are formed at the other diagonal portion of the orthogonal portion of the second resonator group 20.

The electromagnetic field distribution of the coupled resonance mode of the second resonator group 20 is shown in FIGS. 3 and 4. For comparison, the electromagnetic field distribution of a resonator group in which no notch or additional portion is formed is shown in FIGS. 5 and 6. As shown in FIG. 3, the number of electric lines of force in the odd mode of the second resonator group 20 is greater than the number of lines of electric force shown in FIG. many. Therefore, the resonant frequency fodd of the second resonator group 20 in the odd mode is smaller than the resonant frequency of the resonator group shown in FIG. Further, the number of electric lines of force in the even mode of this second resonator group 20 is determined by the number of lines of electric force in the notches 26a and 26, as shown in FIG.
b is formed, the number of electric lines of force is smaller than that shown in FIG. Therefore, e of the second resonator group 20
The resonant frequency feven in the ven mode is larger than the resonant frequency of the resonator group shown in FIG.

In the example of the resonator group shown in FIGS. 5 and 6,
Resonant frequency fodd and even in odd mode
Since the resonance frequency feven in the mode is equal,
The coupling coefficient k shown by becomes 0. Therefore, such a resonator group is not electromagnetically coupled. On the other hand,
In the second resonator group 20, the coupling coefficient k is not 0, so that the second-stage resonator 22 and the third-stage resonator 24 are electromagnetically coupled. As a result, the first stage resonator 1
4 and the final stage resonator 16 are electromagnetically coupled via the second stage resonator 22 and the third stage resonator 24.

As shown in FIG. 7, a coaxial cable is connected to the first stage resonator 14 via a female connector 30 and a male connector (not shown). Then, an input signal is applied through a coaxial cable between the first conductor layer 14a and the second conductor layer 14b of the first stage resonator 14.

The final stage resonator 16 also has a female connector 34 and a male connector (not shown), as shown in FIG.
A coaxial cable is connected via the An output signal is then obtained through this coaxial cable.

Note that a screw 38 for coupling adjustment is attached from a corner of the case 11 toward the first resonator group 12 as necessary. This screw 38 connects the first stage resonator 1.
4 and the final stage resonator 16 is adjusted, thereby adjusting the characteristics of the waveguide dielectric resonator device 10.

Such a waveguide dielectric resonator device 10
Here, a first resonator group 12 combined in a cross shape inside a case 11 and a second resonator group 20 integrally formed.
By attaching these, it is possible to make the waveguide type dielectric resonator device smaller than the conventional waveguide type dielectric resonator device. Furthermore, since the first stage resonator 14 and the second stage resonator 22 are arranged in parallel, and the third stage resonator 24 and the final stage resonator 16 are arranged in parallel, a large degree of coupling is obtained. Accordingly, a broadband waveguide dielectric resonator device 10 can be obtained. Further, the case 11 can be formed into a simple shape such as a rectangle, so that the waveguide dielectric resonator device 10 can be easily manufactured.

Although the structure of the first resonator group 12 is superior to the second resonator group 20 in terms of spurious characteristics, it is difficult to achieve coupling between the resonators. Conversely, the structure of the second resonator group 20 facilitates coupling between the resonators, but is inferior to the first resonator group 12 in terms of spurious characteristics. therefore,
The combination structure of the first and final stage resonators, which needs to suppress the generation of spurious as much as possible but does not require very strong coupling, is used as in the above embodiment, and the interstages, which require sufficient coupling to avoid spurious characteristics, are used. It is significant to have a combination structure of resonators as in the above embodiment.

In the above-described embodiment, the notches 26a, 26b and the additional portions 28a, 28b were formed at the diagonal portions of the cross-shaped portion of the second resonator group 20, but it is not necessary to form only one of them. You may. Furthermore, these cut portions and additional portions do not necessarily need to be formed at diagonal portions of the cross-shaped portion, and may be formed only at one location. In other words, at least one of the orthogonal parts of the cross-shaped portion of the second resonator group may be formed in a shape different from the other orthogonal parts.

Further, in the above embodiment, a waveguide type dielectric resonator device having four stages of resonators was explained.
The present invention can also be applied to a waveguide type dielectric resonator device having a multi-stage resonator of four or more stages. For example, in order to configure a waveguide dielectric resonator device having six stages of resonators, in the above embodiment, the first resonator group 12
A resonator group having the same configuration as the first or second resonator group may be disposed between the resonator group 20 and the second resonator group 20 . in this case,
The first stage resonator 14 and the last stage resonator 16 are electromagnetically coupled via two resonator groups. In short, in this invention, it is sufficient that the first stage resonator and the middle stage resonator are directly or indirectly coupled, and the final stage resonator and another middle stage resonator are coupled directly or indirectly. It is sufficient if it is connected to

Furthermore, the waveguide does not necessarily have to have a metal case. For example, each resonator group may be surrounded by a box-shaped box made of the same material as each resonator, and a metallized layer made of a conductive material may be formed around the box. In this case, the metallized layer acts as a waveguide.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of the embodiment in FIG. 1;

[Figure 3] od of the second resonator group used in the Figure 1 embodiment
FIG. 3 is an illustrative diagram showing electromagnetic field distribution in d mode.

[Fig. 4] ev of the second resonator group used in the Fig. 1 embodiment.
FIG. 2 is an illustrative diagram showing electromagnetic field distribution in en mode.

FIG. 5 is an illustrative diagram showing an electromagnetic field distribution in an odd mode of a resonator group in which a cut portion and an additional portion are not formed.

FIG. 6 is an illustrative diagram showing an electromagnetic field distribution in an even mode of a resonator group in which a cut portion and an additional portion are not formed.

7 is a sectional view taken along line VII-VII of the embodiment in FIG. 1; FIG.

FIG. 8 is a sectional view taken along line VIII-VIII of the embodiment in FIG. 1;

[Explanation of symbols]

10 Waveguide type dielectric resonator device 12 First resonator group 14 First stage resonator 16 Final stage resonator 20 Second resonator group 22 Second stage resonator 24 Third stage resonator

Claims (1)

[Claims] 1. Two columnar resonators are integrally formed in a cross shape, and the shape of at least one orthogonal part of the cross-shaped parts of the two resonators is different from the shape of the other orthogonal parts. A waveguide dielectric resonator device including a group of formed resonators.