JPH0744373B2 - Waveguide type dielectric resonator device - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An example of a TM mode dielectric resonator which is the background of the present invention is disclosed in Japanese Patent Application Laid-Open No. 61-121502. In this TM mode dielectric resonator, a plurality of prismatic dielectric resonators are arranged in a case so as to intersect each other. By arranging in this way,
The dielectric resonator device can be downsized as compared with the case where a plurality of prismatic dielectric resonators are arranged in parallel.

[0003]

However, when a resonator device is formed by intersecting a plurality of prismatic dielectric resonators at right angles, it is difficult to obtain strong coupling between the resonators. Further, when a resonator device is configured by intersecting a plurality of prismatic dielectric resonators at an angle other than a right angle, the mounting direction of each resonator is different, the shape of the case becomes complicated, and the dielectric resonator device is Difficult to manufacture.

Therefore, a main object of the present invention is to provide a waveguide type dielectric resonator device in which the coupling between a plurality of resonators is strong, the size is small, and the manufacturing is simple.

[0005]

According to the present invention, two columnar resonators are formed in a cross shape and integrally with each other, and at least one orthogonal portion of the cross portions of the two resonators has another orthogonal shape. It is a waveguide type dielectric resonator device including a resonator group formed to have a shape different from that of the portion.

[0006]

By forming the shape of at least one orthogonal portion of the resonator group different from the shape of the other orthogonal portions, o
The resonance frequency in the dd mode and the resonance frequency in the even mode are different. Thereby, the two resonators are electromagnetically coupled.

[0007]

Since the two resonators can be integrally formed and they are electromagnetically coupled, the size can be reduced as compared with the case where the two resonators are separately formed. Moreover, 2
By using the resonators arranged in parallel with the two resonators, it is possible to obtain a waveguide type dielectric resonator device in which the coupling between the resonators is strong.

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

[0009]

1 is a perspective view showing an embodiment of the present invention. The waveguide type dielectric resonator device 10 includes a case 11. This case 11 functions as a TE ₁₀ metallic blocking rectangular waveguide. In the case 11, the first resonator group 12
Is attached. The first resonator group 12 is comprised of a resonator 16 of the final stage with a first-stage resonator 14 and the TM ₁₁₀ mode with TM ₁₁₀ mode. First stage resonator 1
The resonators 4 and 16 in the final stage are formed of, for example, a ceramic dielectric. The first-stage resonator 14 is formed in, for example, a rectangular parallelepiped shape. A first conductor layer 14a is formed at the center of one end face of the resonator 14 in the first stage, and a second conductor layer 14b is formed at the peripheral portion thereof. In addition, a conductor layer 14c is formed on the entire other end surface of the first-stage resonator 14.

Further, the resonator 16 at the final stage is formed in a rectangular parallelepiped shape having a hole 16a in the center thereof. Then, the resonator 14 of the first stage is fitted into the hole 16a of the resonator 16 of the final stage. By doing this, the first-stage resonator 14
And the final stage resonator 16 are combined in a cross shape. Similarly to the first-stage resonator 14, the first conductor layer 16b and the second conductor layer 16c are also provided on one end surface of the last-stage resonator 16.
Is formed. Further, the conductor layer 16d is formed on the entire other end face of the resonator 16 at the final stage.

The conductor layers 14a, 14 of the first-stage resonator 14
b, 14c and conductor layers 16b, 16 of the final stage resonator
The c and 16d are formed, for example, by printing or printing silver paste or the like. The case 11 is formed with through holes 11a and 11b for exposing the conductor layer 14a of the first-stage resonator 14 and the conductor layer 16b of the last-stage resonator 16. Then, the conductor layers 14b and 14c of the first-stage resonator 14 and the conductor layers 16c and 16d of the last-stage resonator 16 are soldered to the case 11, for example, to fix the first resonator group 12.
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 respectively formed in the through holes 11
Located in parts a and 11b.

Further, a second resonator group 20 is fixed inside the case 11. The second resonator group 20 is shown in FIG.
As shown in, and a resonator 24 of the third stage having a TM ₁₁₀ mode and the resonator 22 in the second stage having a TM ₁₁₀ mode. Second-stage resonator 22 and third-stage resonator 24
And are formed in a cross shape and integrally. Like the first resonator group 12, the second resonator group 20 is also formed of, for example, a ceramic dielectric. Second stage resonator 22
For example, silver paste is printed on both sides of the
The conductor layers 22a and 22b are formed by baking or the like. Similarly, conductor layers 24a and 24b are formed on the entire surfaces of both end surfaces of the third-stage resonator 24. Then, the conductor layers 22a, 22 of the second-stage resonator 22
b and the conductor layers 24a and 24b of the third-stage resonator 24 are soldered to the case 11, for example,
The second resonator group 20 is fixed.

The second-stage resonator 22 is arranged in parallel with the first-stage resonator 14, and the third-stage resonator 24 is arranged in parallel with the last-stage resonator 16. Therefore, the first-stage resonator 14 and the second-stage resonator 22 are electromagnetically coupled. Similarly, the resonator 16 at the final stage and the resonator 24 at the third stage are electromagnetically coupled.

Notches 26a and 26b are formed in one diagonal portion of the face-to-face portion of the second resonator group 20. Further, additional portions 28a and 28b are formed at the other diagonal portion of the face-to-face portion of the second resonator group.

The electromagnetic field distribution of the coupled resonance mode of the second resonator group 20 is shown in FIGS. 3 and 4. For comparison with this, the electromagnetic field distribution of the resonator group in which the cut portion and the additional portion are not formed is shown in FIGS. 5 and 6. The number of lines of electric force in the odd mode of the second resonator group 20 is larger than the number of lines of electric force shown in FIG. 5 because the additional portions 28a and 28b are formed as shown in FIG. Many. Therefore, the resonance frequency f _odd in the odd mode of the second resonator group 20 becomes lower than the resonance frequency of the resonator group shown in FIG. The number of electric lines of force in the even mode of the second resonator group 20 is the same as that of the electric lines of force shown in FIG. 6 due to the formation of the cut portions 26a and 26b as shown in FIG. Less than the number. Therefore, eve of the second resonator group 20
The resonance frequency f _even in the n mode is higher than the resonance frequency of the resonator group shown in FIG.

In the example of the resonator group shown in FIGS. 5 and 6,
Since it equal the resonant frequency f _even at the resonance frequency f _odd and even mode in odd mode, The coupling coefficient k represented by is 0. Therefore, such a resonator group is not electromagnetically coupled. On the other hand,
In the second resonator group 20, the coupling coefficient k does not become 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
The fourth stage resonator 16 and the fourth stage resonator 16 are electromagnetically coupled via the second stage resonator 22 and the third stage resonator 24.

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

As shown in FIG. 8, the final stage resonator 16 also has a female connector 34 and a male connector (not shown).
A coaxial cable is connected via. Then, an output signal is obtained through this coaxial cable.

A screw 38 for adjusting coupling is attached from the corner of the case 11 toward the first resonator group 12, if necessary. With this screw 38, the first-stage resonator 1
4 and the resonator 16 at the final stage are adjusted, and the characteristics of the waveguide type dielectric resonator device 10 are adjusted accordingly.

Such a waveguide type dielectric resonator device 10
Then, the first resonator group 12 combined in a cross shape in the case 11 and the second resonator group 20 integrally formed.
By attaching and, the size can be made 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 last-stage resonator 16 are arranged in parallel, a large degree of coupling is obtained. Therefore, the waveguide type dielectric resonator device 10 having a wide band can be obtained. Further, the case 11 can be formed in a simple shape such as a square, and therefore the waveguide type dielectric resonator device 10 can be easily manufactured.

The structure of the first resonator group 12 is superior to the second resonator group 20 in terms of spurious characteristics, but the coupling between the resonators is difficult. On the contrary, the structure of the second resonator group 20 is easy to establish the coupling between the resonators, but is inferior to the first resonator group 12 in terms of spurious characteristics. Therefore,
The structure in which the first-stage and last-stage resonators that need to suppress spurious generation as much as possible while not needing strong coupling is used as in the above-described embodiment, and the interstages that require sufficient coupling rather than spurious characteristics are used. It is significant to make the combined structure of the resonators as in the above-mentioned embodiment.

In the above-described embodiment, the cut portions 26a and 26b are formed in the diagonal portions of the cross-shaped portion of the second resonator group 20.
Although the additional portions 28a and 28b are formed, only one of them may be formed. Furthermore, these notches and additional portions do not necessarily have to be formed in the diagonal portions of the cross-shaped portion, and may be formed in only one place. That at least one location surface exchange unit of the second cross-shaped portion of the resonator groups, may be formed in different shapes and other aspects and Transportation.

In the above embodiment, the waveguide type dielectric resonator device having four stages of resonators has been described.
The present invention can also be applied to a waveguide type dielectric resonator device having a multistage resonator having four or more stages. For example, in order to construct a waveguide type dielectric resonator device having six-stage resonators, the first resonator group 12 in the above-described embodiment is used.
A resonator group having the same configuration as the first or second resonator group may be arranged between the second 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 the two resonator groups. In short, in the present invention, the first-stage resonator and the middle-stage resonator may be directly or indirectly coupled, and the last-stage resonator and another middle-stage resonator may be directly or indirectly coupled. Be connected to.

Furthermore, the waveguide does not necessarily have to be a metal case. For example, a box shape may be formed of the same material as each resonator so as to surround each resonator group, and a metallized layer may be formed around the box with a conductive material. In this case, the metallization layer acts as a waveguide.

[Brief description 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 FIG. 1 embodiment.

FIG. 3 is an od of a second resonator group used in the embodiment of FIG.
It is an illustration figure which shows the electromagnetic field distribution in d mode.

4 is an ev of a second resonator group used in the embodiment of FIG.
It is an illustration figure which shows the electromagnetic field distribution in en mode.

FIG. 5 is an illustrative view 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 view 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.

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

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

[Description of Reference Signs] 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 3 stage Eye resonator

Claims (1)

[Claims] 1. A two-column resonator is integrally formed in a cross shape, and side surfaces of the two resonators intersect each other.
A waveguide-type dielectric resonator including a resonator group in which at least one of the face- to- face portions has a shape different from that of the other face-to-face portions.