JP3211373B2 - Dielectric resonator and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator in which a plurality of inner conductor forming holes are provided inside a dielectric, and an outer conductor is formed on an outer surface of the dielectric, and a method of manufacturing the same.

[0002]

2. Description of the Related Art An integrated dielectric resonator provided with a plurality of resonators in a dielectric is used as a band-pass filter in a microwave band, for example.

In such an integrated dielectric resonator, a plurality of inner conductor forming holes are provided in a dielectric block, and an outer conductor is formed on an outer surface of the dielectric block, or a plurality of resonance electrodes are formed on one side of each. , And two dielectric substrates each having an earth electrode formed on the opposite surface.

FIGS. 5 and 6 show the structure of a conventional dielectric resonator using a dielectric block.

FIG. 5 is a perspective view of the entire appearance. In this example, four inner conductor forming holes H are provided inside the dielectric block 1, an inner conductor is formed on the inner surface thereof, and signal input / output terminals (not shown) are formed on the outer surface (six surfaces) of the dielectric block 1. The outer conductor 3 is formed on the entire surface except for the above.

Next, FIG. 6 shows a manufacturing method thereof. FIG. 6 is a vertical sectional view of a certain inner conductor forming hole in the dielectric resonator shown in FIG. FIG. 6A is a diagram showing a state before fine adjustment, and FIG. 6B is a diagram showing a state after fine adjustment. The inner conductor non-formed portion indicated by the length S is a rotating whetstone 4
It is formed by removing by means such as. When the characteristic of the dielectric resonator is adjusted, as shown in FIG. 6B, the inner peripheral surface of the inner conductor forming hole is cut together with the tip of the inner conductor 2 by the rotating grindstone 4 shown in FIG. As a result, the distance S 'between the resonance electrode 2 and the outer conductor-side electrode 8 is changed, the coupling coefficient between adjacent resonators and the resonance frequency are adjusted, and a dielectric resonator having predetermined characteristics is manufactured.

[0007]

However, in such a conventional dielectric resonator, the tip of the resonance electrode provided in the inner conductor forming hole is cut along the inner peripheral surface of the inner conductor forming hole. Since the distance between the tip of the resonance electrode and the outer conductor electrode also changes with the axial length of the resonance electrode, the coupling coefficient between adjacent resonators changes simultaneously with the resonance frequency, There is a problem that the characteristics of the period cannot be easily obtained.

An object of the present invention is to provide a dielectric resonator having excellent characteristics by adjusting a resonance frequency and a coupling coefficient substantially independently, and a method of manufacturing the same.

[0009]

According to the dielectric resonator of the present invention, a plurality of inner conductor forming holes each having an inner conductor formed on an inner surface are provided in a dielectric, and the dielectric resonator includes an opening surface of the inner conductor forming hole. In a dielectric resonator having an outer conductor formed on an outer surface of a body, a non-formed portion of the inner conductor is provided near an opening surface of the inner conductor forming hole and deeper than the opening surface, and the inner conductor is formed as an outer conductor. The outer electrode is separated into a side electrode and a resonance electrode, and a part of the outer conductor side electrode and / or the tip of the resonance electrode or a part near the tip is deleted in the axial direction of the inner conductor forming hole.

Further, in the method of manufacturing a dielectric resonator according to the present invention, a plurality of inner conductor forming holes each having an inner conductor formed on an inner surface are provided in a dielectric, and the dielectric including an opening surface of the inner conductor forming hole is provided. An outer conductor is formed on the outer surface of the inner conductor, and a non-formed portion of the inner conductor is provided near the opening surface of the inner conductor forming hole and at a position deeper than the opening surface to separate the inner conductor into an outer conductor side electrode and a resonance electrode. Then, the tip of the outer conductor-side electrode or a part near the tip is deleted in the axial direction of the inner conductor forming hole to adjust the coupling coefficient between the adjacent inner conductor forming hole and the resonance electrode, and The resonance frequency is adjusted by removing the front end portion or a part near the front end portion in the axial direction of the inner conductor forming hole, thereby manufacturing a dielectric resonator having predetermined characteristics.

[0011]

According to the dielectric resonator and the method of manufacturing the same of the present invention, the inner conductor is formed in the inner surface of the plurality of inner conductor forming holes near the opening surface of the inner conductor forming hole and deeper than the opening surface. A forming portion is provided, and the inner conductor is separated into an outer conductor-side electrode and a resonance electrode by the non-forming portion of the inner conductor. Then, the tip portion of the outer conductor side electrode and / or the resonance electrode or a part near the tip portion is deleted in the axial direction of the inner conductor forming hole. For example, by partially removing the tip portion or the vicinity of the tip portion of the outer conductor side electrode in the axial direction of the inner conductor forming hole, the capacitance (tip capacitance) between the outer conductor side electrode and the resonance electrode is reduced,
The coupling coefficient between adjacent resonators is adjusted. In addition, by removing the tip of the resonance electrode or the vicinity of the tip in the axial direction of the inner conductor forming hole, the tip capacitance does not change much, the equivalent resonator length of the resonance electrode changes, and the resonance frequency decreases. Adjusted. As described above, the coupling coefficient between the resonators and the resonance frequency are adjusted almost independently, so that a dielectric resonator having excellent characteristics can be easily obtained.

[0012]

1 to 3 show a structure of a dielectric resonator according to a first embodiment of the present invention.

FIG. 1 is a view in a state before fine adjustment.
FIG. 1B is a front view of the dielectric resonator, and FIG.
It is a horizontal sectional view in XX shown in (B). As described above, 2a, 2b, 2c, 2d, 8a, 8b, 8c, and 2a are provided on the inner surface of the inner conductor forming hole provided inside the dielectric block 1.
An inner conductor indicated by 8d is formed. 7a, 7b, 7c,
7d is an inner conductor non-formed portion. Of the inner conductors provided in the inner conductor forming hole, 2a, 2b, 2c and 2d function as resonance electrodes having the surface indicated by S as a short-circuit surface. Also, 8a, 8
b, 8c and 8d function as outer conductor side electrodes continuous with the outer conductor. In a dielectric resonator having such a structure,
The resonance frequency of the resonator is determined by the lengths L1 and L2 of the resonance electrodes, and the coupling coefficient between the adjacent resonators is determined by the lengths S1 and S2 of the portion where the inner conductor is not formed.

FIG. 2 is a partial horizontal sectional view showing the structure of the dielectric resonator shown in FIG. 1 in more detail. In the initial state, the inner conductor is formed on the entire inner peripheral surface of the inner conductor forming hole, and the outer conductor 3 is formed on the entire outer surface (six surfaces) of the dielectric block 1 except for the signal input / output electrodes (not shown). . Thereafter, a rotating grindstone is inserted from one opening surface of the inner conductor forming hole, and as shown in FIG. 2, the inner conductor is partially removed at a position deeper than the opening surface to provide a non-formed portion 7a of the inner conductor. . In the other inner conductor forming holes, the non-formed portions of the inner conductor are similarly provided. Then, measure the characteristics as a bandpass filter,
In order to obtain desired characteristics, the inner conductor non-formed portions 7a to 7d
Are adjusted to roughly adjust the resonance frequency and the coupling coefficient.

FIG. 3 shows a state after fine adjustment of the resonator using the resonance electrode 2a. As shown in FIG. 3, the tip of the resonance electrode 2a is partially removed in the axial direction of the inner conductor forming hole. Because of the partial deletion as described above, the interval S
The tip capacitance determined by 1 does not change much, the equivalent resonator length of the resonance electrode 2a changes, and the resonance frequency changes.

That is, as the axial removal distance d1 from the tip of the resonance electrode 2a is increased, the equivalent resonator length is shortened, and the resonance frequency is slightly increased. The resonance frequency is finely adjusted by the distance d1. Subsequently, the tip of the outer conductor side electrode 8a is partially deleted in the axial direction of the inner conductor forming hole. At this time, the resonator length of the resonance electrode 2a does not change, only the interval between the inner conductor non-formed portions 7a becomes equivalently longer, and the tip capacitance changes. Thereby, the coupling coefficient between adjacent resonators is finely adjusted.

Next, FIG. 4 shows the structure of a dielectric resonator according to a second embodiment. FIG. 4 is a view corresponding to the portion shown in FIG. 3, and is different from the first embodiment in that positions away from the tip are removed near the tips of the outer conductor side electrode and the resonance electrode. . Also in this case, the resonance frequency can be finely adjusted almost independently by deleting a portion near the tip of the resonance electrode 2a as shown by 5a, and a portion near the tip of the outer conductor side electrode 8a is shown by 6a. By thus partially deleting, the coupling coefficient with the adjacent resonator can be finely adjusted almost independently.

In each of the first and second embodiments, when the resonance frequency and the coupling coefficient are finely adjusted, the resonance electrode and the outer conductor-side electrode are deleted and the dielectric near the electrode is removed. The body may be deleted, and fine adjustment may be made by deleting the dielectric.

Further, in the first and second embodiments, an example is shown in which a single dielectric block is used to constitute a plurality of dielectric resonators. The same applies to a dielectric resonator integrated by joining two dielectric substrates each having a groove, an inner conductor formed on the inner surface thereof, and an outer conductor formed on the opposite surface side. Can be. Further, in each of the embodiments, the dielectric resonator acting as a comb-line type filter has been described as an example. However, an interdigital type can be similarly configured.

[0020]

According to the present invention, since the resonance frequency of each resonator and the coupling coefficient between the resonators can be adjusted independently, desired characteristics can be obtained with good reproducibility, and Is improved. Further, coarse adjustment is performed by providing a non-formed portion of the inner conductor, and fine adjustment is performed by deleting a part of the outer conductor side electrode and / or the resonance electrode at or near the front end in the axial direction of the inner conductor formation hole. Is performed, the adjustment efficiency is improved, and the time required for the characteristic adjustment can be shortened.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a structure of a dielectric resonator according to a first embodiment, wherein FIG. 1B is a front view, and FIG. 1A is a horizontal sectional view taken along line XX of FIG.

FIG. 2 is a partial horizontal sectional view of the dielectric resonator after a coarse adjustment according to the first embodiment.

FIG. 3 is a partial horizontal cross-sectional view of the dielectric resonator after fine adjustment according to the first example.

FIG. 4 is a partial horizontal sectional view of a dielectric resonator after fine adjustment according to a second embodiment.

FIG. 5 is an external perspective view of a conventional dielectric resonator.

FIG. 6 is a cross-sectional view illustrating a method for manufacturing a conventional dielectric resonator.

[Explanation of symbols]

 1-Dielectric block 2a-2d-Resonant electrode 3-Outer conductor 4-Rotating wheel 5a, 6a-Electrode removal part 7a-7d-Inner conductor non-forming part 8a-8d-Outer conductor side electrode H-Inner conductor forming hole

Continuation of the front page (72) Inventor Hisashi Mohri 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd. (56) References JP-A-4-372201 (JP, A) JP-A-5-183309 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01P 1/20-1/219

Claims (2)

(57) [Claims] 1. A dielectric comprising: a plurality of inner conductor forming holes each having an inner conductor formed in an inner surface thereof; and an outer conductor formed on an outer surface of the dielectric including an opening surface of the inner conductor forming hole. In the resonator, a non-forming portion of the inner conductor is provided near the opening surface of the inner conductor forming hole and at a position deeper than the opening surface, and the inner conductor is separated into an outer conductor-side electrode and a resonance electrode. A dielectric resonator, characterized in that the conductor-side electrode and / or a part of the resonance electrode at or near the tip is deleted in the axial direction of the inner conductor forming hole. 2. A plurality of inner conductor forming holes each having an inner conductor formed on an inner surface thereof are provided in a dielectric, and an outer conductor is formed on an outer surface of the dielectric including an opening surface of the inner conductor forming hole. A non-formed portion of the inner conductor is provided near the opening surface of the hole and deeper than the opening surface, the inner conductor is separated into an outer conductor side electrode and a resonance electrode, and a tip or a tip of the outer conductor side electrode is provided. A part near the portion is removed in the axial direction of the inner conductor forming hole to adjust the coupling coefficient of the adjacent inner conductor forming hole with the resonance electrode, and the tip of the resonance electrode or a portion near the tip is cut into the inner conductor. A method for manufacturing a dielectric resonator, wherein a resonance frequency is adjusted by removing a hole in an axial direction of a formation hole.