JPH07263912A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To form the dielectric resonator capable of facilitating band adjustment even after formation of a molding. CONSTITUTION:A molding 5 in columnar, e.g. in prismic shape made of dielectric materials and two through holes 6 and 7 piercing the molding 5 from the top to the bottom are provided. An outer peripheral electrode 5a coated with a conductor is provided on the outer peripheral face except the upper face of the molding 5, and inner peripheral electrodes 6a and 7a coated with conductors are provided on inner peripheral faces of two through holes 6 and 7. The outer peripheral electrode 5a in vicinities of coupling electrodes 9a and 9b is removed by a luter or the like to form a removal part A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator used for communication equipment and the like.

[0002]

2. Description of the Related Art A conventional dielectric resonator will be described below with reference to the drawings.

FIG. 11 is a perspective view of a conventional dielectric resonator. As shown in FIG. 11, the dielectric resonator is a molded body 1 made of a dielectric material and having a slit 3 in the center.
And two through holes 2 penetrating the upper surface and the lower surface of the molded body 1 on both sides of the slit 3. The molded body 1 has an outer peripheral electrode 1a on the outer peripheral surface and an inner peripheral electrode 2a on the inner peripheral surface of the through hole 2. Further, a coupling electrode 4 for an input / output electrode is provided on the side surface of the molded body 1 in the vicinity of the outer peripheral electrode 1a.

In this structure, the band of the dielectric resonator can be adjusted by changing the depth of the slit 3, and a desired band characteristic of the dielectric resonator can be obtained.

[0005]

In the above configuration, normally,
Since the molded body 1 is formed by firing, volume contraction occurs during firing, and the depth of the slit 3 changes. That is, the depth of the slit 3 is determined at the time of molding when the molded body 1 is fired and molded, and after the molding, the depth of the slit 3 cannot be changed due to the material characteristics of the dielectric resonator.

Therefore, if the band of the dielectric resonator is not proper at the time of molding the molded body 1, the band cannot be adjusted and the yield of the dielectric resonator is deteriorated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a dielectric resonator in which the band of the dielectric resonator can be easily adjusted even after the molded body 1 is molded. To do.

[0008]

In order to achieve the above object, in the dielectric resonator of the present invention, the outer peripheral electrode in the vicinity of the coupling electrode is removed.

[0009]

In the above structure, since the capacitance between the coupling electrode and the outer peripheral electrode changes according to the distance between the coupling electrode and the outer peripheral electrode, it is possible to remove the outer peripheral electrode near the coupling electrode even after the molding of the molded body. If so, the bandwidth of the dielectric resonator can be easily adjusted.

[0010]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a dielectric resonator according to a first embodiment of the present invention, FIG. 2 is a dielectric resonator equivalent circuit diagram, and FIG. 3 is a resonator waveform diagram of the dielectric resonator.

As shown in FIG. 1, the dielectric resonator has a columnar shaped body 5 made of a dielectric material, for example, a prismatic shape, and two through holes 6 and 7 penetrating the upper and lower surfaces of the shaped body 5. Have Further, an outer peripheral electrode 5a formed by coating a conductor on the outer peripheral surface excluding the upper surface of the molded body 5 has two through holes 6,
Inner peripheral electrodes 6 each having an inner peripheral surface coated with a conductor
a and 7a. At this time, the outer peripheral electrode 5a, the inner peripheral electrode 6a, and the inner peripheral electrode 7a are electrically connected to each other on the lower surface of the molded body 5. Further, two island-shaped coupling electrodes 9a and 9b for input and output are provided on the side surface of the molded body 5 by removing a part of the ground electrode 5a. Then, the outer peripheral electrode 5a near the coupling electrodes 9a and 9b is removed by a lutor or the like, and A is a removal portion thereof.

The equivalent circuit of the dielectric resonator at this time is the circuit shown in FIG. 2, 11 is the resonance part of the dielectric resonator, 12a is the capacitance part between the inner peripheral electrode 6a and the coupling electrode 9a,
12b is a capacitance portion between the inner peripheral electrode 7a and the coupling electrode 9b, 13
Reference numeral a is a capacitance portion between the coupling electrode 9a and the outer peripheral electrode 5a, 13b is a capacitance portion between the coupling electrode 9b and the outer peripheral electrode 5a, and 14 is an input / output terminal composed of the coupling electrodes 9a and 9b.

With this structure, even after the molded body 5 is molded,
Peripheral electrode 5a near coupling electrode 9a or coupling electrode 9b
If a removing unit A is provided by removing the band with a louter or the like, the band of the dielectric resonator can be adjusted according to the position or area where the removing unit A is provided, and the band characteristic of the desired dielectric resonator can be adjusted. Can be obtained.

As shown in FIG. 3, the band characteristic at this time is changed from the unadjusted resonator waveform 15a to the adjusted resonator waveform 15b, and the band characteristic is widened.

As described above, in the dielectric resonator according to the first embodiment, the coupling electrode 9a or the peripheral electrode 5a in the vicinity of the coupling electrode 9b is removed with a lutor or the like to remove the removed portion A even after the molded body 5 is molded. If provided, the dielectric resonator band can be adjusted according to the position or area where the removing portion A is provided, and desired band characteristics of the dielectric resonator can be obtained.

In this embodiment, the two-stage dielectric resonator having the two through holes 6 and 7 has been described, but the same effect can be obtained even with the dielectric resonator having three or more through holes. it can.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view of a dielectric resonator according to the second embodiment of the present invention, FIG. 5 is a perspective view of a two-stage dielectric resonator in which two dielectric resonators are coupled, and FIG. a) is an equivalent circuit diagram of the dielectric resonator shown in FIG. 4, FIG. 6B is an equivalent circuit diagram of the two-stage dielectric resonator shown in FIG. 5, and FIG. 7 is two stages shown in FIG. It is a characteristic view of the dielectric resonator of.

As shown in FIG. 4, the dielectric resonator has a columnar, for example, prismatic shaped body 16 made of a dielectric material, and one through hole 17 penetrating the upper and lower surfaces of the shaped body 16. ing. Further, the outer peripheral surface of the molded body 16 excluding the upper surface is provided with an outer peripheral electrode 16a covered with a conductor,
Inner peripheral electrodes 17 each having a conductor coated on the inner peripheral surface of the
a. At this time, the outer peripheral electrode 16a and the inner peripheral electrode 1
7a is electrically connected to the lower surface of the molded body 16. Further, on the side surface of the molded body 16, a part of the ground electrode 16a is removed at two places, and the coupling electrode 1 for input and output is provided for each.
9a or coupling electrode 19b is provided. Then, the outer peripheral electrode 16a in the vicinity of the coupling electrodes 19a and 19b is removed by a lutor or the like to form the removed portion A.

Further, the two-stage dielectric resonator shown in FIG.
The two dielectric resonators X and Y shown in FIG. 4 are coupled to each other. The coupling electrode 19b of the dielectric resonator X and the dielectric resonator Y are coupled to each other.
It is electrically connected by the coupling electrode 19a of FIG.

The equivalent circuits of the dielectric resonator and the two-stage dielectric resonator at this time are shown in FIG. 6 (a) and FIG.
The circuit shown in (b) is obtained.

An equivalent circuit of the dielectric resonator shown in FIG. 4 shown in FIG. 6A will be described. Reference numeral 21 is a resonator portion of the dielectric resonator, and 2
2a is a capacitance portion between the inner peripheral electrode 17a and the coupling electrode 19a, 2
2b is a capacitance portion between the inner peripheral electrode 17a and the coupling electrode 19b, 2
3a is a capacitance portion between the coupling electrode 19a and the outer peripheral electrode 16a, 2
3b is a capacitance portion between the coupling electrode 19b and the outer peripheral electrode 16a, 2
Reference numeral 6 is an input / output terminal composed of coupling electrodes 19a and 19b.

An equivalent circuit of the two-stage dielectric resonator of FIG. 5 shown in FIG. 6B will be described. 21 is a resonance portion of the dielectric resonator, 22a is a capacitance between the inner peripheral electrode 17a and the coupling electrode 19a. , 22b is a capacitance between the inner electrode 17a and the coupling electrode 19b, 23a is a capacitance between the coupling electrode 19a and the outer electrode 16a, 23b is a capacitance between the coupling electrode 19b and the outer electrode 16a, and 26 is dielectric resonance. Input and output terminals consisting of a coupling electrode 19a of the container X and a coupling electrode 19b of the dielectric resonator Y, 2
Reference numeral 7 denotes an electrical junction between the coupling electrode 19b of the dielectric resonator X and the coupling electrode 19a of the dielectric resonator.

With this structure, the dielectric resonator shown in FIG. 4 and the two-stage dielectric resonator shown in FIG.
Even after the molding of 6, the coupling electrode 19a or the coupling electrode 19b
By removing the outer peripheral electrode 16a in the vicinity of the area with a louter or the like to provide the removed portion A, the band of the dielectric resonator can be adjusted according to the position or area where the removed portion A is provided, and the desired dielectric The band characteristic of the body resonator can be obtained.

As shown in FIG. 7, the band characteristic at this time is changed from the unadjusted resonator waveform 25a to the adjusted resonator waveform 25b, and the band characteristic is widened.

As described above, in the dielectric resonator according to the second embodiment, even after the molded body 16 is molded, the outer peripheral electrode 16a in the vicinity of the coupling electrode 19a or the coupling electrode 19b is removed by a luter or the like to remove the removed portion A. If provided, the band of the dielectric resonator can be adjusted according to the position or area where the removing portion A is provided, and desired band characteristics of the dielectric resonator can be obtained.

In the first and second embodiments, the molded body is provided with a through hole, and the inner peripheral electrode formed by covering the inner peripheral surface of the through hole with a conductor and the upper surface of the molded body are excluded. The outer surface is electrically connected to the outer peripheral electrode formed by coating the conductor on the lower surface. However, a non-through hole is provided in the molded body from the upper surface to the vicinity of the lower surface, and the inner peripheral surface of the non-through hole is formed. The same effect can be obtained by electrically connecting the inner electrode formed by coating the conductor on the upper surface of the molded body and the ground electrode formed by coating the outer surface of the molded body on the outer surface excluding the lower surface of the molded body. Can be obtained.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 8 is a perspective view of a dielectric resonator according to the third embodiment of the present invention, FIG. 9 is an equivalent circuit diagram of the dielectric resonator, and FIG. 10 is a characteristic diagram of the dielectric resonator.

As shown in FIG. 8, the dielectric resonator is substantially the same as the dielectric resonator shown in FIG. 4 described in the second embodiment.

The dielectric resonator is a column made of a dielectric material,
For example, it has a prismatic shaped body 16 and one through hole 17 penetrating the upper and lower surfaces of the shaped body 16. Further, the outer peripheral surface of the molded body 16 excluding the upper surface is provided with an outer peripheral electrode 16a covered with a conductor, and the inner peripheral surface of the through hole 17 is provided with an inner peripheral electrode 17a covered with a conductor. Body 1
On the upper surface of 6, there is provided an electrode 28 that is electrically connected to the inner peripheral electrode 17a of the through hole 17 and is covered with a conductor so as not to be electrically connected to the outer peripheral electrode 16a to reduce the resonator length. is doing. At this time, the inner electrode 17a and the outer electrode 16a
Are electrically connected to the lower surface of the molded body 16. Further, on the side surface of the molded body 16, a part of the outer peripheral electrode 16a is removed and an input / output coupling electrode 19 is provided. The outer peripheral electrode 16a in the vicinity of the coupling electrode 19 is removed with a lutor or the like to form the removed portion A.

The equivalent circuit of the dielectric resonator at this time is the circuit shown in FIG. 9, where 21 is the resonance part of the dielectric resonator, 22 is the capacitance part between the inner peripheral electrode 17a and the coupling electrode 19, and
Reference numeral 23 denotes a capacitance portion between the coupling electrode 19 and the outer peripheral electrode 16a, and 26
Is an input / output terminal composed of a coupling electrode 19.

With this configuration, even after the molded body 16 is molded, if the outer peripheral electrode 16a in the vicinity of the coupling electrode 19 is removed with a lutor or the like to provide the removed portion A, the position or area where the removed portion A is provided is set. The band of the dielectric resonator can be adjusted accordingly, and a desired band characteristic of the dielectric resonator can be obtained.

Further, as shown in FIG. 10, the band characteristic at this time changes from the resonator waveform 27a before adjustment to the resonator waveform 27b after adjustment, and the band characteristic broadens.

As described above, in the dielectric resonator of the third embodiment, even after the molded body 16 is molded, the outer peripheral electrode 16a in the vicinity of the coupling electrode 19 is removed with a louter or the like to provide the removed portion A. The dielectric resonator band can be adjusted according to the position or area where the removing portion A is provided, and desired band characteristics of the dielectric resonator can be obtained.

In this embodiment, the electrode 28 provided on the upper surface of the molded body 16 can obtain the same effect whether the through hole 17 is closed or not.

[0038]

As described above, according to the present invention, the capacitance between the coupling electrode and the outer peripheral electrode changes according to the distance between the coupling electrode and the outer peripheral electrode. By removing the peripheral electrode in the vicinity, the band of the dielectric resonator can be easily adjusted, and the desired dielectric resonator band characteristic can be obtained according to the area of the removed part of the peripheral electrode. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a dielectric resonator according to a first embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of the dielectric resonator.

FIG. 3 is a characteristic diagram of the dielectric resonator.

FIG. 4 is a perspective view of a dielectric resonator according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a two-stage dielectric resonator in which two dielectric resonators are coupled.

6A is an equivalent circuit diagram of the dielectric resonator shown in FIG. 4, and FIG. 6B is an equivalent circuit diagram of the two-stage dielectric resonator shown in FIG.

7 is a characteristic diagram of the two-stage dielectric resonator shown in FIG.

FIG. 8 is a perspective view of a dielectric resonator according to a third embodiment of the present invention.

FIG. 9 is an equivalent circuit diagram of the dielectric resonator.

FIG. 10 is a characteristic diagram of the same dielectric resonator.

FIG. 11 is a perspective view of a conventional dielectric resonator.

[Explanation of symbols]

 5 molded body 5a outer peripheral electrode 6 through hole 6a inner peripheral electrode 7 through hole 7a inner peripheral electrode 9a coupling electrode 9b coupling electrode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Miyake 55-12 Hama Ozumi, Tanabe-cho, Tsuzuki-gun, Kyoto Pref. 55-12 Matsushita Nitto Electric Co., Ltd.

Claims (3)

[Claims] 1. A columnar molded body made of a dielectric material, a through hole penetrating the upper and lower surfaces of the molded body, an inner peripheral electrode covering the inner peripheral surface of the through hole, and an upper surface of the molded body. In the dielectric resonator having an outer peripheral electrode that is electrically connected to the inner peripheral electrode and a coupling electrode that is provided in the vicinity of the outer peripheral electrode while covering the outer peripheral surface except for, in the vicinity of the coupling electrode. A dielectric resonator from which the outer peripheral electrode is removed. 2. The upper surface of the molded body is covered with a conductor, the inner circumference of the conductor is electrically connected to the inner circumference electrode, and the outer circumference of the conductor is in a non-electrically connected state with the outer circumference electrode. The dielectric resonator according to claim 1. 3. A columnar molded body made of a dielectric material, a non-through hole provided from the upper surface to the lower surface of the molded body, an inner peripheral electrode covering an inner peripheral surface of the non-through hole, and the molded body. A dielectric resonator having an outer peripheral electrode that covers the outer peripheral surface except the lower surface of the body and is electrically connected to the inner peripheral electrode, and a coupling electrode provided in the vicinity of the outer peripheral electrode, wherein the coupling electrode A dielectric resonator in which the outer peripheral electrode in the vicinity of is removed.