JP2003115709A - Laminated dielectric resonator and laminated dielectric filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To advance miniaturization of a resonator by conventionally employing the fold back structure of a resonance electrode. SOLUTION: A resonance electrode 16 is formed on a plane approximately at a middle height in a dielectric board (e.g. a main plane of a fifth dielectric layer S5) and has a short-circuited end 18 connected at one end to a ground electrode 12a formed on one side of the board, a first open end 20 formed on a plane in the board (e.g. one main plane of a second dielectric layer S2) near a ground electrode 12a formed on the upside of the board, and a second open end 22 formed on a plane in the board (e.g. one main plane of an eighth dielectric layer S8) near a ground electrode 12b formed on the downside of the dielectric board.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to several hundred MHz to several G.
Regarding a laminated dielectric resonator and a laminated dielectric filter that form a resonance circuit in the microwave band of Hz,
The present invention relates to a laminated dielectric resonator and a laminated dielectric filter which can suppress manufacturing variations and can realize miniaturization and high yield of a laminated dielectric filter and the like.

[0002]

2. Description of the Related Art Recently, with the diversification of wireless communication systems such as mobile phones, there has been an increasing demand for miniaturization and loss reduction of laminated dielectric filters.

In order to realize the miniaturization of the laminated dielectric filter, the dielectric substrate itself must be made small.

When the size of the dielectric substrate is reduced, the length of the resonance electrode formed inside becomes insufficient. Therefore, by dividing the resonance electrode formed inside the dielectric substrate into two parts and connecting them through via holes, An example in which the resonance electrode is folded back has been proposed (for example, JP-A-11-191702).
JP-A-10-126103, JP-A-10-126103
-190308).

[0005]

However, there is a great demand for miniaturization of the laminated dielectric filter, and there is a limit to the miniaturization of the laminated dielectric filter only by the folded structure of the resonance electrode.

The present invention has been made in view of the above problems, and it is possible to further reduce the size while following the folded structure of the resonance electrode. It is intended to provide a body filter.

[0007]

In a laminated dielectric resonator according to the present invention, a ground electrode is formed on the surface of a dielectric substrate formed by laminating a plurality of dielectric layers. In the laminated dielectric resonator having one or more resonance electrodes, the resonance electrode is formed of a short-circuited end portion connected to a ground electrode formed on one side surface of the dielectric substrate, and the resonance electrode in the dielectric substrate. A first open end portion formed near the upper surface of the dielectric substrate and a second open end portion formed inside the dielectric substrate near the lower surface of the dielectric substrate. Characterize.

As a result, since the first and second open end portions are located near the upper surface and the lower surface of the dielectric substrate, respectively, there is a static gap between the first open end portion and the ground electrode on the upper surface side. The capacitance is formed, and the capacitance is formed between the second open end portion and the ground electrode on the lower surface side, so that the electrostatic capacitance formed between the ground electrode and the open end of the resonance electrode is formed. The electric capacity can be increased. This leads to a reduction in resonance frequency.

As described above, according to the present invention, the capacitance can be increased even if the size of the dielectric substrate itself is reduced in accordance with the demand for miniaturization of the multilayer dielectric resonator or the multilayer dielectric filter. The resonance frequency can be reduced.

In the above structure, the short-circuited end portion and the first and second open end portions may be electrically connected by a via hole. Further, each open end of the first and second open end portions may be formed in the dielectric substrate so as to face the one side surface of the dielectric substrate. That is, a folded structure of the resonance electrode can be adopted.

The width of at least one of the first and second open end portions may be set larger than the width of the short-circuited end portion. Thereby, the capacitance between the open end of the resonance electrode and the ground electrode can be further increased, and the reduction of the resonance frequency can be promoted.

Further, the inner layer ground electrode facing at least one open end portion of the first and second open end portions may be formed. Also in this case, the capacitance between the open end of the resonance electrode and the ground electrode can be further increased.

If the short-circuited end portion is composed of a plurality of strip lines arranged in the stacking direction, one resonator is substantially composed of a plurality of resonance electrodes. The unloaded Q value can be improved.

Next, in the laminated dielectric filter according to the present invention, a ground electrode is formed on the surface of a dielectric substrate formed by laminating a plurality of dielectric layers, and 2
In the laminated dielectric filter having the above resonator,
Each of the resonators has at least one resonance electrode, and the resonance electrode includes a short-circuited end portion connected to a ground electrode formed on one side surface of the dielectric substrate, and a portion inside the dielectric substrate.
A first open end portion formed in the vicinity of the upper surface of the dielectric substrate, and a second open end portion formed in the dielectric substrate in the vicinity of the lower surface of the dielectric substrate. And

As a result, the capacitance can be increased and the resonance frequency can be lowered even if the size of the dielectric substrate itself is set small in accordance with the demand for miniaturization of the multilayer dielectric resonator or the multilayer dielectric filter. Can be planned. this is,
This leads to promotion of miniaturization of the laminated dielectric filter.

In the laminated dielectric filter, one or more coupling adjusting electrodes for adjusting the degree of coupling between the resonators may be provided. In this case, the coupling capacitance can be increased by forming the coupling adjustment electrode at a position close to at least one of the first and second open end portions.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a laminated dielectric resonator and a laminated dielectric filter according to the present invention will be described below with reference to FIG.
-It demonstrates, referring FIG.

First, the laminated dielectric resonator 10A according to the first embodiment is, for example, as shown in FIGS.
A plurality of dielectric layers (first to ninth dielectric layers S1 to S9) are stacked, fired and integrated, and ground electrodes 12a to 12 are formed on the surface.
It has a dielectric substrate 14 on which c is formed. The ground electrode 12b on the lower surface side is formed not on the lower surface of the dielectric substrate 14 but on one main surface (upper surface) of the ninth dielectric layer S9. In addition, when the earth electrode is collectively referred to as an earth electrode 12.

In FIG. 2, the first to ninth dielectric layers S1 to S are formed.
An example in which the dielectric substrate 14 is formed by sequentially stacking 9 layers will be shown.
The number of stacked first to ninth dielectric layers S1 to S9 is merely an example, and the first to ninth dielectric layers S1 are
Each of S9 to S9 is composed of one or more layers.

The laminated dielectric resonator 10A according to the first embodiment has a resonance electrode 16 formed in the dielectric substrate 14.

The resonance electrode 16 is formed on a plane (for example, one main surface of the fifth dielectric layer S5) substantially at the center in the height direction within the dielectric substrate 14 (see FIG. 1), and one end thereof is made of a dielectric material. The short-circuited end portion 18 connected to the ground electrode 12c (see FIG. 1) formed on one side surface of the substrate 14 and the ground electrode 12a formed on the upper surface of the dielectric substrate 14 in the dielectric substrate 14 A first open end portion 20 formed on an adjacent plane (for example, one main surface of the second dielectric layer S2) and a ground formed on the lower surface of the dielectric substrate 14 in the dielectric substrate 14. The second open end portion 22 formed on a plane (for example, one main surface of the eighth dielectric layer S8) close to the electrode 12b.
And is configured.

The end of the short-circuited end portion 18 (the end opposite to the short-circuited end) and one end of the first open end portion 20 are electrically connected to each other through the via hole 24, and the short-circuited end is formed. The end of the portion 18 and one end of the second open end portion 22 are also electrically connected via the via hole 24.

Further, the first and second open end portions 20 and 22 are formed in the dielectric substrate 14 such that the open ends 20a and 22a face the ground electrode 12c on the one side surface of the dielectric substrate 14. Has been done. That is, the resonance electrode 16
Has a structure in which it is separated into two forks from the middle and folded back.

As described above, in the laminated dielectric resonator 10A according to the first embodiment, the short-circuited end portion 18 is formed at the center of the dielectric substrate 14 in the height direction, and the resonance electrode 16 is formed.
The open end portions 20 and 22 of the dielectric substrate 14 respectively.
Since it is located near the upper surface and near the lower surface, a capacitance C1 is formed between the first open end portion 20 and the ground electrode 12a on the upper surface side, and the second open end portion 22 and the lower surface are formed. Since the capacitance C2 is formed between the ground electrode 12b on the side and the ground electrode 12b on the side, the capacitance formed between the ground electrode 12 and the open end of the resonance electrode 16 can be increased. This leads to a reduction in resonance frequency.

That is, in the first embodiment, the capacitance is increased even if the size of the dielectric substrate 14 itself is set small in accordance with the demand for miniaturization of the multilayer dielectric resonator or the multilayer dielectric filter. It is possible to reduce the resonance frequency.

Next, the laminated dielectric resonator 10B according to the second embodiment will be described with reference to FIG.

As shown in FIG. 3, the laminated dielectric resonator 10B according to the second embodiment has substantially the same structure as the laminated dielectric resonator 10A according to the first embodiment described above. With the width W1 of the first open end portion 20 and the second
The width W2 of the open end portion 22 of the
The difference is that it is set larger than.

In this case, the capacitance between the open end of the resonance electrode 16 and the ground electrode 12 can be further increased, and the reduction of the resonance frequency can be promoted.

Next, a laminated dielectric resonator 10C according to the third embodiment will be described with reference to FIGS. 4 and 5.

As shown in FIGS. 4 and 5, the laminated dielectric resonator 10C according to the third embodiment is substantially the same as the laminated dielectric resonator 10A according to the first embodiment described above. Although having the same structure, a first inner layer ground electrode 30 facing the first open end portion 20 is formed on one main surface of the third dielectric layer S3, and one main surface of the seventh dielectric layer S7 is formed. The difference is that a second inner layer ground electrode 32 facing the second open end portion 22 is formed on the surface.

In this case, the capacitance formed between the first open end portion 20 and the first inner layer ground electrode 30 is added to the capacitance formed between the first open end portion 20 and the ground electrode 12a on the upper surface side. Further, since the second open end portion 22 is added with the capacitance formed between the second inner layer ground electrode 32 and the capacitance formed between the second open end portion 22 and the ground electrode 12b on the lower surface side, The capacitance between the open end of the resonance electrode 16 and the ground electrode 12 can be further increased.

In particular, the open ends 20a and 22a of the first and second open end portions 20 and 22, respectively, are first and second.
The ground electrode 1 rather than the end of the inner layer ground electrodes 30 and 32 facing the ground electrode 12c on the one side surface.
By forming it closer to 2c, the facing area between the first open end portion 20 and the first inner-layer ground electrode 30 and the second open end portion 22 and the second open end portion 2 No variation occurs in the area facing the inner-layer ground electrode 32, and the variation in characteristics can be suppressed.

Next, a laminated dielectric resonator 10D according to a fourth embodiment will be described with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, the laminated dielectric resonator 10D according to the fourth embodiment is substantially the same as the laminated dielectric resonator 10A according to the first embodiment described above. It has the same structure, but is different in that the short-circuited end portion 18 is composed of a plurality of strip lines (first to third strip lines 18a to 18c) arranged in the stacking direction.

In the example of FIG. 7, the first strip line 1
8a is formed on one main surface of the fourth dielectric layer S4, the second strip line 18b is formed on one main surface of the fifth dielectric layer S5, and the third strip line 18c is formed on the sixth dielectric layer S5. The first to third strip lines 18a to 18c are formed on one main surface of the body layer S6, and the ends of the first to third strip lines 18a to 18c are electrically connected to each other through the via hole 24.

Generally, the unloaded Q value is higher when the resonator is composed of a plurality of resonance electrodes than when the resonator is composed of a resonance electrode.

Therefore, in the laminated dielectric resonator 10D according to the fourth embodiment, one resonator is substantially constituted by a plurality of resonance electrodes, and therefore the unloaded Q value is reduced. It is possible to improve.

Next, an example in which a laminated dielectric filter 100 having a two-stage structure is constructed by using the laminated dielectric resonator 10A according to the above-described first embodiment will be described with reference to FIG.

This laminated dielectric filter 100 has a first
The resonance electrode 16A constitutes a first resonator, and the second resonance electrode 16B constitutes a second resonator. Therefore, reference numerals of various electrodes corresponding to the first resonance electrode 16A are denoted by A, reference numerals of various electrodes corresponding to the second resonance electrode 16B are denoted by B, and duplicate description of these electrodes is omitted. To do.

Here, the structure peculiar to the laminated dielectric filter 100 will be described. One of the short-circuited end portions 18A.
Has a lead electrode 4 connected to an input terminal (not shown).
0 is formed, and a lead electrode 42 connected to an output terminal (not shown) is formed on the other short-circuit end portion 18B.

Further, the resonance electrode 16A is provided on one main surface of the fourth dielectric layer S4 adjacent to the short-circuited end portions 18A and 18B.
And adjusting electrode 4 for adjusting the degree of coupling between 16B and 16B
4 are formed.

This two-stage laminated dielectric filter 10
In 0, since the structure is made by utilizing the structure of the laminated dielectric resonator 10A according to the first embodiment described above, the laminated dielectric resonator and the laminated dielectric filter are downsized. According to requirements, even if the size of the dielectric substrate 14 itself is set small, the capacitance can be increased and the resonance frequency can be lowered. This leads to promotion of miniaturization of the laminated dielectric filter 100.

Next, the laminated dielectric filter 100 described above is used.
A modified example will be described with reference to FIG.

Multilayer dielectric filter 1 according to this modification
As shown in FIG. 9, 00a has substantially the same structure as the above-mentioned laminated dielectric filter 100, but one main surface of the third dielectric layer S3 adjacent to the first open end portions 20A and 20B. A first coupling adjustment electrode 44 for adjusting the degree of coupling between the resonance electrodes 16A and 16B is formed on the first main surface of the seventh dielectric layer S7 adjacent to the second open end portions 22A and 22B. In addition, a second coupling adjustment electrode 46 for adjusting the coupling degree between the resonance electrodes 16A and 16B is formed.

Multilayer dielectric filter 1 according to this modification
00a, the first and second open end portions (20
A, 20B) and (22A, 22B) are formed adjacent to the coupling adjustment electrodes 44 and 46, respectively, so that the coupling capacitance can be increased.

The laminated dielectric resonator and the laminated dielectric filter according to the present invention are not limited to the above-mentioned embodiments, and various structures can be adopted without departing from the gist of the present invention. Of course.

[0047]

As described above, according to the laminated dielectric resonator and laminated dielectric filter of the present invention, the miniaturization can be promoted while following the folded structure of the resonance electrode. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a laminated dielectric resonator according to a first embodiment.

FIG. 2 is an exploded perspective view showing the laminated dielectric resonator according to the first embodiment.

FIG. 3 is an exploded perspective view showing a laminated dielectric resonator according to a second embodiment.

FIG. 4 is a longitudinal sectional view showing a laminated dielectric resonator according to a third embodiment.

FIG. 5 is an exploded perspective view showing a laminated dielectric resonator according to a third embodiment.

FIG. 6 is a longitudinal sectional view showing a laminated dielectric resonator according to a fourth embodiment.

FIG. 7 is an exploded perspective view showing a laminated dielectric resonator according to a fourth embodiment.

FIG. 8 is an exploded perspective view showing a laminated dielectric filter according to the present embodiment.

FIG. 9 is an exploded perspective view showing a modified example of the laminated dielectric filter according to the present embodiment.

[Explanation of symbols]

10A to 10D ... Laminated dielectric resonator 12 ... Ground electrode 12a ... Top side ground electrode 12b ... Bottom side ground electrode 12c ... One side ground electrode 14 ... Dielectric substrate 16, 16A, 16B ... Resonance electrode 18, 18
A, 18B ... Short-circuited end portions 18a-18c ... First to third strip lines 20, 20A, 20B ... First open end portions 22, 22A, 22B ... Second open end portion 24 ... Via hole 30 ... First Inner layer ground electrode 32 ... Second inner layer ground electrodes 100, 100a ... Multilayer dielectric filter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tainobu Saka             2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi             Inside Hon insulator Co., Ltd. (72) Inventor Takami Hirai             2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi             Inside Hon insulator Co., Ltd. (72) Inventor Kazuyuki Mizuno             2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi             Inside Hon insulator Co., Ltd. (72) Inventor Goji Noguchi             664-1 Sarukubo, Saku City, Nagano Prefecture Soshin Electric Co., Ltd.             Ceremony Company Chikuma Factory F term (reference) 5J006 HB05 HB13 HB22 JA01 LA22                       LA23 NA03 NB07 NC03

Claims (8)

[Claims] 1. A laminated dielectric resonator in which a ground electrode is formed on the surface of a dielectric substrate formed by laminating a plurality of dielectric layers and one or more resonance electrodes are provided in the dielectric substrate. The resonance electrode has a short-circuited end portion connected to a ground electrode formed on one side surface of the dielectric substrate, and a first opening formed in the dielectric substrate near an upper surface of the dielectric substrate. A laminated dielectric resonator having an end portion and a second open end portion formed in the dielectric substrate in the vicinity of a lower surface of the dielectric substrate. 2. The laminated dielectric resonator according to claim 1, wherein the short-circuited end portion and the first and second open end portions are electrically connected by a via hole. Multilayer dielectric resonator. 3. The laminated dielectric resonator according to claim 1, wherein the first and second open end portions are arranged so that each open end faces the one side surface of the dielectric substrate. A laminated dielectric resonator formed in a dielectric substrate. 4. The laminated dielectric resonator according to claim 1, wherein at least one of the first and second open end portions has a width of at least one of the open end portions. A laminated dielectric resonator characterized in that the width is set larger than the width of the short-circuited end portion. 5. The laminated dielectric resonator according to claim 1, wherein an inner layer earth facing at least one open end portion of the first and second open end portions. A laminated dielectric resonator having electrodes formed thereon. 6. The laminated dielectric resonator according to claim 1, wherein the short-circuited end portion is composed of a plurality of strip lines arranged in the stacking direction. And a laminated dielectric resonator. 7. A laminated dielectric filter having a ground electrode formed on a surface of a dielectric substrate formed by laminating a plurality of dielectric layers and having two or more resonators in the dielectric substrate, Each resonator has one or more resonance electrodes, and the resonance electrodes include a short-circuited end portion connected to a ground electrode formed on one side surface of the dielectric substrate, and the resonance electrode in the dielectric substrate. A first open end portion formed near the upper surface of the dielectric substrate, and a second open end portion formed near the lower surface of the dielectric substrate in the dielectric substrate. Multilayer type dielectric filter. 8. The laminated dielectric filter according to claim 7, further comprising one or more coupling adjustment electrodes for adjusting the degree of coupling between the resonators, wherein the first and second open end portions include: A multilayer dielectric filter, wherein the coupling adjustment electrode is formed at a position close to at least one open end portion.