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JP2661005B2 - Dielectric filter - Google Patents

Dielectric filter

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Publication number
JP2661005B2
JP2661005B2 JP4186100A JP18610092A JP2661005B2 JP 2661005 B2 JP2661005 B2 JP 2661005B2 JP 4186100 A JP4186100 A JP 4186100A JP 18610092 A JP18610092 A JP 18610092A JP 2661005 B2 JP2661005 B2 JP 2661005B2
Authority
JP
Japan
Prior art keywords
dielectric
resonators
conductor
bonding
dielectric substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP4186100A
Other languages
Japanese (ja)
Other versions
JPH066107A (en
Inventor
智 三好
明司 宮下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toko Inc
Original Assignee
Toko Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toko Inc filed Critical Toko Inc
Priority to JP4186100A priority Critical patent/JP2661005B2/en
Publication of JPH066107A publication Critical patent/JPH066107A/en
Application granted granted Critical
Publication of JP2661005B2 publication Critical patent/JP2661005B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、誘電体フィルタの構造
に係るもので、特にその共振器間の容量性の結合を得る
ための電極構造に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a dielectric filter, and more particularly to an electrode structure for obtaining capacitive coupling between resonators.

【0002】[0002]

【従来の技術】UHF帯からマイクロ波帯と言った高周
波領域において各種の誘電体フィルタが用いられてい
る。その中でも、貫通孔を具えてその部分に内導体が形
成され、外周面に外導体が形成されたTEM共振器を組
み合わせた誘電体フィルタが多く用いられている。個別
の共振器を接続して構成するものと、ブロックに一体化
されたものとがある。
2. Description of the Related Art Various dielectric filters are used in a high frequency range from the UHF band to the microwave band. Among them, a dielectric filter including a TEM resonator in which an inner conductor is formed in a portion having a through hole and an outer conductor is formed on an outer peripheral surface thereof is often used. There are a resonator configured by connecting individual resonators and a resonator integrated with a block.

【0003】それらの誘電体フィルタにおいては、通過
帯域特性を調整するために、共振器間の容量性の結合、
誘導性の結合を調整している。容量性の結合を強めるた
めには、共振器間にコンデンサを接続したり、共振器の
内導体から開放端面に引き出した導体パターンを対向さ
せて形成して容量を得たりしている。
In these dielectric filters, in order to adjust the pass band characteristics, capacitive coupling between resonators,
Regulates inductive binding. In order to strengthen the capacitive coupling, a capacitor is connected between the resonators, or a conductor pattern drawn from the inner conductor of the resonator to the open end face is formed so as to be opposed to obtain a capacitance.

【0004】誘電体フィルタの分野でも、小型化、薄型
化の要求があり、また、周波数帯の上昇に伴い波長が短
くなるために寸法も短くしなければならない。
In the field of dielectric filters, there is also a demand for miniaturization and thinning, and the size must be shortened because the wavelength becomes shorter as the frequency band rises.

【0005】[0005]

【発明が解決しようとする課題】上記のように、小型
化、薄型化が進むと、共振器間の容量性の結合を得るた
めの構造も制約されることになり、簡単な構造で必要十
分な容量性の結合を得ることのできる電極構造が必要と
なる。
As described above, as the size and thickness are reduced, the structure for obtaining the capacitive coupling between the resonators is restricted, and a simple structure is necessary and sufficient. An electrode structure that can obtain a high capacitive coupling is required.

【0006】また、共振器間の容量性の結合を得るため
に、特別な部品を付加したり接続することは避けること
が望ましい。
It is also desirable to avoid adding or connecting special components to obtain capacitive coupling between the resonators.

【0007】本発明は、このような課題を解決して、簡
単な構造、製造工程で、十分な容量性の結合の得られる
誘電体フィルタを提供するものである。
An object of the present invention is to provide a dielectric filter which solves such a problem and has sufficient capacitance coupling with a simple structure and a simple manufacturing process.

【0008】[0008]

【課題を解決するための手段】本発明は、誘電体ブロッ
クの内部に、内導体に接続された導体膜を配置し、この
導体膜によって共振器の内導体間の容量を形成すること
によって、上記の課題を解決するものである。
According to the present invention, a conductor film connected to an inner conductor is arranged inside a dielectric block, and a capacitance between the inner conductors of the resonator is formed by the conductor film. This is to solve the above problem.

【0009】すなわち、二枚の誘電体基板が接着されて
複数の共振器が一体に形成された誘電体フィルタにおい
て、直線的に伸びる複数の平行な凹溝を具えた第一の誘
電体基板の凹溝のある表面上に平板の第二の誘電体基板
が接着されて複数の貫通孔が形成された誘電体ブロック
の、貫通孔内の表面全体に内導体が形成され、第一の誘
電体基板と第二の誘電体基板の接着面に対向するそれぞ
れの表面と、凹溝の伸びる方向に平行な両端面に外導体
が形成され、貫通孔の開口する端面の一方に短絡導体が
形成されて複数の共振器が誘電体ブロック内に一体に構
成され、少なくとも一方の誘電体基板の接着される表面
に、一つの共振器の内導体に接続され、隣接する共振器
の内導体と近接対向して容量を形成する導体膜を具えた
ことに特徴を有するものである。
That is, in a dielectric filter in which a plurality of resonators are integrally formed by bonding two dielectric substrates, a first dielectric substrate having a plurality of linear grooves extending linearly is provided. An inner conductor is formed on the entire surface in the through hole of the dielectric block in which a plurality of through holes are formed by bonding a flat second dielectric substrate on the surface with the concave groove, and the first dielectric Outer conductors are formed on the respective surfaces of the substrate and the second dielectric substrate facing the bonding surface, and on both end surfaces parallel to the direction in which the concave groove extends, and a short-circuit conductor is formed on one of the open end surfaces of the through hole. A plurality of resonators are integrally formed in the dielectric block, and are connected to the inner conductor of one resonator and are closely opposed to the inner conductor of the adjacent resonator on the surface to be bonded of at least one dielectric substrate. Characterized by having a conductor film that forms a capacitor It is intended.

【0010】隣接する共振器からそれぞれ導体膜を引き
出して形成し、これを誘電体基板の接着される表面で対
向させることによっても容量性の結合を強めることがで
きる。また、この導体膜を更に誘電体ブロックの開放端
面に引出し、開放端面において内導体に近接して形成し
た導体膜と接続してもよい。
[0010] Capacitive coupling can also be strengthened by forming conductive films from adjacent resonators, and forming the conductive films facing each other on the surface to which the dielectric substrate is bonded. Further, the conductor film may be further drawn to the open end face of the dielectric block and connected to the conductor film formed close to the inner conductor at the open end face.

【0011】[0011]

【作用】内導体に接続された導体膜を形成するので、大
きな容量を得ることができると同時に、寸法、形状ある
いは位置によって容量を調整することもできる。
Since the conductor film connected to the inner conductor is formed, a large capacitance can be obtained, and at the same time, the capacitance can be adjusted according to the size, shape or position.

【0012】また、誘電体ブロックの開放端面に引き出
したときには、開放端面の導体膜を除去したり、付加し
たりすることによって、容量を調整することが容易とな
る。
Further, when the dielectric block is pulled out to the open end face, the capacitance can be easily adjusted by removing or adding the conductive film on the open end face.

【0013】[0013]

【実施例】以下、図面を参照して、本発明の実施例につ
いて説明する。
Embodiments of the present invention will be described below with reference to the drawings.

【0014】図1は、本発明による誘電体フィルタの組
み立て前の状態を示す斜視図である。二本の平行な凹溝
14を具えた第一の誘電体基板11の凹溝14のある側に、平
板の第二の誘電体基板12をガラス等で接着する。これに
よって、平行な二本の貫通孔を具えた誘電体のブロック
が形成される。本発明においては、誘電体基板の接着面
にあらかじめ導体パターン16を形成しておく。この導体
パターン16は凹溝14の縁の部分から隣接する凹溝の方向
にそれぞれ伸びるように形成し、二つの凹溝14の間の誘
電体基板上で平行な導体パターンとしておくとよい。
FIG. 1 is a perspective view showing a state before assembling a dielectric filter according to the present invention. Two parallel grooves
A flat plate-shaped second dielectric substrate 12 is bonded to the side of the first dielectric substrate 11 having the grooves 14 with the concave groove 14 using glass or the like. As a result, a dielectric block having two parallel through holes is formed. In the present invention, the conductor pattern 16 is formed in advance on the bonding surface of the dielectric substrate. The conductor pattern 16 is preferably formed so as to extend from the edge of the groove 14 in the direction of the adjacent groove, and to be a parallel conductor pattern on the dielectric substrate between the two grooves 14.

【0015】図2は、接着後、導体膜を形成した後の、
本発明による誘電体フィルタを示す斜視図である。図1
の誘電体基板11に対応する誘電体基板21と図1の誘電体
基板12に対応する誘電体基板22が接着されてなる誘電体
ブロックに二つの貫通孔25が形成された構造となってい
る。この貫通孔25内の表面には内導体が形成され、その
貫通孔25の伸びる方向と平行な外周面には外導体27が形
成されている。図には示されないが貫通孔25の開口する
一方の端面には短絡導体が形成され、1/4波長TEM
共振の誘電体フィルタが構成される。
FIG. 2 shows a state after bonding and after forming a conductive film.
FIG. 3 is a perspective view showing a dielectric filter according to the present invention. FIG.
A dielectric substrate formed by bonding a dielectric substrate 21 corresponding to the dielectric substrate 11 of FIG. 1 and a dielectric substrate 22 corresponding to the dielectric substrate 12 of FIG. 1 has two through holes 25 formed therein. . An inner conductor is formed on a surface inside the through hole 25, and an outer conductor 27 is formed on an outer peripheral surface parallel to a direction in which the through hole 25 extends. Although not shown in the drawing, a short-circuit conductor is formed on one end face of the through-hole 25, and the 波長 wavelength TEM
A resonant dielectric filter is formed.

【0016】接合面に形成された導体パターン26は貫通
孔25の表面に形成された内導体と接続される。これによ
って、貫通孔25に形成された導体膜による内導体間に接
続された導体膜26によって共振器間に容量が形成され
る。なお、端子電極28は、貫通孔25の伸びる方向に平行
な端面だけでなく、これに隣接する表面にまで跨がって
形成してある。これは、プリント配線板上で面実装を可
能にするためである。もちろん、端子電極28は外導体と
は絶縁しなければならない。
The conductor pattern 26 formed on the joint surface is connected to the inner conductor formed on the surface of the through hole 25. As a result, a capacitance is formed between the resonators by the conductor film 26 connected between the inner conductors formed by the conductor film formed in the through hole 25. Note that the terminal electrode 28 is formed not only on an end surface parallel to the direction in which the through hole 25 extends, but also on a surface adjacent thereto. This is to enable surface mounting on a printed wiring board. Of course, the terminal electrode 28 must be insulated from the outer conductor.

【0017】図1の例では、導体パターン16は凹溝を有
する誘電体基板11の側に形成されているが、実際に製造
する際には、図3のように、平板の誘電体基板32の表面
に形成する方が容易である。なお、このときに共振器間
の結合を得る導体膜36とともに、入出力結合用の電極と
なる導体パターン39を併せて形成しておくとよい。
In the example of FIG. 1, the conductor pattern 16 is formed on the side of the dielectric substrate 11 having the concave groove. However, when actually manufacturing, as shown in FIG. It is easier to form on the surface. At this time, a conductor pattern 39 serving as an input / output coupling electrode may be formed together with the conductor film 36 for obtaining coupling between the resonators.

【0018】なお、上記の例では、二つの共振器からそ
れぞれ導体パターンを引き出しているが、一方のみから
引き出して他方の共振器の内導体に近接した位置に対向
するように形成するだけでもよい。
In the above example, the conductor patterns are respectively drawn from the two resonators. However, the conductor patterns may be drawn only from one of the two resonators and formed so as to face a position close to the inner conductor of the other resonator. .

【0019】また、図4に示したように、共振器間の結
合を得る導体パターンを開放端面に形成された導体パタ
ーン46に接続してもよい。この構造は、接着前に形成し
ておく導体パターンを凹溝の縁と端面に引き出して形成
しておくことによって実現できる。通常、開放端面は共
振周波数の調整のために研磨するので、解放端面の導体
パターン46は研磨した後に形成される。またこの構造で
は、開放端面にも導体パターンが形成されているので、
内導体間の容量をより大きくすることができる。また、
この導体パターンの寸法、位置によって容量を調整した
り、研削や付加によって調整も可能となる。
As shown in FIG. 4, a conductor pattern for obtaining coupling between resonators may be connected to a conductor pattern 46 formed on the open end face. This structure can be realized by extracting and forming the conductor pattern formed before bonding on the edge and the end face of the concave groove. Usually, the open end face is polished to adjust the resonance frequency, and thus the conductor pattern 46 on the open end face is formed after the polishing. In this structure, the conductor pattern is also formed on the open end face,
The capacity between the inner conductors can be further increased. Also,
The capacitance can be adjusted depending on the size and position of the conductor pattern, or can be adjusted by grinding or adding.

【0020】図5は、本発明による誘電体フィルタの特
性の説明図である。凹溝を設けた厚さ1.6mm の基板と厚
さ0.9mm の平板の基板を接着したもので、凹溝の中心間
隔は2.5mm 、幅1mm 、深さ0.9mm としたもので、開放端
面の寸法が2.7mm ×6.5mm の誘電体フィルタの例であ
る。凹溝の長さは共振周波数によって異なるが、約9.5m
mとしたとき、中心周波数を1575.4MHz で、挿入損失が
約2dBのフィルタが得られ、その通過帯域特性は図5の
通りとなっていた。図に示されたように、通過帯域の低
域側の減衰特性が急峻となっている。
FIG. 5 is an explanatory diagram of characteristics of the dielectric filter according to the present invention. A 1.6 mm thick board with a groove and a 0.9 mm thick flat board are bonded together.The center spacing of the grooves is 2.5 mm, the width is 1 mm, and the depth is 0.9 mm. This is an example of a dielectric filter with dimensions of 2.7 mm x 6.5 mm. The length of the groove depends on the resonance frequency, but is about 9.5m
When m, a filter having a center frequency of 1575.4 MHz and an insertion loss of about 2 dB was obtained, and the pass band characteristics were as shown in FIG. As shown in the figure, the attenuation characteristic on the lower side of the pass band is steep.

【0021】[0021]

【発明の効果】本発明によれば、共振器間の容量性の結
合の強い誘電体フィルタを得ることが容易となり、それ
によって周波数帯域通過特性を調整することができる。
しかも、特別な部品も必要とせず、導体パターンの形成
のみで済むので安価な誘電体フィルタが得られる。
According to the present invention, it is easy to obtain a dielectric filter having strong capacitive coupling between resonators, whereby the frequency band-pass characteristics can be adjusted.
Moreover, no special parts are required, and only the formation of the conductor pattern is sufficient, so that an inexpensive dielectric filter can be obtained.

【0022】しかも、開放端面に導体パターンを引き出
した場合には、容量の調整も容易であり、また、増加、
減少のいずれも可能である。
In addition, when the conductor pattern is drawn out to the open end face, the capacitance can be easily adjusted,
Either reduction is possible.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明の実施例(組立前)を示す斜視図FIG. 1 is a perspective view showing an embodiment (before assembly) of the present invention.

【図2】 本発明の実施例(組立後)を示す斜視図FIG. 2 is a perspective view showing an embodiment (after assembly) of the present invention.

【図3】 本発明の他の実施例を示す斜視図FIG. 3 is a perspective view showing another embodiment of the present invention.

【図4】 本発明の他の実施例を示す斜視図FIG. 4 is a perspective view showing another embodiment of the present invention.

【図5】 本発明による誘電体フィルタの特性の説明図FIG. 5 is an explanatory diagram of characteristics of a dielectric filter according to the present invention.

【符号の説明】[Explanation of symbols]

11、 21 :(第一の)誘電体基板 12、22、32:(第二の)誘電体基板 16、26、36:導体パターン 46 :導体パターン 11, 21: (first) dielectric substrate 12, 22, 32: (second) dielectric substrate 16, 26, 36: conductor pattern 46: conductor pattern

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 二枚の誘電体基板が接着されて複数の共
振器が一体に形成された誘電体フィルタにおいて、直線
的に伸びる複数の平行な凹溝を具えた第一の誘電体基板
の凹溝のある表面上に平板の第二の誘電体基板が接着さ
れて複数の貫通孔が形成された誘電体ブロックの、貫通
孔内の表面全体に内導体が形成され、第一の誘電体基板
と第二の誘電体基板の接着面に対向するそれぞれの表面
と、凹溝の伸びる方向に平行な両端面に外導体が形成さ
れ、貫通孔の開口する端面の一方に短絡導体が形成され
て複数の共振器が誘電体ブロック内に一体に構成され、
少なくとも一方の誘電体基板の接着される表面に、一つ
の共振器の内導体に接続され、隣接する共振器の内導体
と近接対向して容量を形成する導体膜を具えたことを特
徴とする誘電体フィルタ。
1. A dielectric filter in which a plurality of resonators are integrally formed by bonding two dielectric substrates to each other, wherein the first dielectric substrate includes a plurality of parallel concave grooves extending linearly. An inner conductor is formed on the entire surface in the through hole of the dielectric block in which a plurality of through holes are formed by bonding a flat second dielectric substrate on the surface with the concave groove, and the first dielectric An outer conductor is formed on each surface of the substrate and the second dielectric substrate facing the bonding surface, and outer conductors are formed on both end surfaces parallel to the extending direction of the concave groove, and a short-circuit conductor is formed on one of the open end surfaces of the through hole. A plurality of resonators are integrally formed in the dielectric block,
At least one of the dielectric substrates is provided with a conductive film connected to the inner conductor of one resonator and formed in close proximity to the inner conductor of an adjacent resonator to form a capacitor. Dielectric filter.
【請求項2】 二枚の誘電体基板が接着されて複数の共
振器が一体に形成された誘電体フィルタにおいて、直線
的に伸びる複数の平行な凹溝を具えた第一の誘電体基板
の凹溝のある表面上に平板の第二の誘電体基板が接着さ
れて複数の貫通孔が形成された誘電体ブロックの、貫通
孔内の表面全体に内導体が形成され、第一の誘電体基板
と第二の誘電体基板の接着面に対向するそれぞれの表面
と、凹溝の伸びる方向に平行な両端面に外導体が形成さ
れ、貫通孔の開口する端面の一方に短絡導体が形成され
て複数の共振器が誘電体ブロック内に一体に構成され、
少なくとも一方の誘電体基板の接着される表面に、隣接
する二つの共振器の内導体にそれぞれ接続され、当該共
振器間の誘電体基板表面で近接対向して容量を形成する
導体膜を具えたことを特徴とする誘電体フィルタ。
2. A dielectric filter in which a plurality of resonators are integrally formed by bonding two dielectric substrates to each other, wherein the first dielectric substrate includes a plurality of parallel concave grooves extending linearly. An inner conductor is formed on the entire surface in the through hole of the dielectric block in which a plurality of through holes are formed by bonding a flat second dielectric substrate on the surface with the concave groove, and the first dielectric Outer conductors are formed on the respective surfaces of the substrate and the second dielectric substrate facing the bonding surface, and on both end surfaces parallel to the direction in which the concave groove extends, and a short-circuit conductor is formed on one of the open end surfaces of the through hole. A plurality of resonators are integrally formed in the dielectric block,
At least one of the dielectric substrates is provided with a conductive film connected to the inner conductors of two adjacent resonators on the surface to be bonded and forming a capacitance in close proximity to the surface of the dielectric substrate between the resonators. A dielectric filter characterized by the above-mentioned.
【請求項3】 接着される表面に形成された二つの導体
膜がそれぞれ開放端面に形成された二つの導体膜に接続
された請求項2記載の誘電体フィルタ。
3. The dielectric filter according to claim 2, wherein the two conductive films formed on the surface to be bonded are connected to the two conductive films formed on the open end surfaces, respectively.
JP4186100A 1992-06-19 1992-06-19 Dielectric filter Expired - Fee Related JP2661005B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4186100A JP2661005B2 (en) 1992-06-19 1992-06-19 Dielectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4186100A JP2661005B2 (en) 1992-06-19 1992-06-19 Dielectric filter

Publications (2)

Publication Number Publication Date
JPH066107A JPH066107A (en) 1994-01-14
JP2661005B2 true JP2661005B2 (en) 1997-10-08

Family

ID=16182368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4186100A Expired - Fee Related JP2661005B2 (en) 1992-06-19 1992-06-19 Dielectric filter

Country Status (1)

Country Link
JP (1) JP2661005B2 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60136503U (en) * 1984-02-22 1985-09-10 ティーディーケイ株式会社 dielectric resonator
JPS61156903A (en) * 1984-12-27 1986-07-16 Sony Corp Dielectric filter
JPH0432803Y2 (en) * 1986-05-08 1992-08-06
JPH0758873B2 (en) * 1988-08-01 1995-06-21 富士通株式会社 Waveguide hybrid and high-frequency power amplifier using the same
JPH04312002A (en) * 1991-04-11 1992-11-04 Murata Mfg Co Ltd Dielectric filter

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