JP3306137B2 - Method of adjusting resonance frequency of dielectric filter - Google Patents
Method of adjusting resonance frequency of dielectric filterInfo
- Publication number
- JP3306137B2 JP3306137B2 JP33376092A JP33376092A JP3306137B2 JP 3306137 B2 JP3306137 B2 JP 3306137B2 JP 33376092 A JP33376092 A JP 33376092A JP 33376092 A JP33376092 A JP 33376092A JP 3306137 B2 JP3306137 B2 JP 3306137B2
- Authority
- JP
- Japan
- Prior art keywords
- dielectric substrate
- conductor
- resonance frequency
- dielectric
- concave groove
- 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
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、誘電体フィルタの共振
周波数の調整方法に係るもので、特に、その端子電極と
外導体との距離によって調整する方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the resonance frequency of a dielectric filter, and more particularly to a method for adjusting the resonance frequency by adjusting the distance between a terminal electrode and an outer conductor.
【0002】[0002]
【従来の技術】UHF帯からマイクロ波帯といった高周
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。別個
の共振器を接続して構成するものと、複数の共振器がブ
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 such as a UHF band to a 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 type in which separate resonators are connected and a type in which a plurality of resonators are integrated into a block.
【0003】それらの誘電体フィルタにおいては、入出
力の結合容量を入出力段の共振器の内導体との間で形成
しなければならない。この結合容量は、コンデンサを接
続したり、コンデンサを形成した誘電体基板を用いる方
法から、誘電体を被覆した金属棒を内導体の形成された
貫通孔に挿入したり、内導体の近傍の誘電体に設けた孔
に金属棒を差し込んだり、外導体と分離して外周面に金
属皮膜を形成したりする、各種の方法が考えられてい
る。In these dielectric filters, input and output coupling capacitances must be formed between the input and output stages and the inner conductor of the resonator. The coupling capacity can be changed by connecting a capacitor or inserting a metal rod coated with a dielectric into a through-hole formed with an inner conductor, or by using a dielectric substrate near the inner conductor. Various methods for inserting a metal rod into a hole provided in a body or forming a metal film on an outer peripheral surface separately from an outer conductor have been considered.
【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。そこで、
本発明者は先に特願平4−179112号において、二
枚の誘電体基板を貼り合わせて誘電体フィルタを形成
し、その貼り合わせ面に入出力電極を形成する構造を提
案した。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. Therefore,
The present inventor has previously proposed in Japanese Patent Application No. 4-179112 a structure in which a dielectric filter is formed by bonding two dielectric substrates and an input / output electrode is formed on the bonded surface.
【0005】[0005]
【発明が解決しようとする課題】誘電体フィルタにおい
て必要帯域幅を広くする必要がある場合には、入出力結
合容量の値を大きくしなければならない。しかし、フィ
ルタを小型化すると結合容量を形成する電極の寸法も制
約され、大きな容量を得ることが困難になる。また、Q
の低下の問題も生じる。If it is necessary to increase the required bandwidth of the dielectric filter, the value of the input / output coupling capacitance must be increased. However, when the size of the filter is reduced, the size of the electrode forming the coupling capacitance is also restricted, and it is difficult to obtain a large capacitance. Also, Q
There is also a problem of a decrease in the temperature.
【0006】また、大きな入出力結合容量を得るため
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。また、共振周波数の微調整を行える構造が
望ましい。Further, it is desirable to avoid adding or connecting special components in order to obtain a large input / output coupling capacitance. Further, a structure that can finely adjust the resonance frequency is desirable.
【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、入出力端の誘電体共振器と外部
回路との接続を行う誘電体フィルタに適した共振周波数
の調整方法を提供するものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and adjusts the resonance frequency suitable for a dielectric filter for connecting a dielectric resonator at an input / output end to an external circuit with a simple structure and a simple manufacturing process. It provides a method.
【0008】[0008]
【課題を解決するための手段】本発明は、誘電体ブロッ
クの入出力端の共振器の内導体とインピーダンス整合点
で接続された導体膜を端子電極を接続し、この端子電極
と外導体との距離を調節することによって、上記の課題
を解決するものである。According to the present invention, a terminal electrode is connected to a conductor film connected at an impedance matching point to an inner conductor of a resonator at an input / output end of a dielectric block, and the terminal electrode is connected to an outer conductor. The above-mentioned problem is solved by adjusting the distance.
【0009】すなわち、直線的に伸びる平行な複数の凹
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、凹溝内と第二の誘電体
基盤の凹溝に対向する表面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されない表面と凹
溝の伸びる方向に平行な端面に外導体が形成され、凹溝
の露出する端面の一方に短絡導体が形成されて複数の共
振器が構成された誘電体フィルタの共振周波数調整方法
において、凹溝の伸びる方向に平行な端面から入出力共
振器となる凹溝方向に伸びてインピーダンス整合点で内
導体と接続される導体膜が少なくとも一方の誘電体基板
の接着面に形成され、これらの導体膜が凹溝の伸びる方
向に平行な端面に外導体とは絶縁されて形成された端子
用導体膜に接続され、それらの端子用導体膜と外導体と
の距離を変えることによって共振周波数を調整すること
に特徴を有するものである。That is, a flat plate-shaped second dielectric substrate is adhered on the grooved surface of the first dielectric substrate having a plurality of linear grooves extending linearly, and the inside of the groove and the second dielectric substrate are adhered to each other. An inner conductor is formed on a surface of the dielectric substrate facing the concave groove, and an outer conductor is formed on an unbonded surface of the first dielectric substrate and the second dielectric substrate and an end surface parallel to the extending direction of the concave groove. In the method of adjusting the resonance frequency of a dielectric filter in which a plurality of resonators are formed by forming a short-circuit conductor on one of the exposed end faces of the groove, input / output is performed from an end face parallel to the extending direction of the groove.
Extends in the direction of the groove that becomes the vibration
Conductive film connected to a conductor has at least one dielectric substrate
The conductor film is formed on the adhesive surface of
Terminal formed on the end face parallel to the direction insulated from the outer conductor
The characteristic feature is that the resonance frequency is adjusted by changing the distance between the terminal conductor film and the outer conductor and connected to the terminal conductor film.
【0010】[0010]
【作用】端子電極との距離を広げることによって共振周
波数が低下する。組み立て、実装後においても共振周波
数の微調整が可能となる。The resonance frequency is reduced by increasing the distance from the terminal electrode. Fine adjustment of the resonance frequency is possible even after assembly and mounting.
【0011】[0011]
【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.
【0012】図1は、本発明を適用する誘電体フィルタ
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12
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の伸びる方向に平行な端面
から凹溝に対向する部分まで伸びるように形成し、接着
後に誘電体基板11の凹溝14とそれに対向する誘電体基板
12の表面に形成される内導体と接続されるように形成し
ておく。FIG. 1 is a perspective view showing a state before assembling a dielectric filter to which the present invention is applied. A flat plate-shaped second dielectric substrate 12 is bonded to the side of the first dielectric substrate 11 having the two parallel concave grooves 14 with the concave grooves 14 using glass or the like.
As a result, a dielectric block having two parallel through holes is formed. In the present invention, the dielectric substrate 12
The conductor pattern 16 is previously formed on the bonding surface of.
The conductor pattern 16 is formed so as to extend from an end face parallel to the extending direction of the groove 14 to a portion facing the groove, and after bonding, the groove 14 of the dielectric substrate 11 and the dielectric substrate facing the groove.
It is formed so as to be connected to the inner conductor formed on the surface of 12.
【0013】図2は、接着後、導体膜を形成した後の、
図1と同じ誘電体フィルタを示す斜視図である。誘電体
基板21と誘電体基板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2では、インターデジタル型で2素子の例を示
してあり、左側の共振子では手前が開放端面になってお
り、右側の共振子では手前が短絡端面となり、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. 2 is a perspective view showing the same dielectric filter as FIG. 1. It has a structure in which two through holes 25 are formed in a dielectric block in which a dielectric substrate 21 and a dielectric substrate 22 are bonded. An inner conductor is formed on the surface inside the through hole 25,
The outer conductor 27 is formed on the outer peripheral surface parallel to the direction in which the outer conductor 27 extends. FIG. 2 shows an example of two elements of the interdigital type. The left resonator has an open end face on the front side, the right resonator has a short-circuit end face on the front side, and a dielectric of quarter-wave TEM resonance. A body filter is configured.
【0014】図1で示した接合面に形成された導体パタ
ーン(16) は誘電体基板の端面で端子電極28と接続さ
れ、貫通孔25に形成された導体膜による内導体と端子電
極28とを直接接続する。導体パターン(16)と内導体と
の接続は、入出力端の共振器の内導体の50オーム点等の
インピーダンス整合点とする。これによって、入出力端
子は入出力端の共振器の内導体と直接、インピーダンス
の整合がとられた状態で接続されることになる。The conductor pattern (16) formed on the joint surface shown in FIG. 1 is connected to the terminal electrode 28 at the end face of the dielectric substrate, and the inner conductor formed by the conductor film formed in the through hole 25 and the terminal electrode 28 are connected to each other. Connect directly. The connection between the conductor pattern (16) and the inner conductor is made at an impedance matching point such as the 50 ohm point of the inner conductor of the resonator at the input / output end. As a result, the input / output terminal is directly connected to the inner conductor of the resonator at the input / output end in a state where the impedance is matched.
【0015】端子電極28は、二枚の誘電体基板に跨がっ
て形成される導体膜であり、外導体27とは絶縁されてい
るが近接して形成されている。したがって、入出力端と
アースとの間に容量が形成されることになる。端子電極
28、外導体27のいずれかの対向する部分をトリミングす
ると磁界分布が変化し、共振周波数が変わる。間隔を広
げると共振周波数が下がる方向に変化する。このトリミ
ングによって、中心周波数に対する周波数変化(Δf/
f0 )を1%程度変化させることができる。The terminal electrode 28 is a conductor film formed straddling two dielectric substrates, and is insulated from the outer conductor 27 but formed close to it. Therefore, a capacitance is formed between the input / output terminal and the ground. Terminal electrode
28, when any opposing portion of the outer conductor 27 is trimmed, the magnetic field distribution changes and the resonance frequency changes. Increasing the interval changes the direction in which the resonance frequency decreases. By this trimming, a frequency change (Δf /
f 0 ) can be changed by about 1%.
【0016】上記の例では、二素子の誘電体フィルタで
インターデジタル型のものを示したが、三素子以上のブ
ロックでも用いることができるし、開放端面と短絡端面
が揃ったコムライン型の誘電体フィルタでも同様に適用
できる。In the above example, an interdigital type two-element dielectric filter has been described. However, a block having three or more elements can be used, and a comb-line type dielectric filter having an open end face and a short-circuit end face can be used. The same applies to body filters.
【0017】[0017]
【発明の効果】本発明によれば、入出力結合容量が不要
となって小型の誘電体フィルタが得られるだけでなく、
共振周波数の調整も容易となる。According to the present invention, not only a small-sized dielectric filter can be obtained by eliminating the need for an input / output coupling capacitance, but also
Adjustment of the resonance frequency is also facilitated.
【0018】その結果、広い通過帯域が必要な誘電体フ
ィルタが、小型でしかも安価に得られる。As a result, a dielectric filter requiring a wide pass band can be obtained at a small size and at low cost.
【図1】 本発明を適用する誘電体フィルタ(組立前)
を示す斜視図FIG. 1 shows a dielectric filter to which the present invention is applied (before assembly).
Perspective view showing
【図2】 本発明の適用する誘電体フィルタ(組立後)
を示す斜視図FIG. 2 shows a dielectric filter to which the present invention is applied (after assembly).
Perspective view showing
11、21:(第一の)誘電体基板 12、22:(第二の)誘電体基板 16 : 導体パターン 27: 外導体 28 : 端子電極 11, 21: (first) dielectric substrate 12, 22: (second) dielectric substrate 16: conductor pattern 27: outer conductor 28: terminal electrode
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) H01P 1/20 - 1/219 H01P 7/00 - 7/10 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H01P 1/20-1/219 H01P 7/ 00-7/10
Claims (2)
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、凹溝内と第二の誘電体基盤の凹
溝に対向する表面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されない表面と凹溝の伸び
る方向に平行な端面に外導体が形成され、凹溝の露出す
る端面の一方に短絡導体が形成されて複数の共振器が構
成された誘電体フィルタの共振周波数調整方法におい
て、凹溝の伸びる方向に平行な端面から入出力共振器と
なる凹溝方向に伸びてインピーダンス整合点で内導体と
接続される導体膜が少なくとも一方の誘電体基板の接着
面に形成され、これらの導体膜が凹溝の伸びる方向に平
行な端面に外導体とは絶縁されて形成された端子用導体
膜に接続され、それらの端子用導体膜と外導体との距離
を変えることによって共振周波数を調整することを特徴
とする誘電体フィルタの共振周波数調整方法。A first dielectric substrate having a plurality of linear grooves extending in parallel and a flat plate-shaped second dielectric substrate adhered to the grooved surface of the first dielectric substrate; An inner conductor is formed on a surface of the dielectric substrate facing the concave groove, and an outer conductor is formed on an unbonded surface of the first dielectric substrate and the second dielectric substrate and an end surface parallel to the extending direction of the concave groove. In the method of adjusting the resonance frequency of the dielectric filter in which a plurality of resonators are formed by forming a short-circuit conductor on one of the exposed end faces of the concave groove, the input / output resonator and the input / output resonator are formed from the end face parallel to the extending direction of the concave groove.
To the inner conductor at the impedance matching point
Adhesion of at least one dielectric substrate to the conductive film to be connected
These conductor films are formed in a plane in the direction in which the groove extends.
Terminal conductor formed on the end face of the line, insulated from the outer conductor
A resonance frequency adjustment method for a dielectric filter, wherein the resonance frequency is adjusted by changing the distance between the terminal conductor film and the outer conductor connected to the film .
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、凹溝内と第二の誘電体基盤の凹
溝に対向する表面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されない表面と凹溝の伸び
る方向に平行な端面に外導体が形成され、凹溝の露出す
る端面の一方に短絡導体が形成されて複数の共振器が構
成された誘電体フィルタの共振周波数調整方法におい
て、凹溝の伸びる方向に平行な端面から入出力共振器と
なる凹溝方向に伸びてインピーダンス整合点で内導体と
接続される導体膜が少なくとも一方の誘電体基板の接着
面に形成され、これらの導体膜が凹溝の伸びる方向に平
行な端面に外導体とは絶縁されて形成された端子用導体
膜に接続され、それらの端子用導体膜と外導体との距離
を広げることによって共振周波数を下げることを特徴と
する誘電体フィルタの共振周波数調整方法。2. A flat plate-like second dielectric substrate is adhered on a grooved surface of a first dielectric substrate having a plurality of linear grooves extending in a straight line. An inner conductor is formed on a surface of the dielectric substrate facing the concave groove, and an outer conductor is formed on an unbonded surface of the first dielectric substrate and the second dielectric substrate and an end surface parallel to the extending direction of the concave groove. In the method of adjusting the resonance frequency of the dielectric filter in which a plurality of resonators are formed by forming a short-circuit conductor on one of the exposed end faces of the concave groove, the input / output resonator and the input / output resonator are formed from the end face parallel to the extending direction of the concave groove.
To the inner conductor at the impedance matching point
Adhesion of at least one dielectric substrate to the conductive film to be connected
These conductor films are formed in a plane in the direction in which the groove extends.
Terminal conductor formed on the end face of the line, insulated from the outer conductor
A resonance frequency adjusting method for a dielectric filter, characterized in that the resonance frequency is reduced by increasing the distance between the terminal conductor film and the outer conductor connected to the film .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33376092A JP3306137B2 (en) | 1992-11-20 | 1992-11-20 | Method of adjusting resonance frequency of dielectric filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33376092A JP3306137B2 (en) | 1992-11-20 | 1992-11-20 | Method of adjusting resonance frequency of dielectric filter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06204707A JPH06204707A (en) | 1994-07-22 |
JP3306137B2 true JP3306137B2 (en) | 2002-07-24 |
Family
ID=18269656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP33376092A Expired - Fee Related JP3306137B2 (en) | 1992-11-20 | 1992-11-20 | Method of adjusting resonance frequency of dielectric filter |
Country Status (1)
Country | Link |
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JP (1) | JP3306137B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100330685B1 (en) * | 1999-11-23 | 2002-04-03 | 박호군 | Monoblock dielectric filter with an attenuation pole |
-
1992
- 1992-11-20 JP JP33376092A patent/JP3306137B2/en not_active Expired - Fee Related
Also Published As
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JPH06204707A (en) | 1994-07-22 |
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