JPH06140807A - Dielectric filter - Google Patents
Dielectric filterInfo
- Publication number
- JPH06140807A JPH06140807A JP28847592A JP28847592A JPH06140807A JP H06140807 A JPH06140807 A JP H06140807A JP 28847592 A JP28847592 A JP 28847592A JP 28847592 A JP28847592 A JP 28847592A JP H06140807 A JPH06140807 A JP H06140807A
- Authority
- JP
- Japan
- Prior art keywords
- dielectric substrate
- electrode layer
- dielectric
- conductor
- filter
- 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.)
- Pending
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Landscapes
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばバンドパスフィ
ルタとして使用され得る誘電体フィルタに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter which can be used as a bandpass filter, for example.
【０００２】[0002]
【従来技術】一般に知られているように、バンドパスフ
ィルタとして用いられる誘電体フィルタにおいては、通
過帯域幅は結合係数によって決まる。そこでこの結合係
数を調整するため共振器間の距離を変えたり、結合調整
用孔を設けたりしている。しかし、結合係数を大きくす
る場合には共振器間の距離を小さくするか結合調整用孔
を大きくする必要があり、そのため共振器間の間隔及び
共振器と調整用孔との間隔が狭くなり、その結果、フィ
ルタの製造上加工し難くなり、そしてこの種の誘電体フ
ィルタに要求されている小形化と相俟って極めて高精度
の加工が要求されていた。このような欠点を解決するた
めフイルタの誘電体基板の外面上に結合コンデンサを設
けて結合容量を調整するようにした種々の形式の誘電体
フィルタが提案されてきた。例えば特開昭59−114902号
公報には、誘電体ブロックの一面から反対の面に貫通さ
せて設けた複数の穴にそれぞれ共振器を構成する導体を
挿置し、各導体の一端を誘電体ブロックの外表面に設け
た導体膜に接続して短絡端とし、また各導体の他端を開
放端とし、この開放端の位置した誘電体ブロックの表面
上にコンデンサを設けて各導体の開放端を容量結合し、
コンデンサの容量を選定することにより共振器間の結合
容量を任意に設定できるようにした誘電体フィルタが開
示されている。また、特公平３−40962 号公報には、立
方形の誘電体ブロックに一端面から他端面までのびる複
数の貫通孔を設け、これらの各貫通孔に共振器を構成す
る内導体を設け、これら内導体の一端の臨んでいる誘電
体ブロックの一端面には外導体膜を形成して短絡端面と
して内導体の一端を短絡させ、また内導体の他端の臨ん
でいる誘電体ブロックの他端面は開放端面とし、そこに
コンデンサ電極を設けて容量結合した誘電体フィルタが
開示されている。2. Description of the Related Art As is generally known, in a dielectric filter used as a bandpass filter, the pass band width is determined by the coupling coefficient. Therefore, in order to adjust this coupling coefficient, the distance between the resonators is changed or a coupling adjusting hole is provided. However, in order to increase the coupling coefficient, it is necessary to reduce the distance between the resonators or increase the size of the coupling adjusting hole, which reduces the distance between the resonators and the distance between the resonator and the adjusting hole. As a result, it becomes difficult to process the filter in manufacturing, and in combination with the miniaturization required for this type of dielectric filter, extremely high-precision processing is required. In order to solve these drawbacks, various types of dielectric filters have been proposed in which a coupling capacitor is provided on the outer surface of the dielectric substrate of the filter to adjust the coupling capacitance. For example, in Japanese Patent Laid-Open No. 59-114902, conductors constituting a resonator are respectively inserted into a plurality of holes penetrating from one surface to the opposite surface of a dielectric block, and one end of each conductor is made into a dielectric material. Connect to the conductor film provided on the outer surface of the block to make a short-circuited end, and make the other end of each conductor an open end, and place a capacitor on the surface of the dielectric block where this open end is located to open the end of each conductor. Capacitively couple
A dielectric filter is disclosed in which the coupling capacitance between resonators can be arbitrarily set by selecting the capacitance of a capacitor. In Japanese Patent Publication No. 3-40962, a cubic dielectric block is provided with a plurality of through holes extending from one end surface to the other end surface, and inner conductors forming a resonator are provided in each of these through holes. An outer conductor film is formed on one end face of the dielectric block facing one end of the inner conductor to short-circuit one end of the inner conductor as a short-circuit end face, and the other end face of the dielectric block facing the other end of the inner conductor. Discloses a dielectric filter in which an open end face is provided, and a capacitor electrode is provided on the end face to capacitively couple.
【０００３】[0003]
【発明が解決しようとする課題】上述のような従来の誘
電体フィルタにおいては、フィルタ特性の減衰域に極を
持たせるいわゆる有極化は困難である。ところで、誘電
体フィルタの減衰域に極を持たせる例としては隣接する
誘電体共振器の開放端を外表面に設けたリアクタンス素
子を用いて接続し、リアクタンス素子間に並列共振回路
を形成して特定の周波数で***振状態となるようにし、
減衰極を形成したもの（例えば特開昭63−60603 号公報
参照）や、誘電体ブロックの表面及びその内部に設けた
貫通孔の内周囲面に沿ってそれぞれ外導体及び内導体を
設け、内導体の相互間の所定の位置に、外導体に接続さ
れた導体膜で覆われた溝を設けて、内導体間を異なる極
性で結合し、減衰極を形成するようにしたもの（特開昭
63−90202 号公報参照）が提案されているが、前者のも
のはリアクタンス素子を外面すなわち開放端面上に形成
しているため、外部電磁界の影響を受け易く、また後者
のものは構造が複雑となりしかも微細加工が要求され、
この種の誘電体フィルタに要求されている小型化や薄型
化を満たすことができない。また、前述のような従来の
誘電体フィルタでは入出力部と共振器間の結合容量は誘
電体ブロックの外表面に設けられるコンデンサの容量で
決まり、かかるコンデンサは共振導体の開放端面または
この開放端面に導通接続された電極とそれに隣接して設
けられる電極とで構成されており、しかも通常誘電体ブ
ロックの外部導体の設けられてない表面上に設けられる
ため、電極の大きさは自ずと制限される。というのは、
使用する誘電体ブロックを大きくすれば電極の大きさを
大きくできるが、この種の誘電体フィルタに要求されて
いる小型化の観点から誘電体ブロックの大きさも制限さ
れるためである。その結果、結合容量は小さく、外部の
電磁界の影響を受け易く、しかも電極を設ける際所望の
結合容量を得るためには高精度の加工処理が要求される
ことになる。すなわち従来の誘電体フィルタでは小型化
及び薄型化の要求を満たしつつ減衰帯域の有極化は難し
く、また使用時に外部電磁界の影響を受け易く、また装
置の製造上高精度の加工が必要であり、素子の製造コス
トが高くつくという問題点がある。In the conventional dielectric filter as described above, it is difficult to make a so-called polarization having a pole in the attenuation region of the filter characteristic. By the way, as an example of providing a pole in the attenuation region of a dielectric filter, an open end of an adjacent dielectric resonator is connected using a reactance element provided on the outer surface, and a parallel resonance circuit is formed between the reactance elements. To be in anti-resonance state at a specific frequency,
An outer conductor and an inner conductor are provided along the surface of the dielectric block and the inner peripheral surface of the through hole provided in the inner surface of the dielectric block (see, for example, JP-A-63-60603). A groove covered with a conductor film connected to an outer conductor is provided at a predetermined position between the conductors so that the inner conductors are coupled with different polarities to form an attenuation pole.
No. 63-90202) is proposed, but the former one is more susceptible to external electromagnetic fields because the reactance element is formed on the outer surface, that is, the open end face, and the latter one has a complicated structure. Moreover, fine processing is required,
The miniaturization and thinning required for this type of dielectric filter cannot be satisfied. Further, in the conventional dielectric filter as described above, the coupling capacitance between the input / output section and the resonator is determined by the capacitance of the capacitor provided on the outer surface of the dielectric block. The size of the electrode is naturally limited because it is formed on the surface of the dielectric block on which the outer conductor is not provided and which is composed of the electrode electrically connected to the electrode and the electrode provided adjacent to the electrode. . I mean,
The size of the electrode can be increased by increasing the size of the dielectric block used, but the size of the dielectric block is also limited from the viewpoint of miniaturization required for this type of dielectric filter. As a result, the coupling capacitance is small and is easily affected by an external electromagnetic field, and moreover, highly precise processing is required to obtain a desired coupling capacitance when the electrodes are provided. That is, with the conventional dielectric filter, it is difficult to polarize the attenuation band while satisfying the requirements for downsizing and thinning, and it is easy to be affected by the external electromagnetic field during use, and highly precise processing is required in manufacturing the device. However, there is a problem that the manufacturing cost of the device is high.
【０００４】そこで、本発明は、従来の誘電体フィルタ
に伴う問題点を解決して、小型化及び薄型化の要求を満
たしながらフィルタ特性の減衰域に有極化が可能でしか
も入出力部と共振器間の結合容量を比較的大きな自由度
をもつて調整でき、製造上高精度な加工処理のいらない
誘電体フィルタを提供することを目的としている。Therefore, the present invention solves the problems associated with the conventional dielectric filters, and can polarize the attenuation range of the filter characteristics while satisfying the demands for downsizing and thinning. It is an object of the present invention to provide a dielectric filter that can adjust the coupling capacitance between resonators with a relatively large degree of freedom and that does not require a highly accurate manufacturing process in manufacturing.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明による誘電体フィルタは、誘電体基板の上
面と下面との間のほぼ中間位置に、前端面から後端面ま
でのびる複数の共振導体を並行して挿置し、各共振導体
の一端を誘電体基板の外周面に設けた外部導体に接続し
て短絡端とし、また他端を上記外部導体に接続せずに開
放端とし、これらの共振導体を通る平面に平行でしかも
これらの共振導体を切らない面で誘電体基板を二つの誘
電体基板部分に分けて構成し、積層される誘電体基板部
分の少なくとも一方の内面上に共振導体間を跨いで段間
結合用電極層を設けたことを特徴としている。また本発
明の別の特徴によれば、さらに各共振導体の開放端に相
対する上記内面上の位置に入力結合用電極層及び出力結
合用電極層が設けられる。In order to achieve the above object, a dielectric filter according to the present invention comprises a plurality of dielectric filters extending from a front end face to a rear end face at a substantially intermediate position between an upper surface and a lower surface of a dielectric substrate. The resonance conductors are inserted in parallel, one end of each resonance conductor is connected to an external conductor provided on the outer peripheral surface of the dielectric substrate to form a short-circuit end, and the other end is an open end without being connected to the external conductor. And the dielectric substrate is divided into two dielectric substrate parts on a plane parallel to the plane passing through these resonant conductors and not cutting these resonant conductors, and the inner surface of at least one of the laminated dielectric substrate parts It is characterized in that an inter-stage coupling electrode layer is provided on the resonance conductor so as to extend over the resonance conductors. According to another feature of the present invention, an input coupling electrode layer and an output coupling electrode layer are further provided at positions on the inner surface facing the open ends of the resonance conductors.
【０００６】[0006]
【作用】本発明による誘電体フィルタにおいては、共振
導体間を跨いで段間結合用電極層を設けたことにより、
図５に示すように、フィルタ特性の減衰域に極が形成さ
れ、形成される極の位置は、段間結合用電極層の大き
さ、位置及び共振導体間の磁界結合により決定すること
ができる。また、誘電体基板を二つの部分すなわち内部
に共振導体の設けられた一方の誘電体基板部分とこの一
方の誘電体基板部分に積層される他方の誘電体基板部分
とに別けて構成し、互いに積層されるこれら誘電体基板
部分の少なくとも一方の内面上に段間結合用電極層を設
けているので、段間結合が誘電体基板内で行われること
になり、使用時における外部電磁界の影響を低減させる
ことができるようになる。また、本発明の別の特徴によ
れば、段間結合用電極層に加えて入出力結合用電極層も
誘電体基板部分の積層される内面上に形成しているの
で、これらの結合用電極層の面積は比較的広範囲に選定
することができ、そして誘電体基板をどのレベルで二つ
の部分に別けて構成するかにより一方の誘電体基板部分
内に設けた共振導体と入出力結合用電極層との間の間隔
を任意に調整することができ、それにより結合容量は大
幅に調整できるようになる。In the dielectric filter according to the present invention, by providing the inter-stage coupling electrode layer across the resonance conductors,
As shown in FIG. 5, a pole is formed in the attenuation region of the filter characteristic, and the position of the formed pole can be determined by the size and position of the inter-stage coupling electrode layer and magnetic field coupling between the resonant conductors. . In addition, the dielectric substrate is divided into two parts, that is, one dielectric substrate part in which the resonance conductor is provided and the other dielectric substrate part laminated on the one dielectric substrate part, Since the inter-step coupling electrode layer is provided on the inner surface of at least one of these laminated dielectric substrate portions, inter-step coupling is performed within the dielectric substrate, and the influence of external electromagnetic fields during use Can be reduced. Further, according to another feature of the present invention, in addition to the inter-stage coupling electrode layer, the input / output coupling electrode layer is also formed on the inner surface of the dielectric substrate portion to be laminated, so that these coupling electrodes are formed. The area of the layers can be selected in a relatively wide range, and the resonance conductor and the input / output coupling electrode provided in one of the dielectric substrate parts are determined depending on which level the dielectric substrate is divided into two parts. The spacing between the layers can be adjusted arbitrarily, which allows the coupling capacitance to be adjusted significantly.
【０００７】[0007]
【実施例】以下添付図面を参照して本発明の実施例につ
いて説明する。図１〜図３には本発明の一実施例を示
し、図示誘電体フィルタは、誘電体セラミック材料から
成る誘電体基板１を有し、この誘電体基板１は厚い誘電
体基板部分1aと薄い誘電体基板部分1bとに分けて構成さ
れ、組立時に互いに積層接着される。一方すなわち厚い
方の誘電体基板部分1a内には二本の共振導体２、３がそ
の前面部から後面部まで並行にのびるように挿置されて
いる。また両誘電体基板部分1a、1bの外周面にはその前
面部を除いて外部導体層４が設けられている。これらの
外部導体層４は図２及び図３に示すように各誘電体基板
部分1a、1bの内面縁部までのびており、両部分が互いに
積層された時、両部分における外部導体層４の確実な接
続すなわち接触を保証するようにしている。従って各共
振導体２、３の一端は基板１の後端上の外部導体層４に
よって短絡され、短絡端を形成し、そして各共振導体
２、３の他端は基板１の外部導体層４の設けられてない
前面部までのび、開放端を形成している。また、誘電体
基板部分1a、1bの互いに積層される内面には、図２、図
３に示すように各共振導体２、３の開放端に対応した位
置に入力結合用電極層５及び出力結合用電極層６が、そ
して共振導体２、３を跨いで段間結合用電極層７がそれ
ぞれ形成されている。入出力結合用電極層５、６はそれ
ぞれ図３に示すように他方の誘電体基板部分1bの前端部
から外面へかけて形成された入出力端子８、９に接続さ
れ、これらの入出力端子８、９は他方の誘電体基板部分
1bの外面部に形成された外部導体層４との間に図示した
ようにスペース10を設けて絶縁されている。一方、共振
導体２、３を跨いで両誘電体基板部分1a、1bの対応した
位置に形成された段間結合用電極層７は図５に示すよう
にフィルタ特性における減衰域に極を形成する働きをし
ている。こうして共振導体、入出力結合用電極層、段間
結合用電極層７及び外部導体層の形成された二つの誘電
体基板部分1a、1bは互いに積層接着され、それによりコ
ムライン型の誘電体フィルタが得られる。この誘電体フ
ィルタの等価回路を図４に示す。図４においてC1は入力
結合用電極層５で構成された入力コンデンサを表し、C2
は出力結合用電極層５で構成された出力コンデンサを表
し、C3は段間結合用電極層７で構成された段間結合コン
デンサを表している。Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an embodiment of the present invention, the illustrated dielectric filter has a dielectric substrate 1 made of a dielectric ceramic material, and the dielectric substrate 1 has a thick dielectric substrate portion 1a and a thin dielectric substrate portion 1a. It is constructed separately from the dielectric substrate portion 1b and is laminated and adhered to each other at the time of assembly. On the other hand, that is, in the thicker dielectric substrate portion 1a, two resonance conductors 2 and 3 are arranged so as to extend in parallel from the front surface portion to the rear surface portion. An outer conductor layer 4 is provided on the outer peripheral surfaces of both dielectric substrate portions 1a and 1b except for the front surface portions thereof. As shown in FIGS. 2 and 3, these outer conductor layers 4 extend to the inner edge portions of the respective dielectric substrate portions 1a and 1b, and when both portions are laminated with each other, the outer conductor layer 4 in both portions is surely secured. To ensure a good connection or contact. Therefore, one end of each resonant conductor 2, 3 is short-circuited by the outer conductor layer 4 on the rear end of the substrate 1 to form a short-circuited end, and the other end of each resonant conductor 2, 3 is of the outer conductor layer 4 of the substrate 1. It extends to the front surface not provided and forms an open end. In addition, on the inner surfaces of the dielectric substrate portions 1a and 1b that are stacked on each other, as shown in FIGS. 2 and 3, at the positions corresponding to the open ends of the resonance conductors 2 and 3, the input coupling electrode layer 5 and the output coupling electrode layer 5 are formed. The electrode layer 6 is formed, and the inter-stage coupling electrode layer 7 is formed across the resonance conductors 2 and 3. The input / output coupling electrode layers 5 and 6 are respectively connected to input / output terminals 8 and 9 formed from the front end portion of the other dielectric substrate portion 1b to the outer surface as shown in FIG. 8 and 9 are the other dielectric substrate parts
As shown in the drawing, a space 10 is provided between the outer conductor 1b and the outer conductor layer 4 formed on the outer surface of the outer conductor 1b for insulation. On the other hand, the inter-stage coupling electrode layer 7 formed at the corresponding positions of both dielectric substrate portions 1a and 1b straddling the resonance conductors 2 and 3 forms a pole in the attenuation region in the filter characteristic as shown in FIG. Is working. In this way, the two dielectric substrate portions 1a and 1b on which the resonance conductor, the input / output coupling electrode layer, the inter-stage coupling electrode layer 7 and the outer conductor layer are formed are laminated and adhered to each other, whereby a combline type dielectric filter is provided. Is obtained. An equivalent circuit of this dielectric filter is shown in FIG. In FIG. 4, C1 represents an input capacitor composed of the input coupling electrode layer 5, and C2
Represents an output capacitor composed of the output coupling electrode layer 5, and C3 represents an interstage coupling capacitor composed of the interstage coupling electrode layer 7.
【０００８】このように構成した誘電体フィルタにおい
ては、誘電体基板部分の内面に形成される入出力結合用
電極層５、６及び段間結合用電極層７の大きさ（面積）
及び（または）一方の誘電体基板部分1aに挿置された各
共振導体とその基板部分の積層されることになる内面上
の入出力結合用電極層５、６及び段間結合用電極層７と
の間の間隔をそれぞれれ変えることにより結合容量を調
整することができる。この場合、入出力結合用電極層
５、６及び段間結合用電極層７の設けられる内面は誘電
体基板において最大の面であるので、入出力結合用電極
層５、６及び段間結合用電極層７は小さい面積から比較
的大きい面積まで広い範囲で設定することができ、結合
容量の選定範囲を広く取ることができ、また積層後、入
出力結合用電極層５、６及び段間結合用電極層７は誘電
体基板内に位置することになるので外部の電磁界の影響
を実施質的に避けることができる。図示誘電体フィルタ
の実際の製造においては、誘電体基板１は予め二つの基
板部分に分けて構成するか、または誘電体基板１の上面
と下面のほぼ中間位置に共振導体２、３を挿置し、これ
らの共振導体２、３を通る平面に平行で、しかも共振導
体２、３から予定の間隔（これは設定すべき結合容量の
大きさに応じて決められ得る）離れた面に沿って二つの
基板部分に分割することができる。In the thus constructed dielectric filter, the size (area) of the input / output coupling electrode layers 5 and 6 and the inter-stage coupling electrode layer 7 formed on the inner surface of the dielectric substrate portion.
And / or each resonance conductor inserted in one of the dielectric substrate portions 1a and the input / output coupling electrode layers 5 and 6 and the inter-stage coupling electrode layer 7 on the inner surface of the substrate portion to be laminated. The coupling capacitance can be adjusted by changing the interval between the and. In this case, since the inner surface on which the input / output coupling electrode layers 5 and 6 and the interstage coupling electrode layer 7 are provided is the largest surface in the dielectric substrate, the input / output coupling electrode layers 5 and 6 and the interstage coupling electrode layers are formed. The electrode layer 7 can be set in a wide range from a small area to a relatively large area, a wide selection range of the coupling capacitance can be taken, and after the lamination, the input / output coupling electrode layers 5 and 6 and the inter-stage coupling can be formed. Since the working electrode layer 7 is located in the dielectric substrate, the influence of the external electromagnetic field can be practically avoided. In the actual manufacture of the illustrated dielectric filter, the dielectric substrate 1 is preliminarily divided into two substrate portions, or the resonance conductors 2 and 3 are placed at a substantially intermediate position between the upper surface and the lower surface of the dielectric substrate 1. However, along a plane parallel to the plane passing through these resonance conductors 2 and 3 and further away from the resonance conductors 2 and 3 by a predetermined distance (this can be determined according to the magnitude of the coupling capacitance to be set). It can be divided into two substrate parts.
【０００９】ところで、図示実施例では、入出力電極層
及び段間結合用電極層は二つの基板部分のそれぞれに設
けているが、積層した際に隙間が生じないようにできれ
ば、それらの電極層は、どちらか一方の基板部分にのみ
設けることもできる。また、共振導体の断面形状は円形
である必要はなく、必要に応じて任意の形状に構成する
ことができる。さらに、誘電体基板内に共振導体がその
上面または下面から予定の間隔離れた位置に位置するよ
うに設け（この場合、共振導体を誘電体基板内に設け、
誘電体基板の上面または下面を切削して共振導体と切削
した面との間隔が予定の値となるようにしてもよい）、
共振導体から予定の間隔に位置した上面または下面上の
各共振導体の開放端に対応した位置に入出力電極層を設
け、そして共振導体を跨ぐ位置に段間結合用電極層を設
け、これらの電極層の設けられた上面または下面上を覆
うように別個に設けた誘電体覆体を接着することによ
り、誘電体フィルタを構成することもできる。By the way, in the illustrated embodiment, the input / output electrode layer and the inter-stage coupling electrode layer are provided on each of the two substrate portions, but if it is possible to prevent a gap from being formed when they are laminated, those electrode layers are provided. Can be provided only on one of the substrate portions. Moreover, the cross-sectional shape of the resonance conductor does not have to be circular, and can be formed in any shape as needed. Further, the resonance conductor is provided in the dielectric substrate so as to be positioned at a predetermined distance from the upper surface or the lower surface thereof (in this case, the resonance conductor is provided in the dielectric substrate,
The upper surface or the lower surface of the dielectric substrate may be cut so that the distance between the resonant conductor and the cut surface becomes a predetermined value),
An input / output electrode layer is provided at a position corresponding to the open end of each resonance conductor on the upper or lower surface located at a predetermined distance from the resonance conductor, and an inter-stage coupling electrode layer is provided at a position straddling the resonance conductor. It is also possible to form a dielectric filter by bonding a separately provided dielectric cover so as to cover the upper surface or the lower surface provided with the electrode layer.
【００１０】[0010]
【発明の効果】以上説明してきたように、本発明による
誘電体フィルタにおいては、互いに積層される内面に共
振導体を跨いで段間結合用電極層を設けているので、フ
ィルタの小形化、薄型化の要求を満たしながらしかも外
部の電磁界の影響を受けることなしにフィルタ特性にお
ける減衰域に極を形成することができ、その結果優れた
減衰特性を得ることができる。また本発明では、上記の
段間結合の構成に加えて誘電基板内に設けられた共振導
体に対して調整可能な予定の間隔をおいた比較的大きな
面積を取れる内面上に入出力結合用電極層を形成して実
施した場合には、高精度の加工処理を必要とせずに結合
容量を容易に選定することができ、しかも入出力及び段
間結合用電極層の大きさも比較的大きな自由度をもつて
設定できるので結合容量の調整範囲を大きく取ることが
できる。また入出力結合用電極層及び段間結合用電極層
は誘電基板内に位置しているので、この種の誘電体フィ
ルタに対する小型化の要求を十分に満たすだけでなく、
動作時における外部電磁界の影響も実質的に避けること
ができ、安定した動作特性を得ることができるようにな
る。従って本発明は、構造的に製造が簡単で小形化で
き、また性能的には結合容量の調整範囲の自由度を大き
く取れしかも外部電磁界の影響の受けにくく、減衰域に
有極化した誘電体フィルタを提供することができる。As described above, in the dielectric filter according to the present invention, since the inter-stage coupling electrode layer is provided on the inner surfaces laminated on each other across the resonance conductor, the filter can be made compact and thin. It is possible to form a pole in the attenuation region of the filter characteristic while satisfying the requirement of optimization and without being affected by an external electromagnetic field, and as a result, it is possible to obtain an excellent attenuation characteristic. Further, in the present invention, in addition to the above-described inter-stage coupling structure, the input / output coupling electrode is provided on the inner surface which has a relatively large area with a predetermined adjustable distance with respect to the resonance conductor provided in the dielectric substrate. When the layers are formed and implemented, the coupling capacitance can be easily selected without requiring high-precision processing, and the size of the input / output and inter-stage coupling electrode layers is relatively large. Since it can be set with, the adjustment range of the coupling capacitance can be widened. Further, since the input / output coupling electrode layer and the inter-stage coupling electrode layer are located in the dielectric substrate, not only the requirement for miniaturization of this type of dielectric filter is sufficiently satisfied,
The influence of the external electromagnetic field during operation can be substantially avoided, and stable operation characteristics can be obtained. Therefore, the present invention is structurally simple to manufacture and can be miniaturized. Further, in terms of performance, the degree of freedom of the adjustment range of the coupling capacitance can be made large, and it is not easily affected by the external electromagnetic field. A body filter can be provided.
【図１】 本発明の一実施例による誘電体フィルタを示
す概略斜視図。FIG. 1 is a schematic perspective view showing a dielectric filter according to an embodiment of the present invention.
【図２】 図１の誘電体フィルタを構成する誘電体基板
部分を分離した状態でその内面部分を斜め上方から見た
概略分解斜視図。FIG. 2 is a schematic exploded perspective view of the inner surface portion of the dielectric substrate portion of the dielectric filter of FIG. 1 in a separated state as seen from diagonally above.
【図３】 図１の誘電体フィルタを構成する誘電体基板
部分を分離した状態でその内面部分を斜め下方から見た
概略分解斜視図。FIG. 3 is a schematic exploded perspective view of an inner surface portion of the dielectric filter portion of the dielectric filter of FIG. 1 in a state where the dielectric substrate portion is separated from an oblique lower side.
【図４】 図１〜図３に示す誘電体フィルタの等価回路
を示す回路線図。FIG. 4 is a circuit diagram showing an equivalent circuit of the dielectric filter shown in FIGS.
【図５】 図１〜図３に示す誘電体フィルタのフィルタ
特性を示すグラフ。FIG. 5 is a graph showing filter characteristics of the dielectric filters shown in FIGS.
１：誘電体基板 ２：共振導体 ３：共振導体 ４：外部導体層 ５：入力結合用電極層 ６：出力結合用電極層 ７：段間結合用電極層 ８：入力端子 ９：出力端子 10：スペース 1: Dielectric Substrate 2: Resonant Conductor 3: Resonant Conductor 4: External Conductor Layer 5: Input Coupling Electrode Layer 6: Output Coupling Electrode Layer 7: Interstage Coupling Electrode Layer 8: Input Terminal 9: Output Terminal 10: space
Claims (2)
位置に、前端面から後端面までのびる複数の共振導体を
並行して挿置し、各共振導体の一端を誘電体基板の外周
面に設けた外部導体に接続して短絡端とし、また他端を
上記外部導体に接続せずに開放端とし、これらの共振導
体を通る平面に平行でしかもこれらの共振導体を切らな
い面で誘電体基板を二つの誘電体基板部分に分けて構成
し、積層される誘電体基板部分の少なくとも一方の内面
上に共振導体間を跨いで段間結合用電極層を設けたこと
を特徴とする誘電体フィルタ。1. A plurality of resonant conductors extending from a front end face to a rear end face are inserted in parallel at a substantially intermediate position between an upper surface and a lower surface of a dielectric substrate, and one end of each resonant conductor is attached to the dielectric substrate. A surface that is parallel to a plane passing through these resonance conductors and that does not cut these resonance conductors, which is connected to an outer conductor provided on the outer peripheral surface to form a short-circuit end and the other end is an open end without being connected to the outer conductor And the dielectric substrate is divided into two dielectric substrate portions, and an inter-stage coupling electrode layer is provided on the inner surface of at least one of the laminated dielectric substrate portions across the resonance conductors. Dielectric filter.
位置に、前端面から後端面までのびる複数の共振導体を
並行して挿置し、各共振導体の一端を誘電体基板の外周
面に設けた外部導体に接続して短絡端とし、また他端を
上記外部導体に接続せずに開放端とし、これらの共振導
体を通る平面に平行でしかもこれらの共振導体を切らな
い面で誘電体基板を二つの誘電体基板部分に分けて構成
し、積層される誘電体基板部分の少なくとも一方の内面
上に共振導体間を跨いで段間結合用電極層を設け、さら
に各共振導体の開放端に相対する上記内面上の位置に入
力結合用電極層及び出力結合用電極層を設けたことを特
徴とする誘電体フィルタ。2. A plurality of resonant conductors extending from a front end face to a rear end face are inserted in parallel at a substantially intermediate position between an upper surface and a lower surface of a dielectric substrate, and one end of each resonant conductor is attached to the dielectric substrate. A surface that is parallel to a plane passing through these resonance conductors and that does not cut these resonance conductors, which is connected to an outer conductor provided on the outer peripheral surface to form a short-circuit end and the other end is an open end without being connected to the outer conductor The dielectric substrate is divided into two dielectric substrate portions, and an inter-stage coupling electrode layer is provided on the inner surface of at least one of the laminated dielectric substrate portions across the resonance conductors. A dielectric filter, wherein an input coupling electrode layer and an output coupling electrode layer are provided at positions on the inner surface facing the open end of the.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28847592A JPH06140807A (en) | 1992-10-27 | 1992-10-27 | Dielectric filter |
| FI934732A FI114834B (en) | 1992-10-27 | 1993-10-26 | Dielectric filter |
| US08/141,057 US5402090A (en) | 1992-10-27 | 1993-10-26 | Dielectric filter comprised of two dielectric substrates and coupling electrodes disposed with the substrates |
| KR1019930022479A KR100371607B1 (en) | 1992-10-27 | 1993-10-27 | Dielectric filter |
| DE69325627T DE69325627T2 (en) | 1992-10-27 | 1993-10-27 | Dielectric filter |
| EP93308578A EP0595623B1 (en) | 1992-10-27 | 1993-10-27 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28847592A JPH06140807A (en) | 1992-10-27 | 1992-10-27 | Dielectric filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06140807A true JPH06140807A (en) | 1994-05-20 |
Family
ID=17730693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28847592A Pending JPH06140807A (en) | 1992-10-27 | 1992-10-27 | Dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06140807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980063696A (en) * | 1996-12-03 | 1998-10-07 | 다까노야스아끼 | Pole dielectric filter and dielectric duplexer using the same |
| US6313797B1 (en) * | 1998-10-22 | 2001-11-06 | Murata Manufacturing Co., Ltd. | Dielectric antenna including filter, dielectric antenna including duplexer, and radio apparatus |
-
1992
- 1992-10-27 JP JP28847592A patent/JPH06140807A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980063696A (en) * | 1996-12-03 | 1998-10-07 | 다까노야스아끼 | Pole dielectric filter and dielectric duplexer using the same |
| US6313797B1 (en) * | 1998-10-22 | 2001-11-06 | Murata Manufacturing Co., Ltd. | Dielectric antenna including filter, dielectric antenna including duplexer, and radio apparatus |
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