JPH06303007A - Dielectric filter - Google Patents
Dielectric filterInfo
- Publication number
- JPH06303007A JPH06303007A JP10977493A JP10977493A JPH06303007A JP H06303007 A JPH06303007 A JP H06303007A JP 10977493 A JP10977493 A JP 10977493A JP 10977493 A JP10977493 A JP 10977493A JP H06303007 A JPH06303007 A JP H06303007A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- dielectric
- conductor film
- dielectric block
- input
- 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
Links
- 239000004020 conductor Substances 0.000 claims abstract description 125
- 230000008878 coupling Effects 0.000 claims abstract description 23
- 238000010168 coupling process Methods 0.000 claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 claims abstract description 23
- 238000010586 diagram Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
(57)【要約】
【目的】 実装が容易で、入出力結合容量を十分広い範
囲にわたり設定可能で所望の周波数特性を容易に得るこ
とができる誘電体フィルタを提供する。
【構成】 誘電体ブロック２に貫通孔４Ａ，４Ｂを形成
し、各貫通孔の内面に内導体６Ａ，６Ｂを形成し、誘電
体ブロック２の側面に外導体８を形成し、誘電体ブロッ
ク２の下端面に導体膜１０を形成して内導体６Ａ，６Ｂ
と外導体８とを短絡させる。誘電体ブロック２の側面の
うちの１つには内導体６Ａ，６Ｂのそれぞれに対応する
位置に外導体８と絶縁された導体膜片１６Ａ，１６Ｂを
形成し、これら導体膜片の位置において誘電体ブロック
２に切欠部１８Ａ，１８Ｂを形成し、該切欠部の内面に
導体膜片１６Ａ，１６Ｂと接続せる導体膜を形成して入
出力用電極とする。１２Ａ，１２Ｂは誘電体ブロック２
の上端面に形成され内導体６Ａ，６Ｂと接続せる導体膜
片である。
(57) [Summary] [Object] To provide a dielectric filter that is easy to mount, can set input / output coupling capacitance over a sufficiently wide range, and can easily obtain desired frequency characteristics. [Structure] Through holes 4A and 4B are formed in the dielectric block 2, inner conductors 6A and 6B are formed on the inner surface of each through hole, and outer conductors 8 are formed on the side surfaces of the dielectric block 2. Conductor film 10 is formed on the lower end surface of the inner conductor 6A, 6B
And the outer conductor 8 are short-circuited. Conductor film pieces 16A and 16B insulated from the outer conductor 8 are formed on one of the side surfaces of the dielectric block 2 at positions corresponding to the inner conductors 6A and 6B, respectively. Cutouts 18A and 18B are formed in the body block 2, and a conductor film that is connected to the conductor film pieces 16A and 16B is formed on the inner surface of the cutout to form an input / output electrode. 12A and 12B are dielectric blocks 2
Is a conductor film piece which is formed on the upper end surface of and can be connected to the inner conductors 6A and 6B.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、λ／４同軸型誘電体共
振器を用いた誘電体フィルタに関し、特に容易に所望の
外部回路と接続でき所望の入出力結合及び所望の周波数
特性を得ることのできる高周波誘電体フィルタに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter using a .lambda. / 4 coaxial dielectric resonator, and particularly, it can be easily connected to a desired external circuit to obtain a desired input / output coupling and a desired frequency characteristic. A high frequency dielectric filter capable of
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】λ／４
同軸型誘電体共振器を用いて構成される高周波誘電体フ
ィルタでは、周波数特性を良好なものとするために入出
力結合を適正に設定することが要求される。PRIOR ART AND PROBLEM TO BE SOLVED BY THE INVENTION λ / 4
In a high frequency dielectric filter configured by using a coaxial type dielectric resonator, it is required to properly set input / output coupling in order to obtain good frequency characteristics.
【０００３】従来の誘電体フィルタでは、入出力結合を
とるために、両端の共振器のそれぞれの貫通孔内に絶縁
性樹脂を介して導電性ピンを挿入し、該ピンと貫通孔内
面の内導体との間で容量結合を形成していた。この容量
結合の大きさは、該導電性ピンの直径や長さを変化させ
ることで、所望値に設定される。ところが、この方法で
は、該導電性ピンと入出力用のストリップラインとの接
続のための手段が複雑となり実装が面倒である。また、
構成部品数が多く、コスト高になっていた。In the conventional dielectric filter, in order to perform input / output coupling, a conductive pin is inserted into each through hole of the resonators at both ends via an insulating resin, and the inner conductor of the pin and the inner surface of the through hole is inserted. Capacitive coupling was formed between and. The magnitude of this capacitive coupling is set to a desired value by changing the diameter and length of the conductive pin. However, in this method, the means for connecting the conductive pins and the strip lines for input and output are complicated, and the mounting is troublesome. Also,
The number of components was large and the cost was high.
【０００４】そこで、誘電体フィルタを構成する誘電体
ブロックの１側面において両端の共振器に対応する位置
に外導体と絶縁された導体膜からなる入出力用電極を形
成し、該側面を直接基板上に接触させて固定することに
より、該基板に形成されている入出力用ストリップライ
ンと誘電体フィルタの入出力用電極との接続を同時に行
うことが提案された。そして、入出力用電極と両端の共
振器の内導体との間を、開放端面（即ち、内導体と外導
体とが短絡されていない端面）に取付けたチップコンデ
ンサを介して接続することがなされた。ところが、この
方法であると、別部品としてチップコンデンサが必要で
あり、その取付け作業も必要となるので、実装は未だ十
分に簡素化されたとはいえなかった。Therefore, an input / output electrode made of a conductor film insulated from an outer conductor is formed on one side surface of the dielectric block constituting the dielectric filter at positions corresponding to the resonators at both ends, and the side surface is directly connected to the substrate. It has been proposed that the input / output stripline formed on the substrate and the input / output electrodes of the dielectric filter be simultaneously connected by contacting and fixing the same on the upper side. Then, the input / output electrodes and the inner conductors of the resonators at both ends are connected via a chip capacitor attached to an open end face (that is, an end face where the inner conductor and the outer conductor are not short-circuited). It was However, with this method, a chip capacitor is required as a separate component, and mounting work is also required, so that it cannot be said that the mounting has been sufficiently simplified.
【０００５】そこで、該チップコンデンサを使用せずに
入出力結合をとる方法として、開放端面において内導体
と接続せる導体膜片を形成し且つ入出力用電極と接続せ
る導体膜片を形成し、これら導体膜片を対向させて容量
を形成する様にパターニングすることがなされた（特公
平３−４０９６２号公報参照）。これによれば、確かに
部品点数は少なくなるし、実装作業上からも有利であ
る。しかし、この方法では、入出力結合の容量は平面
（開放端面）上での導体膜片どうしの対向によるもので
あるため、広い範囲にわたって所望の大きさに設定する
ことが難しいという問題があった。Therefore, as a method for achieving input / output coupling without using the chip capacitor, a conductor film piece that can be connected to the inner conductor at the open end surface and a conductor film piece that can be connected to the input / output electrode are formed. Patterning was performed so that these conductor film pieces faced each other to form a capacitor (see Japanese Patent Publication No. 3-40962). According to this, the number of parts is surely reduced, and it is also advantageous in mounting work. However, this method has a problem that it is difficult to set a desired size over a wide range because the capacitance of the input / output coupling is due to the conductor film pieces facing each other on a flat surface (open end surface). .
【０００６】本発明は、以上の様な問題点を解決し、実
装が容易で、且つ入出力結合容量を十分広い範囲にわた
り設定可能で所望の周波数特性を容易に得ることができ
る誘電体フィルタを提供することを目的とするものであ
る。The present invention solves the above problems and provides a dielectric filter which is easy to mount, can set input / output coupling capacitance over a sufficiently wide range, and can easily obtain a desired frequency characteristic. It is intended to be provided.
【０００７】[0007]
【課題を解決するための手段】本発明によれば、上記目
的を達成するものとして、誘電体ブロックに少なくとも
１つの貫通孔を複数の場合には互いに平行に形成し、各
貫通孔の内面に導体膜を形成して内導体とし、前記誘電
体ブロックの内導体と交わらない側面に導体膜を形成し
て外導体とし、前記貫通孔が開口せる前記誘電体ブロッ
クの２つの端面のうちの一方に導体膜を形成して前記内
導体と前記外導体とを短絡させ、前記誘電体ブロックの
側面の少なくとも１つには少なくとも１つの切欠部を形
成し、該切欠部の内面に前記外導体と絶縁された導体膜
を形成して入出力用電極としてなることを特徴とする、
誘電体フィルタ、が提供される。According to the present invention, in order to achieve the above-mentioned object, at least one through hole is formed in the dielectric block in parallel to each other in the case of a plurality of holes, and the inner surface of each through hole is formed. One of two end faces of the dielectric block, in which a conductor film is formed to form an inner conductor, and a conductor film is formed to a side surface of the dielectric block that does not intersect with the inner conductor to form an outer conductor. Forming a conductor film on the inner conductor to short-circuit the inner conductor and the outer conductor, forming at least one notch on at least one side surface of the dielectric block, and forming an outer conductor on the inner surface of the notch. An insulated conductor film is formed to serve as an input / output electrode,
A dielectric filter is provided.
【０００８】本発明の一態様においては、前記誘電体ブ
ロックの側面には、前記入出力用電極と接続し且つ前記
外導体と絶縁せる導体膜片を形成してなる。In one aspect of the present invention, a conductor film piece that is connected to the input / output electrodes and is insulated from the outer conductor is formed on a side surface of the dielectric block.
【０００９】本発明の他の態様においては、前記誘電体
ブロックの２つの端面のうちの他方には、前記各内導体
とそれぞれ接続せる導体膜片を形成してなる。In another aspect of the present invention, conductor film pieces that are respectively connected to the inner conductors are formed on the other of the two end faces of the dielectric block.
【００１０】本発明の更に別の態様においては、前記誘
電体ブロックに前記貫通孔が複数形成されており、前記
誘電体ブロックの２つの端面のうちの他方には、隣接貫
通孔の開口間に前記外導体と接続せる段間結合用導体膜
片を形成してなる。In a further aspect of the present invention, the dielectric block is formed with a plurality of through holes, and the other end of the two end faces of the dielectric block is provided between the openings of adjacent through holes. An inter-stage coupling conductor film piece that can be connected to the outer conductor is formed.
【００１１】また、本発明によれば、上記目的を達成す
るものとして、誘電体ブロックに少なくとも１つの貫通
孔を複数の場合には互いに平行に形成し、各貫通孔の内
面に導体膜を形成して内導体とし、前記誘電体ブロック
の内導体と交わらない側面に導体膜を形成して外導体と
し、前記貫通孔が開口せる前記誘電体ブロックの２つの
端面のうちの一方に導体膜を形成して前記内導体と前記
外導体とを短絡させ、前記誘電体ブロックを複数並列配
置して結合させ、両端の内導体のそれぞれに対応して前
記誘電体ブロックの側面の少なくとも１つに少なくとも
１つの切欠部を形成し、該切欠部の内面に前記外導体と
絶縁された導体膜を形成して入出力用電極としてなるこ
とを特徴とする、誘電体フィルタ、が提供される。Further, according to the present invention, in order to achieve the above object, at least one through hole is formed in parallel with each other in the case of a plurality of dielectric blocks, and a conductor film is formed on the inner surface of each through hole. As an inner conductor, a conductor film is formed on a side surface of the dielectric block that does not intersect with the inner conductor to form an outer conductor, and a conductor film is formed on one of two end surfaces of the dielectric block in which the through holes are opened. Are formed to short-circuit the inner conductor and the outer conductor, a plurality of the dielectric blocks are arranged in parallel and coupled, and at least one of the side surfaces of the dielectric block corresponds to at least one of the inner conductors at both ends. There is provided a dielectric filter, wherein one notch is formed, and a conductor film insulated from the outer conductor is formed on the inner surface of the notch to serve as an input / output electrode.
【００１２】[0012]
【実施例】以下、図面を参照しながら本発明の具体的実
施例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.
【００１３】図１は本発明の誘電体フィルタの一実施例
を示す一部切欠斜視図である。図において、２は直方体
形状の誘電体ブロックであり、該ブロック２としては例
えばＢａＴｉＯ3 系の比誘電率９３の材料を使用するこ
とができる。該ブロック２には上下方向（Ｚ方向）の２
つの円形貫通孔４Ａ，４Ｂが形成されている。これら貫
通孔はＸ方向に適宜の距離隔てられて配列されている。
該貫通孔４Ａ，４Ｂの内面には導体膜が付されており、
該導体膜により内導体６Ａ，６Ｂが形成されている。ま
た、誘電体ブロック２の４つの側面（Ｘ−Ｚ面と平行な
外面及びＹ−Ｚ面と平行な外面）には一部を除いて導体
膜が付されており、該導体膜により外導体８が形成され
ている。また、ブロック２の底面にも導体膜１０が付さ
れており、これにより内導体６Ａ，６Ｂと外導体８とが
短絡されている。かくして、外導体を共通化した２つの
同軸型誘電体共振器の配列が形成されている。FIG. 1 is a partially cutaway perspective view showing an embodiment of the dielectric filter of the present invention. In the figure, reference numeral 2 is a rectangular parallelepiped dielectric block. As the block 2, for example, a BaTiO 3 -based material having a relative dielectric constant 93 can be used. The block 2 has 2 in the vertical direction (Z direction).
Two circular through holes 4A and 4B are formed. These through holes are arranged at an appropriate distance in the X direction.
A conductor film is attached to the inner surfaces of the through holes 4A and 4B,
Inner conductors 6A and 6B are formed by the conductor film. Also, a conductor film is attached to the four side surfaces (the outer surface parallel to the XZ plane and the outer surface parallel to the YZ plane) of the dielectric block 2 except for a part thereof, and the conductor film forms an outer conductor. 8 is formed. A conductor film 10 is also attached to the bottom surface of the block 2 so that the inner conductors 6A and 6B and the outer conductor 8 are short-circuited. Thus, an array of two coaxial type dielectric resonators having a common outer conductor is formed.
【００１４】ブロック２の上面には、各貫通孔の周囲
に、内導体６Ａに接続せる環状の導体膜片１２Ａ及び内
導体６Ｂに接続せる環状の導体膜片１２Ｂが形成されて
いる。また、ブロック２の上面には、導体膜片１２Ａと
１２Ｂとの間に直線状の段間結合用導体膜片１４が形成
されており、その両端が外導体８に接続されている。こ
の導体膜片１４により２つの誘電体共振器間が誘導結合
されている。On the upper surface of the block 2, a ring-shaped conductor film piece 12A connected to the inner conductor 6A and a ring-shaped conductor film piece 12B connected to the inner conductor 6B are formed around each through hole. Further, on the upper surface of the block 2, a linear inter-stage coupling conductor film piece 14 is formed between the conductor film pieces 12A and 12B, and both ends thereof are connected to the outer conductor 8. The conductor film piece 14 inductively couples the two dielectric resonators.
【００１５】尚、誘電体ブロック２の１つの側面（図に
おける手前側の面）には、上記導体膜片１２Ａに近接せ
る位置に外導体８から絶縁分離された導体膜片１６Ａが
形成されており、上記導体膜片１２Ｂに近接せる位置に
外導体８から絶縁分離された導体膜片１６Ｂが形成され
ている。そして、これら導体膜片１６Ａ及び導体膜片１
６Ｂの位置において、誘電体ブロック２には、それぞれ
貫通孔４Ａ，４Ｂの方へと延びた矩形の切欠部１８Ａ，
１８Ｂが形成されており、これら切欠部の内面にも導体
膜片１６Ａ，１６Ｂと接続されて導体膜が形成されてい
る。この導体膜が入出力用電極となる。かくして、切欠
部１８Ａの入力用電極と導体膜片１２Ａとの間で入力側
の容量結合が形成され、切欠部１８Ｂの出力用電極と導
体膜片１２Ｂとの間で出力側の容量結合が形成されてい
る。A conductor film piece 16A, which is insulated from the outer conductor 8, is formed on one side surface (front surface in the figure) of the dielectric block 2 at a position close to the conductor film piece 12A. Thus, a conductor film piece 16B which is insulated from the outer conductor 8 is formed at a position close to the conductor film piece 12B. Then, the conductor film piece 16A and the conductor film piece 1
At the position 6B, the dielectric block 2 has rectangular notches 18A, which extend toward the through holes 4A, 4B, respectively.
18B is formed, and a conductor film is also formed on the inner surfaces of these cutout portions so as to be connected to the conductor film pieces 16A and 16B. This conductor film serves as an input / output electrode. Thus, the input side capacitive coupling is formed between the input electrode of the cutout portion 18A and the conductor film piece 12A, and the output side capacitive coupling is formed between the output electrode of the cutout portion 18B and the conductor film piece 12B. Has been done.
【００１６】図２に本実施例の等価回路を示す。ＣINは
入力側の結合容量であり、ＣOUT は出力側の結合容量で
ある。FIG. 2 shows an equivalent circuit of this embodiment. C IN is the coupling capacitance on the input side, and C OUT is the coupling capacitance on the output side.
【００１７】図３〜図１１は、以上の様な本発明実施例
の誘電体フィルタの周波数特性（透過特性）を示すもの
である。これらは、図１における各寸法を、Ｌ1 ＝４．
３ｍｍ、Ｌ2 ＝７．６ｍｍ、Ｔ1 ＝Ｔ2 ＝１．８ｍｍと
した場合のものである。そして、図３〜図５はＳ2 ＝
０．６ｍｍ、Ｓ3 ＝０．５ｍｍとしてＳ1 を各図に示さ
れている寸法とした場合のものであり、図６〜図８はＳ
1 ＝０．５ｍｍ、Ｓ3 ＝０．５ｍｍとしてＳ2 を各図に
示されている寸法とした場合のものであり、図９〜図１
１はＳ1 ＝０．５ｍｍ、Ｓ2 ＝０．６ｍｍとしてＳ3 を
各図に示されている寸法とした場合のものである。3 to 11 show the frequency characteristics (transmission characteristics) of the dielectric filter according to the embodiment of the present invention as described above. These have the same dimensions as those in FIG. 1, L 1 = 4.
3 mm, L 2 = 7.6 mm, T 1 = T 2 = 1.8 mm. Then, in FIGS. 3 to 5, S 2 =
It is assumed that S 1 is 0.6 mm and S 3 = 0.5 mm, and S 1 is the dimension shown in each figure.
1 to 0.5 mm and S 3 = 0.5 mm, and S 2 has the dimensions shown in each figure.
1 is the case where S 1 = 0.5 mm and S 2 = 0.6 mm and S 3 has the dimensions shown in the respective drawings.
【００１８】図３〜図１１から、Ｓ1 〜Ｓ3 を適宜変化
させ入出力結合容量を変化させることにより、周波数特
性を十分に変化させることができ、Ｓ1 ＝０．５ｍｍ、
Ｓ2＝０．６ｍｍ、Ｓ3 ＝０．５ｍｍとするとにより、
最も好ましい周波数特性が得られることがわかる。この
様に周波数特性の設定が容易であるのは、入出力結合容
量が単に導体膜片１２Ａ，１２Ｂと電極側導体膜との平
面的な配置による容量のみによるものでなく、更に切欠
部１８Ａ，１８Ｂ内の導体膜と内導体６Ａ，６Ｂとの距
離が近接することによる該内導体との間の容量の寄与が
大きくなるからであると考えられる。From FIGS. 3 to 11, it is possible to sufficiently change the frequency characteristics by appropriately changing S 1 to S 3 and changing the input / output coupling capacitance, S 1 = 0.5 mm,
By setting S 2 = 0.6 mm and S 3 = 0.5 mm,
It can be seen that the most preferable frequency characteristic is obtained. Thus, the setting of the frequency characteristic is easy not only because the input / output coupling capacitance is simply due to the planar arrangement of the conductor film pieces 12A and 12B and the electrode side conductor film, but also when the cutout portion 18A, It is considered that this is because the contribution of the capacitance between the conductor film in 18B and the inner conductors 6A and 6B is increased due to the close distance.
【００１９】以上の様な実施例によれば、同一の側面側
に入出力用電極を形成したので、外部回路との接続を同
一平面上で行うことができる。また、入出力用電極と接
続された導体膜片１６Ａ，１６Ｂが設けられているの
で、外部回路との接続の際のハンダ付け等が容易であ
る。According to the above-mentioned embodiments, since the input / output electrodes are formed on the same side surface side, the connection with the external circuit can be made on the same plane. Further, since the conductor film pieces 16A and 16B connected to the input / output electrodes are provided, soldering or the like when connecting to an external circuit is easy.
【００２０】図１２及び図１３は、切欠部１８Ａの形状
の変形例を示す部分斜視図である。図１２の例では曲面
状に切欠かれており、図１３の例では斜めに切欠かれて
いる。12 and 13 are partial perspective views showing modifications of the shape of the cutout portion 18A. In the example of FIG. 12, the cutout is curved, and in the example of FIG. 13, the cutout is oblique.
【００２１】尚、以上の実施例では２段のフィルタが示
されているが、３段以上の場合も同様にして入出力結合
をとることができる。また、１段の場合も可能であり、
この場合には対向する側面に切欠部及び入出力用電極を
形成すればよい。Although the two-stage filter is shown in the above embodiments, the input / output coupling can be similarly performed in the case of three or more stages. It is also possible to have a single stage,
In this case, the notch and the input / output electrodes may be formed on the opposite side surfaces.
【００２２】上記実施例では、１つの誘電体ブロックを
用いているが、複数の誘電体ブロックを用いることもで
きる。図１４は、その実施例を示す断面図である。本図
において、上記各図におけると同一の機能を有する部材
には同一の符号が付されている。本実施例では、２つの
誘電体ブロック２２，２４を用いており、各誘電体ブロ
ックには、それぞれ内導体６Ａ，６Ｂ、外導体８及び導
体膜１０が形成されていて、共振器を構成している。２
６は段間結合用誘電体ブロックであり、その２つの孔の
内面には導体膜が形成されており、これらの孔には導電
性ピン２８Ａ，２８Ｂの一端が挿入されている。該導電
性ピンの他端は、各誘電体ブロック２２，２４の貫通孔
内に挿入され内導体６Ａ，６Ｂと電気的に接続されてい
る。図示されている様に、誘電体ブロック２２，２４に
は、それぞれ切欠部１８Ａ，１８Ｂが形成されており、
その内面には導体膜が形成されて入出力用電極を構成し
ている。本実施例においても、上記図１〜１３に関し説
明した実施例と同様の効果を得ることができる。Although one dielectric block is used in the above embodiment, a plurality of dielectric blocks may be used. FIG. 14 is a sectional view showing the embodiment. In this figure, members having the same functions as those in the above figures are designated by the same reference numerals. In this embodiment, two dielectric blocks 22 and 24 are used, and the inner conductors 6A and 6B, the outer conductor 8 and the conductor film 10 are formed in each of the dielectric blocks to form a resonator. ing. Two
Reference numeral 6 denotes a dielectric block for interstage coupling, a conductor film is formed on the inner surfaces of the two holes, and one ends of the conductive pins 28A and 28B are inserted into these holes. The other ends of the conductive pins are inserted into the through holes of the dielectric blocks 22 and 24 and are electrically connected to the inner conductors 6A and 6B. As shown in the drawing, the dielectric blocks 22 and 24 have cutouts 18A and 18B, respectively,
A conductor film is formed on the inner surface thereof to form an input / output electrode. Also in this embodiment, the same effect as that of the embodiment described with reference to FIGS. 1 to 13 can be obtained.
【００２３】[0023]
【発明の効果】以上説明した様に、本発明の誘電体フィ
ルタによれば、誘電体ブロックに切欠部を形成し該切欠
部の内面に入出力用電極となる導体膜を形成したので、
実装が容易であることに加えて、入出力結合容量を十分
広い範囲にわたり設定可能で所望の周波数特性を容易に
得ることができる。As described above, according to the dielectric filter of the present invention, since the notch is formed in the dielectric block and the conductor film serving as the input / output electrode is formed on the inner surface of the notch,
In addition to being easy to implement, the input / output coupling capacitance can be set over a sufficiently wide range, and desired frequency characteristics can be easily obtained.
【図１】本発明の誘電体フィルタの一実施例を示す一部
切欠斜視図である。FIG. 1 is a partially cutaway perspective view showing an embodiment of a dielectric filter of the present invention.
【図２】図１の誘電体フィルタの等価回路図である。FIG. 2 is an equivalent circuit diagram of the dielectric filter of FIG.
【図３】図１の誘電体フィルタの周波数特性図である。FIG. 3 is a frequency characteristic diagram of the dielectric filter of FIG.
【図４】図１の誘電体フィルタの周波数特性図である。FIG. 4 is a frequency characteristic diagram of the dielectric filter of FIG.
【図５】図１の誘電体フィルタの周波数特性図である。5 is a frequency characteristic diagram of the dielectric filter of FIG.
【図６】図１の誘電体フィルタの周波数特性図である。6 is a frequency characteristic diagram of the dielectric filter of FIG.
【図７】図１の誘電体フィルタの周波数特性図である。7 is a frequency characteristic diagram of the dielectric filter of FIG.
【図８】図１の誘電体フィルタの周波数特性図である。8 is a frequency characteristic diagram of the dielectric filter of FIG.
【図９】図１の誘電体フィルタの周波数特性図である。9 is a frequency characteristic diagram of the dielectric filter of FIG.
【図１０】図１の誘電体フィルタの周波数特性図であ
る。10 is a frequency characteristic diagram of the dielectric filter of FIG.
【図１１】図１の誘電体フィルタの周波数特性図であ
る。11 is a frequency characteristic diagram of the dielectric filter of FIG.
【図１２】図１の誘電体フィルタの切欠部の形状の変形
例を示す部分斜視図である。FIG. 12 is a partial perspective view showing a modification of the shape of the cutout portion of the dielectric filter of FIG.
【図１３】図１の誘電体フィルタの切欠部の形状の変形
例を示す部分斜視図である。FIG. 13 is a partial perspective view showing a modification of the shape of the cutout portion of the dielectric filter of FIG.
【図１４】本発明の誘電体フィルタの一実施例を示す断
面図である。FIG. 14 is a sectional view showing an embodiment of the dielectric filter of the present invention.
２ 誘電体ブロック ４Ａ，４Ｂ 貫通孔 ６Ａ，６Ｂ 内導体 ８ 外導体 １０ 導体膜 １２Ａ，１２Ｂ 導体膜片 １４ 段間結合用導体膜片 １６Ａ，１６Ｂ 導体膜片 １８Ａ，１８Ｂ 切欠部 ２２，２４ 誘電体ブロック ２６ 段間結合用誘電体ブロック ２８Ａ，２８Ｂ 導電性ピン 2 Dielectric block 4A, 4B Through hole 6A, 6B Inner conductor 8 Outer conductor 10 Conductor film 12A, 12B Conductor film piece 14 Interstage coupling conductor film piece 16A, 16B Conductor film piece 18A, 18B Cutout portion 22, 24 Dielectric material Block 26 Inter-stage coupling dielectric block 28A, 28B Conductive pin
───────────────────────────────────────────────────── フロントページの続き (72)発明者 上田 克史 山口県宇部市大宇小串1978番地の５ 宇部 興産株式会社無機材料研究所内 (72)発明者 弘中 誠一 山口県宇部市大宇小串1978番地の５ 宇部 興産株式会社無機材料研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsushi Ueda 5 1978, Ou Kogushi, Ube City, Yamaguchi Prefecture Ube Industries Ltd., Inorganic Materials Laboratory (72) Inventor Seiichi Hironaka 5 Ube, 1978 Address, Ou Kogushi, Ube City, Yamaguchi Prefecture Kosan Inorganic Materials Research Center
Claims (5)
孔を複数の場合には互いに平行に形成し、各貫通孔の内
面に導体膜を形成して内導体とし、前記誘電体ブロック
の内導体と交わらない側面に導体膜を形成して外導体と
し、前記貫通孔が開口せる前記誘電体ブロックの２つの
端面のうちの一方に導体膜を形成して前記内導体と前記
外導体とを短絡させ、前記誘電体ブロックの側面の少な
くとも１つには少なくとも１つの切欠部を形成し、該切
欠部の内面に前記外導体と絶縁された導体膜を形成して
入出力用電極としてなることを特徴とする、誘電体フィ
ルタ。1. At least one through hole is formed in the dielectric block in parallel to each other when a plurality of through holes are formed, and a conductor film is formed on the inner surface of each through hole to form an inner conductor. An outer conductor is formed by forming a conductor film on the side surfaces that do not intersect, and a conductor film is formed on one of the two end faces of the dielectric block in which the through holes are opened to short-circuit the inner conductor and the outer conductor. At least one notch is formed on at least one side surface of the dielectric block, and a conductor film insulated from the outer conductor is formed on the inner surface of the notch to serve as an input / output electrode. , A dielectric filter.
出力用電極と接続し且つ前記外導体と絶縁せる導体膜片
を形成してなることを特徴とする、請求項１に記載の誘
電体フィルタ。2. The dielectric film according to claim 1, wherein a conductor film piece that is connected to the input / output electrodes and is insulated from the outer conductor is formed on a side surface of the dielectric block. Body filter.
の他方には、前記各内導体とそれぞれ接続せる導体膜片
を形成してなることを特徴とする、請求項１に記載の誘
電体フィルタ。3. The dielectric according to claim 1, wherein conductor film pieces that are respectively connected to the inner conductors are formed on the other of the two end faces of the dielectric block. filter.
形成されており、前記誘電体ブロックの２つの端面のう
ちの他方には、隣接貫通孔の開口間に前記外導体と接続
せる段間結合用導体膜片を形成してなることを特徴とす
る、請求項１に記載の誘電体フィルタ。4. The dielectric block is formed with a plurality of the through holes, and the other end of the two end faces of the dielectric block has an interstage connected to the outer conductor between the openings of the adjacent through holes. The dielectric filter according to claim 1, wherein a coupling conductive film piece is formed.
孔を複数の場合には互いに平行に形成し、各貫通孔の内
面に導体膜を形成して内導体とし、前記誘電体ブロック
の内導体と交わらない側面に導体膜を形成して外導体と
し、前記貫通孔が開口せる前記誘電体ブロックの２つの
端面のうちの一方に導体膜を形成して前記内導体と前記
外導体とを短絡させ、前記誘電体ブロックを複数並列配
置して結合させ、両端の内導体のそれぞれに対応して前
記誘電体ブロックの側面の少なくとも１つに少なくとも
１つの切欠部を形成し、該切欠部の内面に前記外導体と
絶縁された導体膜を形成して入出力用電極としてなるこ
とを特徴とする、誘電体フィルタ。5. In a case where a plurality of through holes are formed in the dielectric block in parallel to each other when a plurality of through holes are formed, an inner conductor is formed by forming a conductor film on the inner surface of each through hole, and the inner conductor of the dielectric block is formed. An outer conductor is formed by forming a conductor film on the side surfaces that do not intersect, and a conductor film is formed on one of the two end faces of the dielectric block in which the through holes are opened to short-circuit the inner conductor and the outer conductor. , A plurality of the dielectric blocks are arranged in parallel and coupled to each other, at least one notch is formed on at least one of the side surfaces of the dielectric block corresponding to each of the inner conductors at both ends, and the inner surface of the notch is formed. A dielectric filter, wherein a conductor film insulated from the outer conductor is formed to serve as an input / output electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10977493A JPH06303007A (en) | 1993-04-14 | 1993-04-14 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10977493A JPH06303007A (en) | 1993-04-14 | 1993-04-14 | Dielectric filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06303007A true JPH06303007A (en) | 1994-10-28 |
Family
ID=14518893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10977493A Pending JPH06303007A (en) | 1993-04-14 | 1993-04-14 | Dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06303007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5783980A (en) * | 1996-06-20 | 1998-07-21 | Motorola Inc. | Ceramic filter with notch configuration |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60114004A (en) * | 1983-11-25 | 1985-06-20 | Murata Mfg Co Ltd | Dielectric coaxial resonator |
| JPS6243904A (en) * | 1985-08-22 | 1987-02-25 | Murata Mfg Co Ltd | Dielectric resonator |
| JPH04167702A (en) * | 1990-10-31 | 1992-06-15 | Ube Ind Ltd | Coupling structure for dielectric filter |
-
1993
- 1993-04-14 JP JP10977493A patent/JPH06303007A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60114004A (en) * | 1983-11-25 | 1985-06-20 | Murata Mfg Co Ltd | Dielectric coaxial resonator |
| JPS6243904A (en) * | 1985-08-22 | 1987-02-25 | Murata Mfg Co Ltd | Dielectric resonator |
| JPH04167702A (en) * | 1990-10-31 | 1992-06-15 | Ube Ind Ltd | Coupling structure for dielectric filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5783980A (en) * | 1996-06-20 | 1998-07-21 | Motorola Inc. | Ceramic filter with notch configuration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4800347A (en) | Dielectric filter | |
| KR100253679B1 (en) | Dielectric filter | |
| JPH0255402A (en) | dielectric filter | |
| JPH06303007A (en) | Dielectric filter | |
| JPS63283201A (en) | Integrally molded type high frequency filter | |
| US5691674A (en) | Dielectric resonator apparatus comprising at least three quarter-wavelength dielectric coaxial resonators and having capacitance coupling electrodes | |
| JP2581915Y2 (en) | Dielectric filter | |
| JPS61192101A (en) | Filter | |
| JP2661007B2 (en) | Dielectric filter and pass band adjustment method thereof | |
| JP3425703B2 (en) | Dielectric resonator | |
| JPH07162212A (en) | Surface mount type dielectric filter | |
| JPS63174402A (en) | Dielectric filter device | |
| JPH06112704A (en) | Dielectric filter | |
| JPH06125204A (en) | Dielectric filter | |
| US6034579A (en) | Dielectric filter of the band elimination type | |
| JPH075682Y2 (en) | Dielectric device with terminal | |
| JPH0633686Y2 (en) | Coupling structure of dielectric resonator | |
| JPH0823210A (en) | Dielectric filter and its characteristic adjustment method | |
| JPH0716122B2 (en) | Dielectric filter | |
| JP3469476B2 (en) | Dielectric filter | |
| JPH07221506A (en) | Dielectric coaxial resonator and dielectric filter | |
| JPH0832308A (en) | Dielectric filter and its characteristic adjustment method | |
| JPH07221517A (en) | Dielectric coaxial resonator | |
| JPH0756921B2 (en) | Dielectric filter | |
| JPH077305A (en) | Dielectric filter and mounting method thereof |