JPH0738526B2 - Coaxial resonator filter - Google Patents
Coaxial resonator filterInfo
- Publication number
- JPH0738526B2 JPH0738526B2 JP60248206A JP24820685A JPH0738526B2 JP H0738526 B2 JPH0738526 B2 JP H0738526B2 JP 60248206 A JP60248206 A JP 60248206A JP 24820685 A JP24820685 A JP 24820685A JP H0738526 B2 JPH0738526 B2 JP H0738526B2
- Authority
- JP
- Japan
- Prior art keywords
- coaxial
- coaxial resonator
- resonator
- filter
- resonators
- 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
【発明の詳細な説明】 産業上の利用分野 本発明は、同軸共振器を用いた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 filter using a coaxial resonator.
従来の技術 従来、同軸誘電体共振器を用いて同軸型フィルタを構成
する場合、同軸誘電体共振器はフィルタ特性を求めるも
のにするため３素子、５素子等共振器を複数個配置し
て、フィルタを構成していた。2. Description of the Related Art Conventionally, in the case of forming a coaxial type filter using a coaxial dielectric resonator, the coaxial dielectric resonator is provided with a plurality of 3-element, 5-element, etc. resonators in order to obtain filter characteristics. It constituted a filter.
そして、これら複数個配置している共振器は、共振周波
数に合わせて、素子の長さを、それぞれ研削機などで研
削加工をして、ケースにハンダ付あるいは導電性接着剤
などで固定していた。Then, the resonators arranged in plural numbers are ground in length by a grinder etc. according to the resonance frequency and fixed to the case with solder or conductive adhesive. It was
第４図に従来例を示す。FIG. 4 shows a conventional example.
第４図で１はケースで、周波数微調整用のチューニング
ネジ2,3,4が設けられ組み立て後周波数調整を行なって
いる。5,6はそれぞれ入出力用コネクタ、7,8,9はそれぞ
れ誘電体でチタン酸塩素磁器あるいはMgTiO3,CaTiO3系
の磁器が用いられている。10,11,12はそれぞれ銀電極で
それぞれ誘電体7,8,9の外周，内周および端面に塗付焼
付なされている。13,14,15はそれぞれ棒状の金属の導体
で、誘電体7,8,9の内周部にハンダで固定されている。1
6は基板であり、アルミナやテフロン等が使用され、基
板16の上面に設けた対向電極17によって結合容量を得る
ように形成されていた。In FIG. 4, reference numeral 1 denotes a case, which is provided with tuning screws 2, 3, and 4 for fine frequency adjustment and adjusts the frequency after assembly. Reference numerals 5 and 6 are input / output connectors, and reference numerals 7, 8 and 9 are dielectrics, and chlorine titanate porcelain or MgTiO 3 or CaTiO 3 based porcelain is used. Reference numerals 10, 11 and 12 are silver electrodes, respectively, which are coated and baked on the outer circumference, inner circumference and end surfaces of the dielectrics 7, 8, 9 respectively. Reference numerals 13, 14 and 15 are rod-shaped metal conductors, which are fixed to the inner peripheral portions of the dielectrics 7, 8 and 9 with solder. 1
Reference numeral 6 denotes a substrate, which is made of alumina, Teflon, or the like, and is formed so as to obtain the coupling capacitance by the counter electrode 17 provided on the upper surface of the substrate 16.
発明が解決しようとする問題点 しかしながら以上のような従来のフィルタは組み合わせ
る同軸共振器の共振周波数をそれぞれ異ならせるために
共振器の長さが、それぞれ違う同軸共振器を有してお
り、ケース１と電極10や12のアースが均一にとれなく挿
入損失，スプリアスなどの特性が悪くなったりしてい
た。Problems to be Solved by the Invention However, the conventional filter as described above has coaxial resonators having different resonator lengths in order to make the resonance frequencies of the coaxial resonators to be combined different from each other. And the grounding of electrodes 10 and 12 was not evenly distributed, and the characteristics such as insertion loss and spurious were deteriorated.
又、共振器の結合に用いる段間容量を得るために、16と
対向電極17を用いた場合など、共振器と基板16との距離
が不均一なることがあり量産性の面から問題があった。Further, in order to obtain the inter-stage capacitance used for coupling the resonator, when the 16 and the counter electrode 17 are used, the distance between the resonator and the substrate 16 may become non-uniform, which causes a problem in terms of mass productivity. It was
本発明はかかる従来の欠点を解消し、共振周波数の調整
を容易に行うことが出来ると共に、量産性のすぐれたフ
ィルタを構成することを目的としたものである。SUMMARY OF THE INVENTION The present invention has as its object to eliminate the above-mentioned conventional drawbacks, to easily adjust the resonance frequency, and to construct a filter having excellent mass productivity.
問題点を解決するための手段 本発明は上記目的を達成するためになされたもので、複
数の同軸共振器の内で少なくとも１つの同軸共振器の短
絡端側の内面端部に面取りを設ける事によって、複数の
同軸共振器の内で少なくとも１つの共振周波数を他の同
軸共振器の共振周波数と異ならせた。Means for Solving the Problems The present invention has been made to achieve the above object, and chamfers are provided on the inner surface end portion of at least one coaxial resonator among a plurality of coaxial resonators on the short-circuit end side. In this way, at least one resonance frequency of the plurality of coaxial resonators is different from the resonance frequencies of the other coaxial resonators.
作用 以上の構成によって、共振器の長さをそろえることが可
能となり、しかも共振周波数を異ならせる事が可能とな
る。更に共振器の角部の箇所を少なくする事ができる。With the above configuration, the resonators can have the same length, and the resonance frequencies can be made different. Further, the number of corners of the resonator can be reduced.
実施例 以下本発明の同軸共振器フィルタの一実施例について説
明する。EXAMPLE An example of the coaxial resonator filter of the present invention will be described below.
第１図は本発明の同軸共振器の断面図であり、第２図は
同実施例に用いる同軸共振器である。第２図で18は筒状
の同軸共振器の誘電体で、酸化チタン系の材料を用い
た。19は、電極で銀ペーストを誘電体18の上に塗布印刷
し、その後800℃の高温で焼付処理し、電極膜を形成し
たものである。20は内導体21と電極19の端面とが接する
所のコーナー部（短絡端側の内面端部）であり、面取り
を行なったものである。ここで、面取りをした部分の半
径を大きくすると誘電体18の見掛けの誘電率が小さくな
っていき、共振周波数もこれに比例して変化するもので
ある。FIG. 1 is a sectional view of the coaxial resonator of the present invention, and FIG. 2 is a coaxial resonator used in the same embodiment. In FIG. 2, reference numeral 18 denotes a dielectric of a cylindrical coaxial resonator, which is made of titanium oxide type material. Reference numeral 19 is an electrode in which a silver paste is applied and printed on the dielectric 18 and then baked at a high temperature of 800 ° C. to form an electrode film. Reference numeral 20 denotes a corner portion where the inner conductor 21 and the end surface of the electrode 19 are in contact (the inner surface end portion on the short-circuit end side), and is chamfered. Here, if the radius of the chamfered portion is increased, the apparent permittivity of the dielectric material 18 decreases, and the resonance frequency also changes in proportion to this.
第３図は同軸共振器の共振周波数を一定にした時、面取
り寸法と共振器の長さの関係をあらわしたものである。
ここでは直径10m/m、内径3.0mmの同軸共振器をサンプル
として用いた。フィルタを構成する場合、共振周波数の
異なるものを組み合わせて行う。ここでは999MHZ,1039M
HZの３段素子のフィルタを構成した場合第３図からも判
するように異なる面取り寸法の共振器を組み合わすこと
により、共振器の長さを等しくすることができる。FIG. 3 shows the relationship between the chamfer size and the length of the resonator when the resonance frequency of the coaxial resonator is constant.
Here, a coaxial resonator having a diameter of 10 m / m and an inner diameter of 3.0 mm was used as a sample. When constructing a filter, filters having different resonance frequencies are combined. Here 999MH Z , 1039M
In the case of constructing a filter of H Z three-stage element, as can be seen from FIG. 3, the lengths of the resonators can be made equal by combining resonators having different chamfered dimensions.
第１図に本発明の同軸共振器フィルタの一実施例を示
す。22はフィルタのケースであり、23,24はそれぞれ入
出力用のコネクタである。25,26,27はそれぞれ共振周波
数の微調整用チューニングネジであり、フィルタの最終
検査の時に調整を行なうものである。28,29,30はそれぞ
れ同軸共振器であり、同軸共振器28および30の下端に面
取り部31,32が形成されている。そして同軸共振器28,2
9,30は共振周波数が大きく異なるものの図から判るよう
に共振器の長さが等しい。よって同軸共振器28,29,30の
底面とケース22との密着性がよく、アースがよくとれ、
高周波数域の特性が良好になる。またケース22との密着
強度が高いため耐振性が高く信頼の高いフィルタを提供
できるものである。FIG. 1 shows an embodiment of the coaxial resonator filter of the present invention. Reference numeral 22 is a filter case, and 23 and 24 are input / output connectors. 25, 26, and 27 are tuning screws for fine adjustment of the resonance frequency, which are adjusted at the final inspection of the filter. Reference numerals 28, 29 and 30 denote coaxial resonators, respectively, and chamfered portions 31 and 32 are formed at the lower ends of the coaxial resonators 28 and 30, respectively. And the coaxial resonator 28,2
Although the resonance frequencies of 9 and 30 differ greatly, the lengths of the resonators are equal, as can be seen from the figure. Therefore, the adhesion between the bottom of the coaxial resonators 28, 29, 30 and the case 22 is good, and the ground is well taken,
Improves the characteristics in the high frequency range. Further, since the adhesion strength with the case 22 is high, a filter having high vibration resistance and high reliability can be provided.
更に、同軸共振器のコーナー部20に面取りを設ける構成
となっているので、同軸共振器の角部の箇所を少なくさ
せる事ができ、誘電体18を作製する際に、角部の欠けな
どの発生を低減させる事ができる。従って各同軸共振器
において誘電体18の角部の欠けなどが原因となる特性の
ばらつきを低減させることができ、ひいては同軸共振器
フィルタの特性を向上させることができる。Furthermore, since the corner portion 20 of the coaxial resonator is chamfered, it is possible to reduce the number of corner portions of the coaxial resonator. Occurrence can be reduced. Therefore, in each coaxial resonator, it is possible to reduce the variation in the characteristics caused by the lack of the corners of the dielectric material 18, and it is possible to improve the characteristics of the coaxial resonator filter.
発明の効果 以上のように本発明は複数の同軸共振器の内で少なくと
も１つの同軸共振器の短絡端側の内面端部に面取りを設
ける事によって、複数の同軸共振器の内で少なくとも１
つの共振周波数を他の同軸共振器の共振周波数と異なら
せているため各同軸共振器のアースをとりやすく、特性
が良くなるとともに組み立てやすくなるものである。EFFECTS OF THE INVENTION As described above, the present invention provides at least one of a plurality of coaxial resonators by chamfering the inner surface end portion of the at least one coaxial resonator on the short-circuit end side.
Since one resonance frequency is different from the resonance frequencies of the other coaxial resonators, it is easy to ground each coaxial resonator, the characteristics are improved, and the assembly is facilitated.
更に、同軸共振器の短絡端側の内面端部に面取りを設け
た事によって、同軸共振器の角部の箇所を少なくさせる
ことができるので、同軸共振器の特性のばらつきを抑
え、ひいては同軸共振器フィルタの特性を向上させる事
ができる。Furthermore, by providing a chamfer on the inner surface end of the coaxial resonator on the short-circuited end side, it is possible to reduce the number of corners of the coaxial resonator, thus suppressing variations in the characteristics of the coaxial resonator, which in turn results in the coaxial resonance. The characteristics of the filter can be improved.
第１図は本発明の同軸共振器フィルタの一実施例を示す
断面図、第２図は同要部断面図、第３図は同軸共振器の
特性図、第４図は従来の同軸共振器フィルタの断面図で
ある。 22……ケース、25,26,27……チューニングネジ、28,29,
30……同軸共振器、31,32……面取り部。FIG. 1 is a sectional view showing an embodiment of the coaxial resonator filter of the present invention, FIG. 2 is a sectional view of the same part, FIG. 3 is a characteristic diagram of the coaxial resonator, and FIG. 4 is a conventional coaxial resonator. It is sectional drawing of a filter. 22 …… Case, 25,26,27 …… Tuning screw, 28,29,
30 …… Coaxial resonator, 31,32 …… Chamfer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 江口 和弘 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 伊藤 慎一郎 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 高山 義彦 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (56)参考文献 特開 昭60−137102（ＪＰ，Ａ) 牧本，山下，「ＶＨＦ帯小形同軸共振器 の一設計法」，（電子通信学会技術研究報 告，ＭＷ79−44，ＰＰ．15−55) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Eguchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Yoshihiko Takayama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-60-137102 (JP, A) Makimoto, Yamashita, "A design of VHF band compact coaxial resonator" Law ", (Technical Report of IEICE, MW79-44, PP.15-55)
Claims (1)
同軸共振器の内で少なくとも１つの同軸共振器の短絡端
側の内面端部に面取りを設ける事によって、前記複数の
同軸共振器の内で少なくとも１つの同軸共振器の共振周
波数と他の同軸共振器の共振周波数を異ならせたことを
特徴とする同軸共振器フィルタ。1. A plurality of coaxial resonators are provided, and a chamfer is provided at an inner surface end portion of at least one of the coaxial resonators on the short-circuit end side of the plurality of coaxial resonators. A coaxial resonator filter, wherein at least one coaxial resonator has a different resonance frequency from other coaxial resonators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60248206A JPH0738526B2 (en) | 1985-11-06 | 1985-11-06 | Coaxial resonator filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60248206A JPH0738526B2 (en) | 1985-11-06 | 1985-11-06 | Coaxial resonator filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62108601A JPS62108601A (en) | 1987-05-19 |
| JPH0738526B2 true JPH0738526B2 (en) | 1995-04-26 |
Family
ID=17174769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60248206A Expired - Fee Related JPH0738526B2 (en) | 1985-11-06 | 1985-11-06 | Coaxial resonator filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738526B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03292001A (en) * | 1990-04-10 | 1991-12-24 | Matsushita Electric Ind Co Ltd | Dielectric filter |
| US5512866A (en) * | 1994-04-29 | 1996-04-30 | Motorola, Inc. | Ceramic duplex filter |
| JPH09219605A (en) * | 1996-02-09 | 1997-08-19 | Ngk Spark Plug Co Ltd | Dielectric filter and resonance frequency adjusting method therefor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60137102A (en) * | 1983-12-26 | 1985-07-20 | Matsushita Electric Ind Co Ltd | Dielectric filter |
-
1985
- 1985-11-06 JP JP60248206A patent/JPH0738526B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 牧本，山下，「ＶＨＦ帯小形同軸共振器の一設計法」，（電子通信学会技術研究報告，ＭＷ７９−４４，ＰＰ．１５−５５） |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62108601A (en) | 1987-05-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |