JPH03208401A - Manufacture of filter - Google Patents

Manufacture of filter

Info

Publication number
JPH03208401A
JPH03208401A JP374090A JP374090A JPH03208401A JP H03208401 A JPH03208401 A JP H03208401A JP 374090 A JP374090 A JP 374090A JP 374090 A JP374090 A JP 374090A JP H03208401 A JPH03208401 A JP H03208401A
Authority
JP
Japan
Prior art keywords
coaxial resonator
dielectric coaxial
land
capacitance
capacitor
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
Application number
JP374090A
Other languages
Japanese (ja)
Inventor
Yohei Ishikawa
容平 石川
Jun Hattori
準 服部
Hiroyuki Nakaji
博行 中路
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP374090A priority Critical patent/JPH03208401A/en
Publication of JPH03208401A publication Critical patent/JPH03208401A/en
Pending legal-status Critical Current

Links

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To facilitate the adjustment with high precision by cutting off a land on a strip line board so as to vary the capacitance thereby adjusting the resonance frequency of a dielectric coaxial resonator. CONSTITUTION:An input/output terminal TM of a dielectric coaxial resonator RT is soldered to a land LD from the outside of a strip line board SB. Thus, a capacitor C2 is added in parallel with the said dielectric coaxial resonator RT. That is, the dielectric coaxial resonator RT has a resonance frequency by the parallel resonance circuit comprising a capacitor C3 and an inductor L in terms of the circuit and the resonance frequency is changed in response to the added capacitor C2, and the resonance frequency is revised in response to the added capacitor C2. Then the land LD is cut off, e.g. as shown in broken lines in figure to vary the capacitance C2, the resonance frequency of the dielectric coaxial resonator RT is adjusted in response to the change in the capacitance C2 to adjust the filter characteristic of the active filter.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、誘電体同軸共振器を有するフィルタの製造方
法に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a filter having a dielectric coaxial resonator.

(従来の技術) 誘電体同軸共振器を有するフィルタの製造にあたっては
、共振周波数を調整する必要がある。
(Prior Art) In manufacturing a filter having a dielectric coaxial resonator, it is necessary to adjust the resonant frequency.

従来、この共振周波数の調整としては、誘電体同軸共振
器の開放側端面を削り取ってその共振器長を変えること
で共振周波数を調整する方法とか、その開放側端面に共
振周波数調整用電極を形成したうえで、その電極を削り
取って共振周波数の調整を行う方法とかがある。
Conventionally, this resonant frequency has been adjusted by cutting off the open side end face of a dielectric coaxial resonator and changing the resonator length, or by forming an electrode for resonant frequency adjustment on the open side end face. Then, there is a method to adjust the resonant frequency by scraping off the electrode.

(発明が解決しようとする課題) いずれの方法も、手間がかかる割にはその精密な調整が
困難であることが知られている。
(Problems to be Solved by the Invention) It is known that both methods are time-consuming and difficult to precisely adjust.

したがって、本発明においては、手間のかからない割に
は精密な調整が可能にすることを目的としている。
Therefore, it is an object of the present invention to enable precise adjustment without requiring much effort.

(課題を解決するための手段) このような目的を達成するために、本発明のフイルタの
製造方法においては、ストリップライン基板上に搭載さ
れているフィルタ素子に接続されるようにかつ該ストリ
ップライン基板上の接地電極との間で容量を持つように
ランドを、該ストリップライン基板に形成し、次いで、
ストリップライン基板外において前記フィルタ素子と共
にフィルタを構成する誘電体同軸共振器を、前記ランド
に接続することにより、該誘電体同軸共振器に並列に前
記容量を付加し、次いで、ランドを削り取っていくこと
により前記容量を変えて前記誘電体同軸共振器の共振周
波数を調整することを特徴としている。
(Means for Solving the Problems) In order to achieve such an object, in the method for manufacturing a filter of the present invention, the stripline is connected to a filter element mounted on a stripline substrate and A land is formed on the stripline substrate so as to have a capacitance between it and a ground electrode on the substrate, and then,
By connecting a dielectric coaxial resonator that constitutes a filter together with the filter element to the land outside the stripline board, the capacitance is added in parallel to the dielectric coaxial resonator, and then the land is removed. Accordingly, the resonant frequency of the dielectric coaxial resonator is adjusted by changing the capacitance.

(作用) ストリップライン基板上のランドを削り取って容量を変
えることにより誘電体同軸共振器の共振周波数を調整す
ることができる。
(Function) The resonant frequency of the dielectric coaxial resonator can be adjusted by removing the lands on the stripline board and changing the capacitance.

(実施例) 以下、本発明の実施例を図面を参照して詳細に説明する
(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

本実施例が適用されるアクティブフィルタは、第1図に
示すように、入力端子INと出力端子OUTとの間の信
号ラインQと接地部gとの間に、コンデンサCIおよび
誘電体同軸共振器RTが接続され、コンデンサC1と誘
電体同軸共振器RTとの接続部に増幅帰還回路AMPが
接続されて構成されている。増幅帰還回路AMPは、よ
く知られているように、トランジスタ等の能動素子を含
むしので該アクティブフィルタにおける挿入損失を打ち
消して、そのフィルタの尖鋭度Qを高めるためのもので
ある。
As shown in FIG. 1, the active filter to which this embodiment is applied has a capacitor CI and a dielectric coaxial resonator connected between the signal line Q between the input terminal IN and the output terminal OUT and the ground section g. RT is connected thereto, and an amplification feedback circuit AMP is connected to a connecting portion between the capacitor C1 and the dielectric coaxial resonator RT. As is well known, the amplification feedback circuit AMP includes active elements such as transistors and is intended to cancel the insertion loss in the active filter and increase the sharpness Q of the filter.

以下、回路的には第1図のように構成されるアクティブ
フィルタの製造方法について第2図および第3図を説明
する。
Hereinafter, a method for manufacturing an active filter having a circuit structure as shown in FIG. 1 will be described with reference to FIGS. 2 and 3.

まず、ストリップライン基板SBを用意する。First, a stripline board SB is prepared.

このストリップライン基板SBの表面には所要の配線パ
ターンHPが形成されている。この表面側の配線パター
ンHPは主に第1図の各回路素子を相互接続するための
ものである。また、この基板SBの裏面側には全面に接
地電極EEが形成されている。そして、このストリップ
ライン基板SBにさらに、本発明の特徴とするランドL
Dを表面側配線パターンHPの端部に形成する。このラ
ンドLDは、接地電極EEとの間で第1図の破線で示さ
れた容量C2を持つようになっている。
A required wiring pattern HP is formed on the surface of this stripline board SB. The wiring pattern HP on the front side is mainly for interconnecting each circuit element shown in FIG. Further, a ground electrode EE is formed on the entire surface of the back side of the substrate SB. Further, on this strip line board SB, a land L, which is a feature of the present invention, is added.
D is formed at the end of the front side wiring pattern HP. This land LD has a capacitance C2 between it and the ground electrode EE as shown by the broken line in FIG.

次いで、コンデンサCIとか増幅帰還回路AMPとかの
アクティブフィルタ用の複数のフィルタ素子を、表面側
配線パターンHPに対してストリップライン基板SB上
に適宜に搭載するとともに、表面側配線パターンHPに
半田付けする。
Next, a plurality of filter elements for active filters such as the capacitor CI and the amplification feedback circuit AMP are appropriately mounted on the strip line board SB with respect to the front side wiring pattern HP, and are soldered to the front side wiring pattern HP. .

そして、誘電体同軸共振器RTの入出力端子TMをスト
リップライン基板SB外からランドLDに半田付けする
。このようにして、誘電体同軸共振器RTをランドLD
に接続することにより、該誘電体同軸共振器には並列に
容量C2が付加されたことになる。
Then, the input/output terminal TM of the dielectric coaxial resonator RT is soldered to the land LD from outside the strip line board SB. In this way, the dielectric coaxial resonator RT is connected to the land LD.
By connecting to the dielectric coaxial resonator, a capacitor C2 is added in parallel to the dielectric coaxial resonator.

すなわち、誘電体同軸共振器RTは回路的には容量C3
とインダクタンスLとの並列共振回路による共振周波数
を有しているが、付加された容量02分に応じてその共
振周波数が変更されることになる。
In other words, the dielectric coaxial resonator RT has a capacitance C3 in circuit terms.
It has a resonant frequency due to the parallel resonant circuit of the inductance L and the inductance L, but the resonant frequency is changed according to the added capacitance 02.

次いで、ランドLDを例えば第會図の破線のように削り
取っていくことにより前記容量C2が変わっていくこと
になるが、この容量C2の変更に応じて誘電体同軸共振
器RTの共振周波数を調整していってアクティブフィル
タのフィルタ特性を調整して、該アクティブフィルタの
製造が終了する。
Next, the capacitance C2 is changed by cutting off the land LD as indicated by the broken line in the diagram, and the resonant frequency of the dielectric coaxial resonator RT is adjusted according to this change in the capacitance C2. Then, the filter characteristics of the active filter are adjusted, and the manufacture of the active filter is completed.

(発明の効果) 以上説明したことから明らかなように本発明によれば、
ストリップライン基板上のランドを削り取って容量を変
えることにより誘電体同軸共振器の共振周波数を調整す
るようにしたから、従来のような誘電体同軸共振器の開
放側端面削り取り作業による共振周波数調整作業とか、
あるいはその開放側端面に電極を形成し該電極の削り取
り作業による共振周波数調整作業にくらべて容易な調整
作業となるうえ、その調整も精密に行うことができる。
(Effects of the Invention) As is clear from the above explanation, according to the present invention,
Since the resonant frequency of the dielectric coaxial resonator is adjusted by scraping off the land on the stripline board and changing the capacitance, it is no longer necessary to adjust the resonant frequency by scraping off the open end face of the dielectric coaxial resonator as in the past. And,
Alternatively, the adjustment work is easier than resonant frequency adjustment work by forming an electrode on the open end face and scraping off the electrode, and the adjustment can also be performed precisely.

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

第1図は本発明の実施例に係るアクティブフィルタの斜
視図、第2図は第1図の要部の拡大平面図、第3図はア
クティブフィルタの電気的等価回路図である。 SB・・・ストリップライン基板、CI 、AMP・・
フィルタ素子、RT・・・誘電体同軸共振器、HP・・
・配線パターン、EE・・・接地電極、LD・・・ラン
ド。
FIG. 1 is a perspective view of an active filter according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of the main part of FIG. 1, and FIG. 3 is an electrical equivalent circuit diagram of the active filter. SB...Strip line board, CI, AMP...
Filter element, RT...dielectric coaxial resonator, HP...
・Wiring pattern, EE...ground electrode, LD...land.

Claims (1)

【特許請求の範囲】[Claims] (1)ストリップライン基板(SB)上に搭載されてい
るフィルタ素子(C1,AMP)に接続されるように、
かつ該ストリップライン基板(SB)上の接地電極(E
E)との間で容量(C2)を持つようにランド(LD)
を、該ストリップライン基板(SB)に形成し、 次いで、ストリップライン基板(SB)外において前記
フィルタ素子(C1,AMP)と共にフィルタを構成す
る誘電体同軸共振器(RT)を、前記ランド(LD)に
接続することにより、該誘電体同軸共振器(RT)に並
列に前記容量(C2)を付加し、次いで、ランド(LD
)を削り取っていくことにより前記容量(C2)を変え
て前記誘電体同軸共振器(RT)の共振周波数を調整す
ることを特徴とするフィルタの製造方法。
(1) To be connected to the filter element (C1, AMP) mounted on the stripline board (SB),
and the ground electrode (E) on the stripline board (SB).
Land (LD) so as to have a capacitance (C2) between
is formed on the stripline substrate (SB), and then a dielectric coaxial resonator (RT) constituting a filter together with the filter element (C1, AMP) outside the stripline substrate (SB) is attached to the land (LD). ), the capacitor (C2) is added in parallel to the dielectric coaxial resonator (RT), and then the land (LD
), thereby changing the capacitance (C2) and adjusting the resonant frequency of the dielectric coaxial resonator (RT).
JP374090A 1990-01-10 1990-01-10 Manufacture of filter Pending JPH03208401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP374090A JPH03208401A (en) 1990-01-10 1990-01-10 Manufacture of filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP374090A JPH03208401A (en) 1990-01-10 1990-01-10 Manufacture of filter

Publications (1)

Publication Number Publication Date
JPH03208401A true JPH03208401A (en) 1991-09-11

Family

ID=11565615

Family Applications (1)

Application Number Title Priority Date Filing Date
JP374090A Pending JPH03208401A (en) 1990-01-10 1990-01-10 Manufacture of filter

Country Status (1)

Country Link
JP (1) JPH03208401A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351023A (en) * 1992-04-21 1994-09-27 Lk-Products Oy Helix resonator
EP0774798A3 (en) * 1995-11-16 1997-06-11 Ngk Spark Plug Co

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351023A (en) * 1992-04-21 1994-09-27 Lk-Products Oy Helix resonator
EP0774798A3 (en) * 1995-11-16 1997-06-11 Ngk Spark Plug Co
US5841332A (en) * 1995-11-16 1998-11-24 Ngk Spark Plug Co., Ltd. Dielectric filter and method of adjusting central frequency of the same
EP1119070A1 (en) * 1995-11-16 2001-07-25 NGK Spark Plug Co. Ltd. Dielectric filter and method of adjusting central frequency of the same

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