JPH059028U - Surface acoustic wave filter - Google Patents

Surface acoustic wave filter

Info

Publication number
JPH059028U
JPH059028U JP5437291U JP5437291U JPH059028U JP H059028 U JPH059028 U JP H059028U JP 5437291 U JP5437291 U JP 5437291U JP 5437291 U JP5437291 U JP 5437291U JP H059028 U JPH059028 U JP H059028U
Authority
JP
Japan
Prior art keywords
single electrode
surface acoustic
electrode type
acoustic wave
electrodes
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
JP5437291U
Other languages
Japanese (ja)
Inventor
栄一 吹春
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP5437291U priority Critical patent/JPH059028U/en
Publication of JPH059028U publication Critical patent/JPH059028U/en
Pending legal-status Critical Current

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  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

(57)【要約】 【目的】シングル電極型励振電極の両側にシングル電極
型グレーティング電極を配置し弾性表面波フィルタの入
出力インピーダンスを調整する。 【構成】入出力端子にそれぞれシングル電極型励振電極
1A,1Bの弾性表面波両伝搬方向にシングル電極型グ
レーティング電極2A〜2Dを配置し、少なくとも2個
のシングル電極型グレーティング電極2B,2Cを入出
力励振電極1A,1Bの間に配置する。さらにシングル
電極型グレーティング電極の対数を調整することによ
り、弾性表面波フィルタの通過帯域内における入出力イ
ンピーダンス特性を外部回路と整合させている。
(57) [Abstract] [Purpose] Single electrode type grating electrodes are arranged on both sides of the single electrode type excitation electrode to adjust the input / output impedance of the surface acoustic wave filter. [Structure] Single electrode type grating electrodes 2A to 2D are arranged in the input / output terminals in both surface acoustic wave propagation directions of single electrode type excitation electrodes 1A and 1B, and at least two single electrode type grating electrodes 2B and 2C are inserted. It is arranged between the output excitation electrodes 1A and 1B. Furthermore, the input / output impedance characteristics in the pass band of the surface acoustic wave filter are matched with the external circuit by adjusting the number of pairs of single electrode type grating electrodes.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は弾性表面波フィルタに関し、特に弾性表面波フィルタの入出力部のイ ンピーダンス整合をとるために改良された弾性表面波フィルタに関する。   The present invention relates to a surface acoustic wave filter, and particularly to an input / output unit of the surface acoustic wave filter. The present invention relates to an improved surface acoustic wave filter for impedance matching.

【0002】[0002]

【従来の技術】[Prior art]

従来の弾性表面波フィルタは、外部回路とのインピーダンス整合を取る場合に 入出力部にコイルやコンデンサで構成された外部整合回路を接続してインピーダ ンス整合をとっていた。   Conventional surface acoustic wave filters are used for impedance matching with external circuits. Connect an external matching circuit consisting of a coil and a capacitor to the input / output unit I was in good agreement.

【0003】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

この従来の弾性表面波フィルタにおける外部整合回路による整合方法では、整 合回路の部品点数が増加し、かつ、大型となるので、価格の増加,組み立て工数 の増加,形状の増大を生じるという欠点があった。   In this conventional surface acoustic wave filter matching method using an external matching circuit, As the number of parts in the integrated circuit increases and the size increases, the price increases and the number of assembly steps increases. However, there is a drawback in that it causes an increase in the shape and shape.

【0004】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

本考案の弾性表面波フィルタは、圧電基板の表面に電極が設けられ、電極指の 構成をシングル電極としたトランスバーサル型の弾性表面波フィルタにおいて、 入力部と出力部とに備えられたシングル電極型励振電極と、このシングル電極型 励振電極から入出力される弾性表面波の両方向への伝搬方向にシングル電極型グ レーティング電極を配置し、入出力シングル電極型励振電極の間に少なくとも2 個のシングル電極型グレーティング電極を有する。   The surface acoustic wave filter of the present invention is provided with electrodes on the surface of the piezoelectric substrate, In a transversal type surface acoustic wave filter with a single electrode configuration, A single electrode type excitation electrode provided in the input section and the output section, and this single electrode type A single-electrode type is applied in both directions of propagation of surface acoustic waves input and output from the excitation electrode. A rating electrode is placed, and at least two are placed between the input and output single electrode type excitation electrodes. It has a single electrode type grating electrode.

【0005】[0005]

【実施例】【Example】

次に本考案について図面を参照して説明する。   Next, the present invention will be described with reference to the drawings.

【0006】 図1は本考案の一実施例を示す弾性表面波フィルタの電極パターンの構成図で ある。図1の実施例は、入力端子3A、出力端子3Bにそれぞれシングル電極型 励振電極1A,1Bを備え、この励振電極1A,1Bの弾性表面波の両伝搬方向 にシングル電極型グレーティング電極2A,2Bおよび2C,2Dを配置してお り、一方のシングル電極型グレーティング電極2B,2Cは入出力シングル電極 型励振電極1A,1Bの間に位置している。他の実施例を図2に示す。シングル 電極型励振電極1A,1Bの両側に配置されたシングル電極型グレーティング電 極2A,2Bおよび2C,2Dは励振電極1A,1Bのグランド側バスバーに接 続されている。[0006]   FIG. 1 is a block diagram of an electrode pattern of a surface acoustic wave filter showing an embodiment of the present invention. is there. In the embodiment of FIG. 1, the input terminal 3A and the output terminal 3B each have a single electrode type. Excitation electrodes 1A and 1B are provided, and both propagation directions of surface acoustic waves of the excitation electrodes 1A and 1B are provided. The single electrode type grating electrodes 2A, 2B and 2C, 2D One of the single electrode type grating electrodes 2B and 2C is an input / output single electrode. It is located between the mold excitation electrodes 1A and 1B. Another embodiment is shown in FIG. single Single electrode type grating electrodes arranged on both sides of the electrode type excitation electrodes 1A and 1B The poles 2A, 2B and 2C, 2D are connected to the ground side bus bar of the excitation electrodes 1A, 1B. Has been continued.

【0007】 次に本実施例の動作を図3(a),(b)の特性図を参照して説明する。シン グル電極型励振電極1A,1Bの両側にシングル電極型グレーティング電極2A 〜2Dを配置した場合、グレーティング電極での弾性表面波の反射によりフィル タの通過帯域内での入出力インピーダンスは高くなる。又、シングル電極型グレ ーティング電極の対数を多,中,少のうち適当に選ぶことにより、図3に示す中 心周波数f0のフィルタの通過帯域内の入出力インピーダンス変動を小さくする ことができる。図3(b)において対数多の特性がf0においてサセプタンス0 となっている。ただし、シングル電極型グレーティング電極の対数はグレーティ ング電極による弾性表面波の反射による伝搬損失が通過帯域内特性に影響を与え ない適度の対数とする。[0007]   Next, the operation of this embodiment will be described with reference to the characteristic diagrams of FIGS. Shin Single electrode type grating electrodes 2A on both sides of the glu electrode type excitation electrodes 1A and 1B If ~ 2D is placed, fill the surface by reflecting surface acoustic waves at the grating electrode. The input / output impedance in the pass band of the inverter becomes high. In addition, single electrode type As shown in Fig. 3, by selecting the appropriate number of pairs of coating electrodes from high, medium and low. Reduce the fluctuation of input / output impedance in the pass band of the filter with the heart frequency f0 be able to. In FIG. 3B, the characteristic of logarithm is that the susceptance is 0 at f0. Has become. However, the number of pairs of single-electrode grating electrodes is Propagation loss due to the reflection of surface acoustic waves by the ring electrode affects the characteristics in the pass band Not a reasonable logarithm.

【0008】[0008]

【考案の効果】[Effect of device]

以上説明したように本考案は、シングル電極型励振電極の弾性表面波両伝搬方 向に、シングル電極型グレーティング電極を配置することにより、フィルタの通 過帯域内でのインピーダンス整合を取ることができるので、従来例のような大き いコイル,コンデンサを使用せず、かつ、部品点数の減少,組み立て工数の減少 ,装置の小型化をはかることができるという効果がある。   As described above, the present invention is based on the dual surface acoustic wave propagation method of a single electrode type excitation electrode. The single electrode type grating electrode is placed in the Since impedance matching can be achieved within the overband, it is as large as the conventional example. Without using a new coil or capacitor, and reducing the number of parts and assembly man-hours The effect is that the device can be downsized.

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

【図1】本考案の一実施例の構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.

【図2】本考案のほかの実施例の構成図である。FIG. 2 is a configuration diagram of another embodiment of the present invention.

【図3】(a),(b)は本実施例のコンダクタンス特
性,サセプタンス特性を示す特性図である。
3A and 3B are characteristic diagrams showing conductance characteristics and susceptance characteristics of this embodiment.

【符号の説明】[Explanation of symbols]

1A,1B シングル電極型励振電極 2A〜2D シングル電極型グレーティング電極 3A 入力端子 3B 出力端子 1A, 1B Single electrode type excitation electrode 2A-2D Single electrode type grating electrode 3A input terminal 3B output terminal

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 圧電基板の表面に電極が設けられ、電極
指の構成をシングル電極としたトランスバーサル型の弾
性表面波フィルタにおいて、入力部と出力部とに備えら
れたシングル電極型励振電極と、このシングル電極型励
振電極から入出力される弾性表面波の両方向への伝搬方
向にシングル電極型グレーティング電極を配置し、入出
力シングル電極型励振電極の間に少なくとも2個のシン
グル電極型グレーティング電極を有することを特徴とす
る弾性表面波フィルタ。
1. A transversal type surface acoustic wave filter having electrodes formed on the surface of a piezoelectric substrate and having electrode fingers as a single electrode, wherein a single electrode type excitation electrode provided at an input section and an output section is provided. , Single electrode type grating electrodes are arranged in both propagation directions of surface acoustic waves input / output from this single electrode type excitation electrode, and at least two single electrode type grating electrodes are arranged between the input / output single electrode type excitation electrodes. A surface acoustic wave filter having:
【請求項2】 前記シングル電極型グレーティング電極
の対数をある対数に調整して入出力部のインピーダンス
整合をとることを特徴とする請求項1記載の弾性表面波
フィルタ。
2. The surface acoustic wave filter according to claim 1, wherein the impedance of the input / output unit is matched by adjusting the number of pairs of the single electrode type grating electrodes to a certain number of pairs.
JP5437291U 1991-07-15 1991-07-15 Surface acoustic wave filter Pending JPH059028U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5437291U JPH059028U (en) 1991-07-15 1991-07-15 Surface acoustic wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5437291U JPH059028U (en) 1991-07-15 1991-07-15 Surface acoustic wave filter

Publications (1)

Publication Number Publication Date
JPH059028U true JPH059028U (en) 1993-02-05

Family

ID=12968844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5437291U Pending JPH059028U (en) 1991-07-15 1991-07-15 Surface acoustic wave filter

Country Status (1)

Country Link
JP (1) JPH059028U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389914U (en) * 1976-12-23 1978-07-22
JPS55148447U (en) * 1979-04-12 1980-10-25

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389914U (en) * 1976-12-23 1978-07-22
JPS55148447U (en) * 1979-04-12 1980-10-25
JPS5832700Y2 (en) * 1979-04-12 1983-07-20 善伸 山下 chair

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