JPS5934712A - Surface acoustic wave device - Google Patents
Surface acoustic wave deviceInfo
- Publication number
- JPS5934712A JPS5934712A JP14566382A JP14566382A JPS5934712A JP S5934712 A JPS5934712 A JP S5934712A JP 14566382 A JP14566382 A JP 14566382A JP 14566382 A JP14566382 A JP 14566382A JP S5934712 A JPS5934712 A JP S5934712A
- Authority
- JP
- Japan
- Prior art keywords
- surface acoustic
- converter
- acoustic wave
- electrode
- wave device
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
Abstract
Description
【発明の詳細な説明】
本発明は対向する弾性表面波変換器の間に接地電極を有
する弾性表面波装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface acoustic wave device having a ground electrode between opposing surface acoustic wave transducers.
従来から弾性表面波変換器間の電磁的静電的結合を抑圧
するために第１図に示すように、変換器１および２間に
接地電極３を配置した栴造の弾性表面波装置が知られて
（・る。このような表面波装置にお（・て装置の小型化
および遅延歪％性、振幅特性の改善を行う場合、変換器
１，２間の間隔をできる限り短くする心太がある。しか
し、変換器間の間隔を短くすることによって隣接接地市
、極３と変換器１の電極指４間に電界が発生し、これに
より不要弾性表面波が発生する。この結果、この不要弾
性表面波と所望の弾性表面波が受信側変換器２で結合し
、両弾性表面波の伝搬距離の差（！□−！、）によって
通過帯域内および帯域外に周期Δｆ＝Ｖ、（１！、、ｎ
−看、）の大きなりプルか発生し、周波数特性の劣化な
もたらして（・る。Conventionally, a surface acoustic wave device by SEIZO has been known in which a ground electrode 3 is arranged between transducers 1 and 2, as shown in FIG. 1, in order to suppress electromagnetic and electrostatic coupling between surface acoustic wave transducers. When miniaturizing the device and improving delay distortion and amplitude characteristics in such a surface wave device, it is necessary to shorten the distance between the transducers 1 and 2 as much as possible. However, by shortening the distance between the transducers, an electric field is generated between the adjacent ground pole 3 and the electrode finger 4 of the transducer 1, which generates unnecessary surface acoustic waves.As a result, this unnecessary The surface acoustic wave and the desired surface acoustic wave are combined in the receiving transducer 2, and due to the difference in propagation distance (!□-!,) of both surface acoustic waves, a period Δf=V, (1 !,,n
- A large pull or pull occurs in the frequency response, resulting in deterioration of the frequency characteristics.
本発明の目的は、弾性表面波変換器の間に配置されたシ
ールド電極と変換器の電極指との間で発生す不不要弾性
表面波を抑圧し、小型で良好な周波数特性を有する弾性
表面波装置を折供することにある。An object of the present invention is to suppress unnecessary surface acoustic waves generated between a shield electrode placed between a surface acoustic wave transducer and an electrode finger of the transducer, and to provide an elastic surface having a small size and good frequency characteristics. The purpose is to provide wave equipment.
次に図面を参照して本発明の詳細な説明する。Next, the present invention will be described in detail with reference to the drawings.
第２図は本発明の第１の実施例を示す平面図である。図
にお（・て、本発明の表面波装置は、励振側変換器５と
、受信側変換器６と、これらの間に配置された接地電極
７と、励振側変換器５と接地電極７との間に配置され変
換器５と同一周期を有し電気的に開放された２本の電極
８とから構成されて（・る。FIG. 2 is a plan view showing the first embodiment of the present invention. In the figure, the surface acoustic wave device of the present invention includes an excitation side converter 5, a reception side converter 6, a ground electrode 7 disposed between these, and an excitation side converter 5 and a ground electrode 7. It consists of two electrically open electrodes 8 which are arranged between the converter 5 and have the same period as the converter 5.
第３図は、受信側変換器９および１０と、励振側変換器
１１と、これらの間に配置された接地電極１２および１
３と、変換器９および１０と接地電極１２および１３と
の間に配置された２本の電気的に開放された電極１４と
から構成される本発明の第２の実施例を示ず。FIG. 3 shows receiving transducers 9 and 10, excitation transducer 11, and ground electrodes 12 and 1 disposed between them.
3 and two electrically open electrodes 14 arranged between the transducers 9 and 10 and the ground electrodes 12 and 13 are not shown.
第４図は、重み付けされた励振側変換器１５ど、受信側
変換器１６と、マルチストリップカプラ（Ｍ曹Ｓ・Ｃ）
１７と、各変換器１５および１６とＭＳＣ１７との間に
設けられた接地電極１８および１９と、各変換器と接地
市、極の間に設けられた電気的に開放された２本の電極
２０とから構成されて（・る。FIG. 4 shows a weighted excitation side converter 15, a receiving side converter 16, and a multi-strip coupler (MCo S/C).
17, ground electrodes 18 and 19 provided between each converter 15 and 16 and the MSC 17, and two electrically open electrodes 20 provided between each converter and the ground electrode. It is composed of (・ru.
第５図は第１図に示す従来の弾性表面波装置の周波数特
性で、帯域内リプル４ ｃｌＢ、帯域外減衰量２０ｄｌ
ｌである。Figure 5 shows the frequency characteristics of the conventional surface acoustic wave device shown in Figure 1, with in-band ripple of 4 clB and out-of-band attenuation of 20 dl.
It is l.
第６図は本発明による弾性表面波装置の周波数特性で帯
域内リプル２ｄＢ以下、帯域外減衰川２９佃以上に改善
されて（・る。FIG. 6 shows the frequency characteristics of the surface acoustic wave device according to the present invention, which has an in-band ripple of less than 2 dB and an out-of-band attenuation of more than 29 dB.
以上のように本発明により周波数特性を敗戦した良好な
特性を有する弾性表面波装置が得られる。As described above, according to the present invention, a surface acoustic wave device having good frequency characteristics can be obtained.
第１図は従来の弾性表面波装置”を示す平面図、第２図
〜４図は本発明の実施例を示す平面図、第５図および第
６図は従来の弾性表面披裂ｊｈ゛および本発明による弾
性表面波装置の周波数特性を示す図である。
図にお（・てFIG. 1 is a plan view showing a conventional surface acoustic wave device, FIGS. 2 to 4 are plan views showing an embodiment of the present invention, and FIGS. It is a diagram showing the frequency characteristics of the surface acoustic wave device according to the invention.
Claims (1)
前記変換器の間に接地電極を有し前記変換器と前記接地
電極の間に電気的に開放された少なくとも１本の電極指
な設けたこと馨特徴とする弾性表面波装置。at least two surface acoustic wave transducers facing each other;
A surface acoustic wave device characterized in that a ground electrode is provided between the transducer, and at least one electrode finger is electrically open between the transducer and the ground electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14566382A JPH0244168B2 (en) | 1982-08-23 | 1982-08-23 | DANSEIHYOMENHASOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14566382A JPH0244168B2 (en) | 1982-08-23 | 1982-08-23 | DANSEIHYOMENHASOCHI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5934712A true JPS5934712A (en) | 1984-02-25 |
| JPH0244168B2 JPH0244168B2 (en) | 1990-10-03 |
Family
ID=15390210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14566382A Expired - Lifetime JPH0244168B2 (en) | 1982-08-23 | 1982-08-23 | DANSEIHYOMENHASOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0244168B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6450610A (en) * | 1987-08-20 | 1989-02-27 | Showa Electric Wire & Cable Co | Surface acoustic wave device |
| WO1999046856A1 (en) * | 1998-03-11 | 1999-09-16 | Fujitsu Limited | Surface acoustic wave filter |
| US7271685B2 (en) | 2004-07-15 | 2007-09-18 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter |
-
1982
- 1982-08-23 JP JP14566382A patent/JPH0244168B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6450610A (en) * | 1987-08-20 | 1989-02-27 | Showa Electric Wire & Cable Co | Surface acoustic wave device |
| WO1999046856A1 (en) * | 1998-03-11 | 1999-09-16 | Fujitsu Limited | Surface acoustic wave filter |
| US6577210B1 (en) | 1998-03-11 | 2003-06-10 | Fujitsu Limited | Surface acoustic wave filter having plural propagation paths and a coupler |
| US7271685B2 (en) | 2004-07-15 | 2007-09-18 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0244168B2 (en) | 1990-10-03 |
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