JPH0410430U - - Google Patents
Info
- Publication number
- JPH0410430U JPH0410430U JP5190690U JP5190690U JPH0410430U JP H0410430 U JPH0410430 U JP H0410430U JP 5190690 U JP5190690 U JP 5190690U JP 5190690 U JP5190690 U JP 5190690U JP H0410430 U JPH0410430 U JP H0410430U
- Authority
- JP
- Japan
- Prior art keywords
- surface acoustic
- interdigital electrode
- acoustic wave
- wave filter
- substrate
- 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
- 238000010897 surface acoustic wave method Methods 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Description
第１図と第２図は本考案の一実施例を説明する
ためのものであり、このうち第１図は弾性表面波
フイルタの構成図、第２図は第１図で示した弾性
表面波フイルタのフイルタ特性をフーリエ交換に
より時間軸上のレスポンス特性として解析してこ
れを表わした説明図、第３図は従来の弾性表面波
フイルタの構成図、第４図は第３図で示した従来
の弾性表面波フイルタのフイルタ特性をフーリエ
交換により時間軸上のレスポンス特性として解析
してこれを表わした説明図である。
２１……圧電性基板、２２……交叉指状電極、
２３……アポダイズ電極、２８……負極ダミー電
極、２９……正極ダミー電極、３２……出力側吸
音部材。
Figures 1 and 2 are for explaining one embodiment of the present invention, of which Figure 1 is a configuration diagram of a surface acoustic wave filter, and Figure 2 is a diagram of the surface acoustic wave filter shown in Figure 1. An explanatory diagram showing the filter characteristics of a filter analyzed as response characteristics on the time axis using Fourier exchange. Figure 3 is a configuration diagram of a conventional surface acoustic wave filter. Figure 4 is a diagram of the conventional surface acoustic wave filter shown in Figure 3. FIG. 2 is an explanatory diagram illustrating the filter characteristics of the surface acoustic wave filter analyzed by Fourier exchange as response characteristics on the time axis. 21... piezoelectric substrate, 22... interdigital electrode,
23... Apodized electrode, 28... Negative dummy electrode, 29... Positive dummy electrode, 32... Output side sound absorbing member.
Claims (1)
力信号に応じて弾性表面波を励振する第１の交叉
指状電極と、この第１の交叉指状電極と対向して
前記基板上に配置され、前記弾性表面波を受信す
る第２の交叉指状電極と、前記基板上の端部に配
置され、前記第１の交叉指状電極で励振される前
記弾性表面波の反射を防止する吸音部材とを備え
た弾性表面波フイルタにおいて、 前記第１の交叉指状電極と対向しない側におけ
る前記第２の交叉指状電極の端面が前記吸音部材
で覆われるようにしたことを特徴とする弾性表面
波フイルタ。 ２ 第２の交叉指状電極の端面は、最大交叉幅の
少なくとも６０パーセント以上の部分が吸音部材
で覆われていることを特徴とする請求項１記載の
弾性表面波フイルタ。 ３ 第２の交叉指状電極はアポダイズ電極である
ことを特徴とする請求項１または２記載の弾性表
面波フイルタ。[Claims for Utility Model Registration] 1. A piezoelectric substrate, a first interdigital electrode disposed on the substrate and exciting a surface acoustic wave according to an input signal, and the first interdigital electrode. a second interdigital electrode disposed on the substrate to face the surface acoustic wave and receiving the surface acoustic wave; and a second interdigital electrode disposed at an end on the substrate and excited by the first interdigital electrode. A surface acoustic wave filter comprising a sound absorbing member that prevents reflection of surface acoustic waves, wherein an end surface of the second interdigital electrode on a side not facing the first interdigital electrode is covered with the sound absorbing member. A surface acoustic wave filter characterized by: 2. The surface acoustic wave filter according to claim 1, wherein at least 60 percent or more of the maximum intersecting width of the end face of the second interdigital electrode is covered with a sound absorbing member. 3. The surface acoustic wave filter according to claim 1 or 2, wherein the second interdigital electrode is an apodized electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5190690U JPH0410430U (en) | 1990-05-18 | 1990-05-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5190690U JPH0410430U (en) | 1990-05-18 | 1990-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0410430U true JPH0410430U (en) | 1992-01-29 |
Family
ID=31571755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5190690U Pending JPH0410430U (en) | 1990-05-18 | 1990-05-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0410430U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5741129A (en) * | 1980-08-13 | 1982-03-08 | Mitsubishi Electric Corp | Electric conduction machining process and its equipment |
| JPS6419291A (en) * | 1987-07-10 | 1989-01-23 | Hitachi Ltd | Heat exchanger |
-
1990
- 1990-05-18 JP JP5190690U patent/JPH0410430U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5741129A (en) * | 1980-08-13 | 1982-03-08 | Mitsubishi Electric Corp | Electric conduction machining process and its equipment |
| JPS6419291A (en) * | 1987-07-10 | 1989-01-23 | Hitachi Ltd | Heat exchanger |
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