JPS553281A - Elastic surface wave filter - Google Patents
Elastic surface wave filterInfo
- Publication number
- JPS553281A JPS553281A JP7606078A JP7606078A JPS553281A JP S553281 A JPS553281 A JP S553281A JP 7606078 A JP7606078 A JP 7606078A JP 7606078 A JP7606078 A JP 7606078A JP S553281 A JPS553281 A JP S553281A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- difference
- partial electrodes
- logarithms
- thinned
- 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
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
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers
-
- 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
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14597—Matching SAW transducers to external electrical circuits
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
PURPOSE:To obtain the necessary amplitude frequency characteristics by securing the maximum logarithm difference of 1 for the partial electrodes at both ends and then making the difference identical or larger toward the opposing transducers from the end part of the substrate with the logarithm difference of 1/2 secured between the partial electrodes. CONSTITUTION:The comb-line electrode of the transducer is divded, for example, into partial electrodes 7, 8 and 9 with the serial connection given between them. Here the logarithms of electrodes 7,8 and 9 are set to 4, 4, 5, 4 and 5 each, and the difference of the logarithms is less than 1 for the partial electrodes at the both ends to be identical or larger toward the opposing transducers from the end part of the substrate. At the same time, the comb-lines are thinned so that the difference of the logarithms may be under 1/2 between the adjacent partial electrodes, thus obtaining the weighting electrodes. As a result, the impedance is increased between the thinned and weighted electrodes with the lowered capacity plus the matching to the external connection circuit secured, thus obtaining the desired amplitude frequency characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7606078A JPS553281A (en) | 1978-06-22 | 1978-06-22 | Elastic surface wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7606078A JPS553281A (en) | 1978-06-22 | 1978-06-22 | Elastic surface wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS553281A true JPS553281A (en) | 1980-01-11 |
Family
ID=13594220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7606078A Pending JPS553281A (en) | 1978-06-22 | 1978-06-22 | Elastic surface wave filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS553281A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734624U (en) * | 1980-07-29 | 1982-02-23 | ||
| FR2646300A1 (en) * | 1989-04-25 | 1990-10-26 | Japan Radio Co Ltd | FILTER FOR ELASTIC SURFACE WAVE |
| JPH02271705A (en) * | 1989-04-12 | 1990-11-06 | Nec Corp | Surface acoustic wave transducer |
| JPH09331233A (en) * | 1996-06-12 | 1997-12-22 | Toyo Commun Equip Co Ltd | Surface acoustic wave filter |
| US7034435B2 (en) * | 2001-06-22 | 2006-04-25 | Oki Electric Industry Co., Ltd. | Saw device |
| US20100052819A1 (en) * | 2008-09-02 | 2010-03-04 | Fujitsu Media Devices Limited | Acoustic wave device and system |
| WO2019189634A1 (en) * | 2018-03-29 | 2019-10-03 | 株式会社村田製作所 | Elastic wave resonator and multiplexer |
-
1978
- 1978-06-22 JP JP7606078A patent/JPS553281A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734624U (en) * | 1980-07-29 | 1982-02-23 | ||
| JPH02271705A (en) * | 1989-04-12 | 1990-11-06 | Nec Corp | Surface acoustic wave transducer |
| FR2646300A1 (en) * | 1989-04-25 | 1990-10-26 | Japan Radio Co Ltd | FILTER FOR ELASTIC SURFACE WAVE |
| US5175519A (en) * | 1989-04-25 | 1992-12-29 | Nihon Musen Kabushiki Kaisha | Surface elastic wave filter having finger omitted transducers to eliminate side lobes |
| JPH09331233A (en) * | 1996-06-12 | 1997-12-22 | Toyo Commun Equip Co Ltd | Surface acoustic wave filter |
| US7034435B2 (en) * | 2001-06-22 | 2006-04-25 | Oki Electric Industry Co., Ltd. | Saw device |
| US20100052819A1 (en) * | 2008-09-02 | 2010-03-04 | Fujitsu Media Devices Limited | Acoustic wave device and system |
| US8289106B2 (en) * | 2008-09-02 | 2012-10-16 | Taiyo Yuden Co., Ltd. | Acoustic wave device and system |
| WO2019189634A1 (en) * | 2018-03-29 | 2019-10-03 | 株式会社村田製作所 | Elastic wave resonator and multiplexer |
| US11863158B2 (en) | 2018-03-29 | 2024-01-02 | Murata Manufacturing Co., Ltd. | Acoustic wave resonator and multiplexer |
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