GB1360235A - Acoustic surface wave devices - Google Patents
Acoustic surface wave devicesInfo
- Publication number
- GB1360235A GB1360235A GB973671A GB973671A GB1360235A GB 1360235 A GB1360235 A GB 1360235A GB 973671 A GB973671 A GB 973671A GB 973671 A GB973671 A GB 973671A GB 1360235 A GB1360235 A GB 1360235A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducer
- finger
- surface wave
- acoustic surface
- fingers
- 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.)
- Expired
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
- H03H9/14517—Means for weighting
- H03H9/1452—Means for weighting by finger overlap length, apodisation
-
- 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
- H03H9/02881—Means for compensation or elimination of undesirable effects of diffraction of wave beam
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
1360235 Acoustic surface wave devices MARCONI CO Ltd 26 Oct 1971 [17 April 1971] 9736/71 Heading H3U To avoid acoustic surface wave diffraction effects produced by a known form at interdigital transducer, Fig. 1 (not shown) whose fingers have a weighted overlap region, a plurality of shorter fingers positioned in the non- overlap region, each aligned with an overlapping finger and separated therefrom by a gap 7 are provided. The electrical and mechanical impedance over the entire transducer area is thus made uniform. Each additional finger is connected to bus electrodes 1, 2, or alternatively each alternate, or third such finger may be electrically disconnected at its base. Bridges 8, 9, may connect each additional finger adjacent gaps 7 with the neighbouring overlapping fingers. A piezoelectric substrate supporting the transducer may be formed of lithium metaniobate, or quartz. Suitable transducer metals are Al, or Au.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB973671A GB1360235A (en) | 1971-04-17 | 1971-04-17 | Acoustic surface wave devices |
FR7213445A FR2133821B1 (en) | 1971-04-17 | 1972-04-17 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB973671A GB1360235A (en) | 1971-04-17 | 1971-04-17 | Acoustic surface wave devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1360235A true GB1360235A (en) | 1974-07-17 |
Family
ID=9877785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB973671A Expired GB1360235A (en) | 1971-04-17 | 1971-04-17 | Acoustic surface wave devices |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2133821B1 (en) |
GB (1) | GB1360235A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3838383A1 (en) * | 1987-11-13 | 1989-06-01 | Hitachi Ltd | DEVICE FOR ACOUSTIC SURFACE WAVES WITH OVERLAP-WEIGHTED CONVERTER PROVIDED WITH A GROUP OF ELECTRODES WITH IRREGULAR SPACING |
EP0935341A2 (en) * | 1998-02-06 | 1999-08-11 | Murata Manufacturing Co., Ltd. | Surface acoustic wave device |
DE102010055628A1 (en) | 2010-12-22 | 2012-06-28 | Epcos Ag | Electro-acoustic resonator |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1512686A (en) * | 1975-08-18 | 1978-06-01 | Mullard Ltd | Acoustic surface wave devices |
-
1971
- 1971-04-17 GB GB973671A patent/GB1360235A/en not_active Expired
-
1972
- 1972-04-17 FR FR7213445A patent/FR2133821B1/fr not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3838383A1 (en) * | 1987-11-13 | 1989-06-01 | Hitachi Ltd | DEVICE FOR ACOUSTIC SURFACE WAVES WITH OVERLAP-WEIGHTED CONVERTER PROVIDED WITH A GROUP OF ELECTRODES WITH IRREGULAR SPACING |
US4918349A (en) * | 1987-11-13 | 1990-04-17 | Hitachi, Ltd. | Surface acoustic wave device having apodized transducer provided with irregular pitch electrode group |
EP0935341A2 (en) * | 1998-02-06 | 1999-08-11 | Murata Manufacturing Co., Ltd. | Surface acoustic wave device |
EP0935341A3 (en) * | 1998-02-06 | 2000-12-27 | Murata Manufacturing Co., Ltd. | Surface acoustic wave device |
DE102010055628A1 (en) | 2010-12-22 | 2012-06-28 | Epcos Ag | Electro-acoustic resonator |
JP2014502809A (en) * | 2010-12-22 | 2014-02-03 | エプコス アクチエンゲゼルシャフト | Electroacoustic resonator |
DE102010055628B4 (en) | 2010-12-22 | 2018-09-06 | Snaptrack, Inc. | Electro-acoustic resonator |
Also Published As
Publication number | Publication date |
---|---|
FR2133821A1 (en) | 1972-12-01 |
FR2133821B1 (en) | 1979-01-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |