GB1360235A - Acoustic surface wave devices - Google Patents

Acoustic surface wave devices

Info

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
Application number
GB973671A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB973671A priority Critical patent/GB1360235A/en
Priority to FR7213445A priority patent/FR2133821B1/fr
Publication of GB1360235A publication Critical patent/GB1360235A/en
Expired legal-status Critical Current

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.
GB973671A 1971-04-17 1971-04-17 Acoustic surface wave devices Expired GB1360235A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1512686A (en) * 1975-08-18 1978-06-01 Mullard Ltd Acoustic surface wave devices

Cited By (7)

* Cited by examiner, † Cited by third party
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