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GB1433398A - Acoustic surface-wave devices - Google Patents

Acoustic surface-wave devices

Info

Publication number
GB1433398A
GB1433398A GB4808173A GB4808173A GB1433398A GB 1433398 A GB1433398 A GB 1433398A GB 4808173 A GB4808173 A GB 4808173A GB 4808173 A GB4808173 A GB 4808173A GB 1433398 A GB1433398 A GB 1433398A
Authority
GB
United Kingdom
Prior art keywords
transducers
waves
acoustic
track
parallel
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
GB4808173A
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB4808173A priority Critical patent/GB1433398A/en
Publication of GB1433398A publication Critical patent/GB1433398A/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 elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02818—Means for compensation or elimination of undesirable effects
    • H03H9/02874—Means for compensation or elimination of undesirable effects of direct coupling between input and output transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02818—Means for compensation or elimination of undesirable effects
    • H03H9/02866—Means for compensation or elimination of undesirable effects of bulk wave excitation and reflections
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

1433398 Acoustic surface-wave filters MULLARD Ltd 16 Oct 1973 48081/73 Heading H3U An acoustic surface-wave filter comprises a body 1 of piezoelectric material carrying a pair of parallel-connected interdigital input transducers 20, 21 having equal acoustic apertures and adapted to launch surface-waves inwards in a track T1, a pair of parallel-connected interdigital output transducers 30, 31 having equal acoustic apertures and adapted to receive surface-waves passing outwards in a track T2, and a surface-wave coupling means MSC comprising an array of parallel conductive strips 15 arranged to transfer the energy of the waves in the track T1 into acoustic waves in the track T2. Since spurious bulk waves are not transmitted by MSC, the filter stop-band characteristic is stated to be improved. As shown the tracks T1, T2 are parallel and adjacent, and the two pairs of transducers have equal apertures A/2. Capacitive breakthrough between transducers is prevented by earthing one input terminal 9 and output terminal 12, and/or by earthed shielding strips. Other connection arrangements are envisaged. The transducers 21 and 31 may be interchanged or all the transducers may be length weighted like the transducers 20, 21.
GB4808173A 1973-10-16 1973-10-16 Acoustic surface-wave devices Expired GB1433398A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4808173A GB1433398A (en) 1973-10-16 1973-10-16 Acoustic surface-wave devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4808173A GB1433398A (en) 1973-10-16 1973-10-16 Acoustic surface-wave devices

Publications (1)

Publication Number Publication Date
GB1433398A true GB1433398A (en) 1976-04-28

Family

ID=10447310

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4808173A Expired GB1433398A (en) 1973-10-16 1973-10-16 Acoustic surface-wave devices

Country Status (1)

Country Link
GB (1) GB1433398A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0006054A1 (en) * 1978-06-06 1979-12-12 Thomson-Csf Acoustic surface wave filter and intermediate frequency stage for a television receiver comprising same
WO1980002090A1 (en) * 1979-03-21 1980-10-02 Inst Radiotekh Elektron Filter based on the use of surface acoustic waves
EP0051942A2 (en) * 1980-10-25 1982-05-19 Fujitsu Limited Surface acoustic wave filter
GB2175477A (en) * 1984-05-14 1986-11-26 Gold Stars Instr & Electric Co Elastic surface wave device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0006054A1 (en) * 1978-06-06 1979-12-12 Thomson-Csf Acoustic surface wave filter and intermediate frequency stage for a television receiver comprising same
FR2428350A1 (en) * 1978-06-06 1980-01-04 Thomson Csf SURFACE ELASTIC WAVE FILTER AND INTERMEDIATE FREQUENCY STAGE OF A TELEVISION RECEIVER COMPRISING SUCH A FILTER
WO1980002090A1 (en) * 1979-03-21 1980-10-02 Inst Radiotekh Elektron Filter based on the use of surface acoustic waves
EP0051942A2 (en) * 1980-10-25 1982-05-19 Fujitsu Limited Surface acoustic wave filter
EP0051942A3 (en) * 1980-10-25 1982-08-11 Fujitsu Limited Surface acoustic wave filter
GB2175477A (en) * 1984-05-14 1986-11-26 Gold Stars Instr & Electric Co Elastic surface wave device
GB2175477B (en) * 1984-05-14 1990-01-17 Gold Star Instr & Electrics Acoustic surface wave device

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee