GB2044569B - Surface acoustic wave device having asymmetrical amplitudecharacteristics - Google Patents

Surface acoustic wave device having asymmetrical amplitudecharacteristics

Info

Publication number
GB2044569B
GB2044569B GB7939311A GB7939311A GB2044569B GB 2044569 B GB2044569 B GB 2044569B GB 7939311 A GB7939311 A GB 7939311A GB 7939311 A GB7939311 A GB 7939311A GB 2044569 B GB2044569 B GB 2044569B
Authority
GB
United Kingdom
Prior art keywords
amplitudecharacteristics
asymmetrical
acoustic wave
surface acoustic
wave device
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
GB7939311A
Other versions
GB2044569A (en
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB2044569A publication Critical patent/GB2044569A/en
Application granted granted Critical
Publication of GB2044569B publication Critical patent/GB2044569B/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
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6423—Means for obtaining a particular transfer characteristic

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
GB7939311A 1978-11-13 1979-11-13 Surface acoustic wave device having asymmetrical amplitudecharacteristics Expired GB2044569B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13887778A JPS5566120A (en) 1978-11-13 1978-11-13 Elastic surface wave device

Publications (2)

Publication Number Publication Date
GB2044569A GB2044569A (en) 1980-10-15
GB2044569B true GB2044569B (en) 1983-02-23

Family

ID=15232194

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7939311A Expired GB2044569B (en) 1978-11-13 1979-11-13 Surface acoustic wave device having asymmetrical amplitudecharacteristics

Country Status (3)

Country Link
JP (1) JPS5566120A (en)
DE (1) DE2945643A1 (en)
GB (1) GB2044569B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5836012A (en) * 1981-08-27 1983-03-02 Seiko Epson Corp Surface acoustic wave device
JP2817041B2 (en) * 1986-09-19 1998-10-27 株式会社日立製作所 Surface acoustic wave device
DE19512251C2 (en) * 1995-03-31 1997-04-03 Siemens Ag Interdigital converter for a surface filter
GB2306821B (en) 1995-11-03 2000-05-31 Advanced Saw Prod Sa Electro-acoustic device
GB2308530B (en) * 1995-12-21 2000-03-22 Nokia Mobile Phones Ltd Antenna selection control circuitry

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818379A (en) * 1972-12-04 1974-06-18 Hughes Aircraft Co Acoustic surface wave device
FR2319245A1 (en) * 1975-07-24 1977-02-18 Thomson Csf PERFECTED TRANSDUCER FOR SURFACE WAVE FILTER WITH ASYMMETRICAL TRANSFER FUNCTION AND FILTER CONTAINING SUCH A TRANSDUCER
DE2615719A1 (en) * 1976-04-09 1977-10-27 Siemens Ag Filter based on surface wave principle - has weighted and non-weighted transducers giving mean frequency with linear phase characteristic

Also Published As

Publication number Publication date
DE2945643C2 (en) 1988-08-11
JPS5566120A (en) 1980-05-19
DE2945643A1 (en) 1980-06-19
GB2044569A (en) 1980-10-15

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Legal Events

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