JPS56153817A - Surface wave filter element - Google Patents

Surface wave filter element

Info

Publication number
JPS56153817A
JPS56153817A JP5632880A JP5632880A JPS56153817A JP S56153817 A JPS56153817 A JP S56153817A JP 5632880 A JP5632880 A JP 5632880A JP 5632880 A JP5632880 A JP 5632880A JP S56153817 A JPS56153817 A JP S56153817A
Authority
JP
Japan
Prior art keywords
electrodes
surface wave
frequency characteristics
unevenness
wave filter
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
Application number
JP5632880A
Other languages
Japanese (ja)
Inventor
Shigeyuki Kita
Takuji Yamada
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5632880A priority Critical patent/JPS56153817A/en
Publication of JPS56153817A publication Critical patent/JPS56153817A/en
Pending 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
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/14552—Transducers of particular shape or position comprising split fingers
    • 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
    • H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
    • 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

Landscapes

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

Abstract

PURPOSE:To reduce the effect of reflected wave generated at an electrode and enhance the frequency characteristics, by forming a minute unevenness at the side edge part of at least the cross part of the electrodes. CONSTITUTION:The frequency characteristics of a surface wave filter is decided by the weighted part of electrodes 11 and 12 crossing each other in a comb-teeth shape, i.e. at the cross part of comb-teeth electrodes 11 and 12. Then an unevenness of about several mu is formed at the side edge parts 13 and 14 of electrodes 11 and 12 at the above-mentioned cross part. For a surface filter having such electrodes 11 and 12, an unevenness is formed at the parts 13 and 14 of electrodes 11 and 12 at the weighted part for the surface wave propagating on the surface of substrate in a working mode. Thus the surface wave has an irregular reflection at the uneven area to be attenuated. As a result, the level of reflection is reduced at electrodes 11 and 12 to enhance the frequency characteristics.
JP5632880A 1980-04-30 1980-04-30 Surface wave filter element Pending JPS56153817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5632880A JPS56153817A (en) 1980-04-30 1980-04-30 Surface wave filter element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5632880A JPS56153817A (en) 1980-04-30 1980-04-30 Surface wave filter element

Publications (1)

Publication Number Publication Date
JPS56153817A true JPS56153817A (en) 1981-11-28

Family

ID=13024110

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5632880A Pending JPS56153817A (en) 1980-04-30 1980-04-30 Surface wave filter element

Country Status (1)

Country Link
JP (1) JPS56153817A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604623A (en) * 1983-06-30 1986-08-05 X-Cyte Inc. Surface acoustic wave passive transponder having non-reflective transducers and pads
US5021699A (en) * 1988-10-14 1991-06-04 Thomson-Csf Interdigital transducer for surface acoustic wave filter
US6531957B1 (en) 1996-11-29 2003-03-11 X-Cyte, Inc. Dual mode transmitter-receiver and decoder for RF transponder tags
CN111294009A (en) * 2018-12-10 2020-06-16 太阳诱电株式会社 Acoustic wave device, filter and multiplexer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604623A (en) * 1983-06-30 1986-08-05 X-Cyte Inc. Surface acoustic wave passive transponder having non-reflective transducers and pads
US5021699A (en) * 1988-10-14 1991-06-04 Thomson-Csf Interdigital transducer for surface acoustic wave filter
US6531957B1 (en) 1996-11-29 2003-03-11 X-Cyte, Inc. Dual mode transmitter-receiver and decoder for RF transponder tags
CN111294009A (en) * 2018-12-10 2020-06-16 太阳诱电株式会社 Acoustic wave device, filter and multiplexer
JP2020096226A (en) * 2018-12-10 2020-06-18 太陽誘電株式会社 Acoustic wave device, filter, and multiplexer

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