JPS5566118A - Elastic surface wave device - Google Patents

Elastic surface wave device

Info

Publication number
JPS5566118A
JPS5566118A JP14025578A JP14025578A JPS5566118A JP S5566118 A JPS5566118 A JP S5566118A JP 14025578 A JP14025578 A JP 14025578A JP 14025578 A JP14025578 A JP 14025578A JP S5566118 A JPS5566118 A JP S5566118A
Authority
JP
Japan
Prior art keywords
surface wave
lambda0
electrode
electrode fingers
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.)
Pending
Application number
JP14025578A
Other languages
Japanese (ja)
Inventor
Katsuhide Tsukamoto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP14025578A priority Critical patent/JPS5566118A/en
Publication of JPS5566118A publication Critical patent/JPS5566118A/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

Landscapes

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

Abstract

PURPOSE:To obtain an elastic surface wave device which can suppress the mechanical reflected waves by setting the width of the electrode finger of the inter-digital electrode to about 1/8 wavelength lambda0 of the surface wave at the maximum response frequency and also setting the space to about lambda0/8 between the adjacent electrode fingers featuring the different polarities. CONSTITUTION:Length L at overlap part 33 of upper and lower electrode fingers 31 and 32 is set to be proportional to amplitude A of each peak, and at the same time the center of the space between fingers 31 and 32 is set to coincide with the position of each peak. And width w of each electrode finger is set to w=v/8f0=lambda0/8 (v: sound speed of surface wave; lambda0: wavelength of surface wave) when the frequency is defined as f0 near the maximum response of the inter-digital electrode, and also the space is set to w between the adjacent electrode fingers of different polarities. In such constitution, the reflected waves can be offset mutually between edges A and C, B and D, A' and C' and B' and D' each of the electrode fingers. In other words, the reflected wave can be offset mutually between adjacent electrode fingers of different polarities.
JP14025578A 1978-11-13 1978-11-13 Elastic surface wave device Pending JPS5566118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14025578A JPS5566118A (en) 1978-11-13 1978-11-13 Elastic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14025578A JPS5566118A (en) 1978-11-13 1978-11-13 Elastic surface wave device

Publications (1)

Publication Number Publication Date
JPS5566118A true JPS5566118A (en) 1980-05-19

Family

ID=15264521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14025578A Pending JPS5566118A (en) 1978-11-13 1978-11-13 Elastic surface wave device

Country Status (1)

Country Link
JP (1) JPS5566118A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406964A (en) * 1980-07-23 1983-09-27 Oki Electric Industry Co., Ltd. Acoustic surface wave transducer with improved inband frequency characteristics
EP0213372A2 (en) * 1985-08-21 1987-03-11 Siemens Aktiengesellschaft Dispersive interdigital transducer for devices operating with acoustical waves
US4918349A (en) * 1987-11-13 1990-04-17 Hitachi, Ltd. Surface acoustic wave device having apodized transducer provided with irregular pitch electrode group
WO1990005409A1 (en) * 1988-11-04 1990-05-17 Cosmo Holdings Pty. Limited Surface acoustic wave devices
US5028831A (en) * 1990-04-04 1991-07-02 Motorola, Inc. SAW reflectionless quarter-wavelength transducers
US7973449B2 (en) * 2007-12-20 2011-07-05 Vectron International Gmbh & Co. Kg Transducer for surface acoustic waves and a resonator and a filter having said transducer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406964A (en) * 1980-07-23 1983-09-27 Oki Electric Industry Co., Ltd. Acoustic surface wave transducer with improved inband frequency characteristics
EP0213372A2 (en) * 1985-08-21 1987-03-11 Siemens Aktiengesellschaft Dispersive interdigital transducer for devices operating with acoustical waves
US4918349A (en) * 1987-11-13 1990-04-17 Hitachi, Ltd. Surface acoustic wave device having apodized transducer provided with irregular pitch electrode group
WO1990005409A1 (en) * 1988-11-04 1990-05-17 Cosmo Holdings Pty. Limited Surface acoustic wave devices
US5028831A (en) * 1990-04-04 1991-07-02 Motorola, Inc. SAW reflectionless quarter-wavelength transducers
US7973449B2 (en) * 2007-12-20 2011-07-05 Vectron International Gmbh & Co. Kg Transducer for surface acoustic waves and a resonator and a filter having said transducer

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