FR2373917A1 - Filtre d'ondes de surface elastique - Google Patents

Filtre d'ondes de surface elastique

Info

Publication number
FR2373917A1
FR2373917A1 FR7736906A FR7736906A FR2373917A1 FR 2373917 A1 FR2373917 A1 FR 2373917A1 FR 7736906 A FR7736906 A FR 7736906A FR 7736906 A FR7736906 A FR 7736906A FR 2373917 A1 FR2373917 A1 FR 2373917A1
Authority
FR
France
Prior art keywords
transducer
wave filter
surface wave
elastic surface
location
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.)
Granted
Application number
FR7736906A
Other languages
English (en)
Other versions
FR2373917B1 (fr
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 FR2373917A1 publication Critical patent/FR2373917A1/fr
Application granted granted Critical
Publication of FR2373917B1 publication Critical patent/FR2373917B1/fr
Granted 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
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • 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
    • H03H9/02874—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 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)
  • Processing Of Color Television Signals (AREA)

Abstract

Dans le filtre piézoélectrique selon l'invention la longueur de chevauchement des doigts 5 et 6 du transducteur 2 est maximale en un point de ce transducteur qui est plus éloigné de l'autre transducteur, (non représenté et dont l'emplacement est indiqué par la flèche A) que ne l'est le centre du transducteur 2, les longueurs de chevauchement et les pas de ce transducteur 2 variant de façon asymétrique, par rapport audit emplacement, dans des directions d'éloignement et de rapprochement vis-à-vis de l'autre transducteur. Application : filtre IF dans récepteurs de télévision en couleurs.
FR7736906A 1976-12-08 1977-12-07 Filtre d'ondes de surface elastique Granted FR2373917A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP51146504A JPS5931890B2 (ja) 1976-12-08 1976-12-08 弾性表面波フイルタ

Publications (2)

Publication Number Publication Date
FR2373917A1 true FR2373917A1 (fr) 1978-07-07
FR2373917B1 FR2373917B1 (fr) 1982-03-12

Family

ID=15409114

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7736906A Granted FR2373917A1 (fr) 1976-12-08 1977-12-07 Filtre d'ondes de surface elastique

Country Status (5)

Country Link
US (1) US4223285A (fr)
JP (1) JPS5931890B2 (fr)
DE (1) DE2754494C2 (fr)
FR (1) FR2373917A1 (fr)
GB (1) GB1593300A (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55134587A (en) * 1979-04-05 1980-10-20 Sanyo Electric Co Ltd Color television receiver
JPS5648708A (en) * 1979-09-28 1981-05-02 Hitachi Ltd Surface elastic wave filter
US4321567A (en) * 1980-03-24 1982-03-23 Raytheon Company Combining series sections weighting with withdrawal weighting in SAW transducers
JPS5992613A (ja) * 1982-11-19 1984-05-28 Hitachi Ltd 弾性表面波装置
US4531149A (en) * 1983-06-24 1985-07-23 Rca Corporation Digital variable group delay equalizer for a digital television receiver
GB2157522B (en) * 1984-04-09 1987-08-19 Philips Electronic Associated Electrical filter comprising an acoustic surface wave device, and method of manufacturing such a filter
US4825467A (en) * 1986-11-25 1989-04-25 International Telesystems, Inc. Restricted access television transmission system
US5654774A (en) * 1995-06-06 1997-08-05 Thomson Consumer Electronics, Inc. Tuner for digital satellite receiver
TW353245B (en) * 1995-06-06 1999-02-21 Thomson Consumer Electronics Saw filter for a tuner of a digital satellite receiver
US9568190B2 (en) 2014-06-13 2017-02-14 Integrated Energy LLC Systems, apparatus, and methods for treating waste materials

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036374A5 (fr) * 1969-03-12 1970-12-24 Thomson Csf
US3675163A (en) * 1970-08-26 1972-07-04 Clinton S Hartmann Cascaded f. m. correlators for long pulses
GB1499330A (en) * 1974-09-26 1978-02-01 Plessey Co Ltd Acoustic surface wave filters
DE2524649C3 (de) * 1975-06-03 1980-11-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Fernseh-ZF-Filter nach dem Oberflächenwellenprinzip
US4047130A (en) * 1976-08-27 1977-09-06 Rockwell International Corporation Surface acoustic wave filter

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EXBK/76 *
NV8090/73 *
NV8099/76 *

Also Published As

Publication number Publication date
GB1593300A (en) 1981-07-15
JPS5931890B2 (ja) 1984-08-04
DE2754494A1 (de) 1978-06-22
US4223285A (en) 1980-09-16
DE2754494C2 (de) 1984-01-05
JPS5371548A (en) 1978-06-26
FR2373917B1 (fr) 1982-03-12

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