WO2004006432A3 - Filtre a ondes acoustiques de surface a double mode symetrique optimise - Google Patents

Filtre a ondes acoustiques de surface a double mode symetrique optimise Download PDF

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Publication number
WO2004006432A3
WO2004006432A3 PCT/FR2003/002081 FR0302081W WO2004006432A3 WO 2004006432 A3 WO2004006432 A3 WO 2004006432A3 FR 0302081 W FR0302081 W FR 0302081W WO 2004006432 A3 WO2004006432 A3 WO 2004006432A3
Authority
WO
WIPO (PCT)
Prior art keywords
optimised
acoustic wave
surface acoustic
wave filter
differential
Prior art date
Application number
PCT/FR2003/002081
Other languages
English (en)
Other versions
WO2004006432A2 (fr
Inventor
Marc Solal
Stephane Chamaly
Victor Plessky
Original Assignee
Thales Sa
Marc Solal
Stephane Chamaly
Victor Plessky
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 Thales Sa, Marc Solal, Stephane Chamaly, Victor Plessky filed Critical Thales Sa
Publication of WO2004006432A2 publication Critical patent/WO2004006432A2/fr
Publication of WO2004006432A3 publication Critical patent/WO2004006432A3/fr

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
    • H03H9/6433—Coupled resonator filters
    • H03H9/6436—Coupled resonator filters having one acoustic track only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/0023—Balance-unbalance or balance-balance networks
    • H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
    • H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
    • H03H9/0052—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded
    • H03H9/0057—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded the balanced terminals being on the same side of the tracks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/0023—Balance-unbalance or balance-balance networks
    • H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
    • H03H9/0085—Balance-unbalance or balance-balance networks using surface acoustic wave devices having four acoustic tracks
    • 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
    • H03H9/14588—Horizontally-split 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
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • H03H9/6433—Coupled resonator filters
    • H03H9/644—Coupled resonator filters having two acoustic tracks
    • H03H9/6456—Coupled resonator filters having two acoustic tracks being electrically coupled
    • H03H9/6469—Coupled resonator filters having two acoustic tracks being electrically coupled via two connecting electrodes

Landscapes

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

Abstract

L'invention concerne un filtre à entrée (ou sortie) non différentielle et à sortie (ou entrée) différentielle, à symétrie optimisée, dans lequel deux filtre sont connectés en parallèle du côté de l'entrée (sortie) non différentielle et en série du côté de la sortie (entrée) différentielle, chaque filtre comprenant deux voies acoustiques cascadées, dans lesquelles les tensions des points milieux sont en opposition de phase. La configuration proposée permet d'améliorer la symétrie du filtre, c'est-à-dire le rapport entre les tensions sur les bornes en différentiel qui idéalement doit avoir une amplitude de 1 et une phase de 180°.
PCT/FR2003/002081 2002-07-05 2003-07-04 Filtre a ondes acoustiques de surface a double mode symetrique optimise WO2004006432A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0208471A FR2842044B1 (fr) 2002-07-05 2002-07-05 Filtre a ondes acoustiques de surface a double mode symetrique optimise
FR02/08471 2002-07-05

Publications (2)

Publication Number Publication Date
WO2004006432A2 WO2004006432A2 (fr) 2004-01-15
WO2004006432A3 true WO2004006432A3 (fr) 2004-04-15

Family

ID=29725209

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2003/002081 WO2004006432A2 (fr) 2002-07-05 2003-07-04 Filtre a ondes acoustiques de surface a double mode symetrique optimise

Country Status (2)

Country Link
FR (1) FR2842044B1 (fr)
WO (1) WO2004006432A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1152529A2 (fr) * 2000-04-18 2001-11-07 Murata Manufacturing Co., Ltd. Filtre à ondes acoustiques de surface du type à résonateur couplé longitudinalement
EP1168613A2 (fr) * 2000-06-26 2002-01-02 Murata Manufacturing Co., Ltd. Filtre à ondes acoustiques de surface du type à résonateur couplé transversalement et dispositif de communication comportant le même

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1152529A2 (fr) * 2000-04-18 2001-11-07 Murata Manufacturing Co., Ltd. Filtre à ondes acoustiques de surface du type à résonateur couplé longitudinalement
EP1168613A2 (fr) * 2000-06-26 2002-01-02 Murata Manufacturing Co., Ltd. Filtre à ondes acoustiques de surface du type à résonateur couplé transversalement et dispositif de communication comportant le même

Also Published As

Publication number Publication date
FR2842044A1 (fr) 2004-01-09
WO2004006432A2 (fr) 2004-01-15
FR2842044B1 (fr) 2005-07-15

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