DE3576258D1 - Verbessertes filter mit akustischen oberflaechenwellen. - Google Patents

Verbessertes filter mit akustischen oberflaechenwellen.

Info

Publication number
DE3576258D1
DE3576258D1 DE8585903936T DE3576258T DE3576258D1 DE 3576258 D1 DE3576258 D1 DE 3576258D1 DE 8585903936 T DE8585903936 T DE 8585903936T DE 3576258 T DE3576258 T DE 3576258T DE 3576258 D1 DE3576258 D1 DE 3576258D1
Authority
DE
Germany
Prior art keywords
surface waves
acoustic surface
improved filter
filter
improved
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 - Fee Related
Application number
DE8585903936T
Other languages
English (en)
Inventor
Richard Meeker
Wei-Shin Tsay
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Application granted granted Critical
Publication of DE3576258D1 publication Critical patent/DE3576258D1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02614—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
    • H03H9/02629—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves of the edges
    • 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
    • H03H9/14502—Surface acoustic wave [SAW] transducers for a particular purpose
    • H03H9/14505—Unidirectional SAW 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
    • H03H9/6489—Compensation of undesirable effects
    • H03H9/6496—Reducing ripple in 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
    • H03H9/02637—Details concerning reflective or coupling arrays
    • H03H9/02653—Grooves or arrays buried in the substrate
    • H03H9/02661—Grooves or arrays buried in the substrate being located inside the interdigital transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
DE8585903936T 1984-08-01 1985-07-25 Verbessertes filter mit akustischen oberflaechenwellen. Expired - Fee Related DE3576258D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/636,679 US4577169A (en) 1984-08-01 1984-08-01 Small ripple surface acoustic wave filter with low insertion loss
PCT/US1985/001422 WO1986001054A1 (en) 1984-08-01 1985-07-25 Improved surface acoustic wave filter

Publications (1)

Publication Number Publication Date
DE3576258D1 true DE3576258D1 (de) 1990-04-05

Family

ID=24552897

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585903936T Expired - Fee Related DE3576258D1 (de) 1984-08-01 1985-07-25 Verbessertes filter mit akustischen oberflaechenwellen.

Country Status (6)

Country Link
US (1) US4577169A (de)
EP (1) EP0188604B1 (de)
JP (1) JP2628985B2 (de)
CA (1) CA1237174A (de)
DE (1) DE3576258D1 (de)
WO (1) WO1986001054A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638047B1 (de) * 1988-10-14 1990-11-23 Thomson Csf
US5313177A (en) * 1992-04-06 1994-05-17 Motorola, Inc. Method and apparatus for an acoustic wave filter
US5349359A (en) * 1993-05-10 1994-09-20 Environmental Research Institute Of Michigan Spatially variant apodization
US5528206A (en) * 1994-11-23 1996-06-18 Murata Manufacturing Co., Ltd. Surface acoustic wave filter with attenuated spurious emissions
JP3185591B2 (ja) * 1995-03-03 2001-07-11 株式会社村田製作所 Ｓａｗ共振子
WO2001076064A2 (en) * 2000-03-30 2001-10-11 Sawtek Inc. Die layout for saw devices and associated methods

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675054A (en) * 1970-12-02 1972-07-04 Texas Instruments Inc Series connection of interdigitated surface wave transducers
FR2146541A5 (de) * 1971-07-16 1973-03-02 Thomson Csf
FR2290786A1 (fr) * 1974-11-08 1976-06-04 Thomson Csf Dispositif a reflexion selective d'ondes elastiques de surface
US4006438A (en) * 1975-08-18 1977-02-01 Amp Incorporated Electro-acoustic surface-wave filter device
GB1565756A (en) * 1976-09-30 1980-04-23 Toko Inc Surface elastic wave devices
US4130813A (en) * 1977-05-23 1978-12-19 Raytheon Company Surface wave device having enhanced reflectivity gratings
CA1118883A (en) * 1977-06-02 1982-02-23 Thomas E. Parker Surface acoustic wave transducer fabrication to reduce reflections
JPS5847090B2 (ja) * 1977-08-10 1983-10-20 株式会社村田製作所 弾性表面波フイルタ
US4237433A (en) * 1979-03-13 1980-12-02 Sperry Corporation Surface acoustic wave resonators with integrated internal coupler reflectors
JPS564916A (en) * 1979-06-25 1981-01-19 Murata Mfg Co Ltd Elastic surface wave filter
JPS5715514A (en) * 1980-07-01 1982-01-26 Nec Corp Manufacture for reed screen electrode for elastic surface wave
US4353046A (en) * 1980-11-04 1982-10-05 R F Monolithics, Inc. Surface acoustic wave device with reflectors
JPS57103420A (en) * 1980-12-18 1982-06-28 Toko Inc Grouped unidirectional surface acoustic wave transducer
DE3117747A1 (de) * 1981-05-05 1982-11-25 Kollsman System-Technik GmbH, 8000 München Piezoelektrisches element
US4499440A (en) * 1983-08-22 1985-02-12 United Technologies Corporation Low reflectivity electrodes in semiconductive SAW devices

Also Published As

Publication number Publication date
WO1986001054A1 (en) 1986-02-13
JPS61502930A (ja) 1986-12-11
US4577169A (en) 1986-03-18
CA1237174A (en) 1988-05-24
JP2628985B2 (ja) 1997-07-09
EP0188604A1 (de) 1986-07-30
EP0188604B1 (de) 1990-02-28

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Free format text: BLUMBACH, KRAMER & PARTNER, 65193 WIESBADEN

8339 Ceased/non-payment of the annual fee