JPS555573A - Surface acoustic wave filter - Google Patents

Surface acoustic wave filter

Info

Publication number
JPS555573A
JPS555573A JP7931878A JP7931878A JPS555573A JP S555573 A JPS555573 A JP S555573A JP 7931878 A JP7931878 A JP 7931878A JP 7931878 A JP7931878 A JP 7931878A JP S555573 A JPS555573 A JP S555573A
Authority
JP
Japan
Prior art keywords
terminals
transducers
center
acoustic wave
surface acoustic
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
JP7931878A
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 JP7931878A priority Critical patent/JPS555573A/en
Publication of JPS555573A publication Critical patent/JPS555573A/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
    • H03H9/05—Holders; Supports
    • H03H9/0538—Constructional combinations of supports or holders with electromechanical or other electronic elements
    • H03H9/0542—Constructional combinations of supports or holders with electromechanical or other electronic elements consisting of a lateral arrangement
    • 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
    • H03H9/14597—Matching SAW transducers to external electrical circuits

Landscapes

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

Abstract

PURPOSE:To eliminate the unrequired signal by direct waves, by locating the input and output terminals connected respectively to the transducers at the center and the both sides, symmetrically with respect to the center line. CONSTITUTION:On the surface acoustic wave filter chip 31 supported on the base, the transducers 32, 33, 34 consisting of the crossing finger electrodes are arranged transversally, and the terminals 36 to 41 are connected at their both poles. In this case, the terminals of the transducers 33, 34 at the both sides and the terminal of the transducer 44 at the center are located so that they are not asymmetrical to the center line of the transducer 44 at the center to eliminate the unnecessary signal by the direct waves. For example, when the terminals 36 and 39 are taken as the input terminal and the terminals 40 and 41 are taken as the output terminal by connecting the transducers 33 and 34 in series, the unnecessary signal by the direct waves is induced in phase at the terminals 40 and 41 due to the symmetry of constitution and it can be rejected by the transformer 43.
JP7931878A 1978-06-29 1978-06-29 Surface acoustic wave filter Pending JPS555573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7931878A JPS555573A (en) 1978-06-29 1978-06-29 Surface acoustic wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7931878A JPS555573A (en) 1978-06-29 1978-06-29 Surface acoustic wave filter

Publications (1)

Publication Number Publication Date
JPS555573A true JPS555573A (en) 1980-01-16

Family

ID=13686512

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7931878A Pending JPS555573A (en) 1978-06-29 1978-06-29 Surface acoustic wave filter

Country Status (1)

Country Link
JP (1) JPS555573A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60186109A (en) * 1984-03-06 1985-09-21 Toshiba Corp Surface acoustic wave resonator
JPS60246115A (en) * 1984-05-21 1985-12-05 Murata Mfg Co Ltd Surface wave filter
JPS6145620A (en) * 1984-08-09 1986-03-05 Mitsubishi Electric Corp Delay line
JPS6397920U (en) * 1986-12-15 1988-06-24
JP2003507917A (en) * 1999-08-16 2003-02-25 エプコス アクチエンゲゼルシャフト Dual mode surface acoustic wave filter with improved balance and possibly improved stopband suppression
US6781478B2 (en) 2000-06-26 2004-08-24 Murata Manufacturing Co., Ltd. Longitudinally coupled resonator type surface acoustic wave filter and communication apparatus incorporating the same
US6815868B2 (en) 2001-04-09 2004-11-09 Murata Manufacturing Co., Ltd. Surface acoustic wave apparatus and communication unit
JPWO2008038498A1 (en) * 2006-09-28 2010-01-28 株式会社村田製作所 Balanced elastic wave filter device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60186109A (en) * 1984-03-06 1985-09-21 Toshiba Corp Surface acoustic wave resonator
JPS60246115A (en) * 1984-05-21 1985-12-05 Murata Mfg Co Ltd Surface wave filter
JPS6145620A (en) * 1984-08-09 1986-03-05 Mitsubishi Electric Corp Delay line
JPS6397920U (en) * 1986-12-15 1988-06-24
JP2003507917A (en) * 1999-08-16 2003-02-25 エプコス アクチエンゲゼルシャフト Dual mode surface acoustic wave filter with improved balance and possibly improved stopband suppression
JP4739624B2 (en) * 1999-08-16 2011-08-03 エプコス アクチエンゲゼルシャフト Dual-mode surface wave filter with improved balance and possibly improved stopband suppression
US6781478B2 (en) 2000-06-26 2004-08-24 Murata Manufacturing Co., Ltd. Longitudinally coupled resonator type surface acoustic wave filter and communication apparatus incorporating the same
US7034639B2 (en) 2000-06-26 2006-04-25 Murata Manufacturing Co., Ltd. Longitudinally coupled resonator type surface acoustic wave filter and communication apparatus incorporating the same
US6815868B2 (en) 2001-04-09 2004-11-09 Murata Manufacturing Co., Ltd. Surface acoustic wave apparatus and communication unit
JPWO2008038498A1 (en) * 2006-09-28 2010-01-28 株式会社村田製作所 Balanced elastic wave filter device
JP4873010B2 (en) * 2006-09-28 2012-02-08 株式会社村田製作所 Balanced elastic wave filter device

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