JPS555573A - Surface acoustic wave filter - Google Patents
Surface acoustic wave filterInfo
- 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
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.
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)
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 |
-
1978
- 1978-06-29 JP JP7931878A patent/JPS555573A/en active Pending
Cited By (11)
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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SMITH | Acoustic signal processing devices(surface wave transducer study)[Final Report, 1 May 1973- 30 Nov. 1974] |