Surface acoustic wave filter device and transducer therefor

Details Surface acoustic wave filter device and transducer therefor Surface acoustic wave filter device and transducer therefor

1995-10-31

1997-09-02

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 333195, H03H 964

Patent

active

056636954

ABSTRACT:
A surface acoustic wave filter device suitable for CDMA communication system includes a piezoelectric substrate, and a unidirectional input side transducer and a bidirectional output side transducer are formed on the substrate. The filter device has satisfactory filtering characteristics in terms of insertion loss, frequency characteristics, T.T.E. attenuation level, group delay time, etc.

REFERENCES:
patent: 4468642 (1984-08-01), Hikita
patent: 4513261 (1985-04-01), Yen et al.
patent: 5294859 (1994-03-01), Yamanouchi et al.
patent: 5306978 (1994-04-01), Yamanouchi et al.
patent: 5365207 (1994-11-01), Borras et al.
patent: 5438306 (1995-08-01), Yamanouchi et al.
"Technical Handbook for Elastic Wave Devices", pp. 208-209, Nov. 1991, OHM Publishers, Tokyo, Japan.

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