Surface acoustic wave filter device and transducer therefor havi

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

1997-04-24

1999-06-01

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 333196, 310313R, 310313B, 310313C, H03H 9145, H03H 964

Patent

active

059091576

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 characteristic, T.T.E. attenuation level, group delay time, etc.

REFERENCES:
patent: 4468642 (1984-08-01), Hikita
patent: 4513261 (1985-04-01), Yen
patent: 5010269 (1991-04-01), Hikita et al.
patent: 5294859 (1994-03-01), Yamanouchi
patent: 5306978 (1994-04-01), Yamanouchi
patent: 5365207 (1994-11-01), Borras
patent: 5438306 (1995-08-01), Yamanouchi
"Technical Handbook for Elastic Wave Devices", pp. 208-209, Nov. 1991, OHM Publishers, Tokyo, Japan.

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