Surface acoustic wave filter having input and output transducers

Details Surface acoustic wave filter having input and output transducers Surface acoustic wave filter having input and output transducers

1997-01-24

1999-08-10

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 333133, 310313C, 310313D, H03H 964

Patent

active

059364882

ABSTRACT:
A surface acoustic wave filter is provided which performs balanced signal/unbalanced signal conversion. The input and output impedances are different from each other. In a surface acoustic wave filter of the longitudinal mode type, a signal is applied to two terminals of an input interdigital transducer, or a signal is output from two terminals of an output interdigital transducer, thereby consituting a balanced type filter. The aperture length of the input interdigital transducer is different from that of the output interdigital transducer.

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patent: 5721519 (1998-02-01), Onishi et al.
Y Taguchi et al., "A New Balanced-Type RF-Band SAW Filter Using SAW Resonators", IEEE MTT-S International Microwave Symposium Digest, vol. 2, pp. 891-894, May 16-20, 1995.
European Search Report dated May 30, 1997.
Y. Taguchi et al., "A New Balanced-Unbalanced Type RF-Band SAW Filter", IEEE MTT-S Digest, pp. 417-420 (1996).

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