Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-06-27
1998-06-23
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333195, 310313R, H03H 964
Patent
active
057709858
ABSTRACT:
A surface acoustic wave (SAW) filter includes a plurality of interdigital transducers located on a piezoelectric substrate along a surface wave propagation direction, at least a single one-port SAW resonator being connected in parallel with an output side of the SAW filter, while the resonance frequency (f.sub.0) of the SAW resonator is set in frequency region level which is lower than the pass band of the SAW filter.
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Patent Abstract of Japan, vo. 15, No. 510 (E-1149) 25 Dec. 1991 & JP-A-03 222 512 (OKI Electric) 1 Oct. 1991 (Abstract).
Co-pending U.S. Patent Application No. 08/271,195.
IEEE Transactions on Microwave Theory And Techniques, "Miniature SAW Antenna Duplexer for 800 -MHz Portable Telephone Used in Cellular in Cellular Radio Systems", vol.36, No. 6, Jun. 1988, New York, pp. 1047-1056.
English Translation of Japan Patent 52-10944.
Ieki Hideharu
Ushiroku Tadamasa
Murata Manufacturing Co. Ltd.
Pascal Robert
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