Surface acoustic wave filter utilizing a transducer having inter

Details Surface acoustic wave filter utilizing a transducer having inter Surface acoustic wave filter utilizing a transducer having inter

1996-05-29

1998-12-01

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313B, H03H 964, H03H 925

Patent

active

058444530

ABSTRACT:
A surface acoustic wave filter according to the present invention has one or a plurality of filter functional units each comprising a series arm resonator and a parallel arm resonator. Each of the series arm resonator and the parallel arm resonator is constituted by a interdigital transducer and grating reflectors formed on a piezoelectric substrate composed of 64.degree.-rotated Y-cut X-propagating LiNbO.sub.3. The series arm resonator is constructed by electrically connecting a one-port resonator in series with a signal line, and the parallel arm resonator is constructed by electrically connecting a one-port resonator in parallel with the signal line. In the interdigital transducer in the series arm resonator and/or the parallel arm resonator, one or more sets of electrode fingers continuously adjacent to each other are formed.

REFERENCES:
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patent: 4742319 (1988-05-01), Sone
patent: 5304965 (1994-04-01), Manner
patent: 5363074 (1994-11-01), Higgins, Jr.
patent: 5589806 (1996-12-01), Taguchi et al.
patent: 5600287 (1997-02-01), Kwan et al.
"900 MHz Range Wideband Double Mode SAW Filters," Morita et al., Journal of Institute of Communication Engineering of Japan, A vol., j76-A, No. 2, pp. 227-235, Feb. 1993.
"Development of SAW Bandpass Filters for Portable Telephones Using Weighting for the Number of Finger Pairs", Satoh et al., The Transaction of The Institute of Electrical Engineers of Japan, vol. 111--C, No. 9, pp. 396-403, 1991.

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