Surface acoustic wave filter device with symmetrical electrode a

Details Surface acoustic wave filter device with symmetrical electrode a Surface acoustic wave filter device with symmetrical electrode a

1993-07-01

1995-08-01

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313B, H03H 964

Patent

active

054383064

ABSTRACT:
A surface acoustic wave filter device includes a substrate which includes quartz or the like piezoelectric material having a small temperature coefficient. The substrate has a surface which is formed with interdigital-type unidirectional transducers on input and output sides, each having a positive electrode and a negative electrode. The positive electrodes and the negative electrodes of each of the input side and output side transducers have electrode fingers which are arranged so as to transduce a harmonic wave of a selected order which is higher relative to a fundamental surface acoustic wave.

REFERENCES:
patent: 3727155 (1973-04-01), DeVries
patent: 3748603 (1973-07-01), Wojak
patent: 3987376 (1976-10-01), Kerbel
Japanese Journal of Applied Physics, Supplements, vol. 30 SU, No. 1, 1991, Tokyo JA, pp. 173-175, XP000305676 Yamanouchi et al. "Wide Bandwidth Low Loss Filters Using Piezoelectric Leaky Saw Unidirectional Transucers With Floating Electrodes".
IEEE Transactions on Microwave Theory and Techniques, vol. 33, No. 6, Jun. 1985, New York US pp. 510-518, Mitsutaka Hikita et al. "800-MHZ High-Performance Saw Filter Using new Resonant Configuration".
Siemens Forschungs-und Entwicklungsberichte, vol. 6, No. 3, 1977, Berling De pp.132-136, A. Gunther et al. "Speeding Up the Anaysis of Surface Acoustic Wve Devices".

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