Surface-acoustic-wave device having an improved pass-band charac

Details Surface-acoustic-wave device having an improved pass-band charac Surface-acoustic-wave device having an improved pass-band charac

1996-12-03

1999-10-05

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, H03H 964

Patent

active

059631147

ABSTRACT:
A surface-acoustic-wave device includes at least first and second surface-acoustic-wave elements formed on a common piezoelectric substrate and cascaded with each other, each of the first and second surface-acoustic-wave elements including a plurality of interdigital electrodes having a plurality of electrode fingers overlapping with each other in correspondence to a path of a surface acoustic wave on the piezoelectric substrate, wherein the width of overlapping of the electrode fingers is changed between the first surface-acoustic-wave element and the second surface-acoustic-wave element.

REFERENCES:
patent: 4365219 (1982-12-01), Nathan
patent: 5334960 (1994-08-01), Penunuri
patent: 5363074 (1994-11-01), Higgins, Jr.
patent: 5485052 (1996-01-01), Seki et al.
patent: 5666092 (1997-09-01), Yamamoto et al.
Patent Abstracts of Japan, vol. 17, No. 518 (E-1434), Sep. 17, 1993 & JP 05 136651 A (Toyo Commun Equip Co Ltd), Jun. 1, 1993.

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