Surface acoustic wave filter apparatus having different...

Details Surface acoustic wave filter apparatus having different... Surface acoustic wave filter apparatus having different...

2005-05-10

2005-05-10

Nguyen, Minh (Department: 2816)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S193000, C310S31300R

Reexamination Certificate

active

06891451

ABSTRACT:
A surface acoustic wave filter apparatus includes extensional-coupling-resonator-mode first through fourth SAW filter devices which are disposed on a piezoelectric substrate. Each SAW filter device includes three interdigital transducers (IDTs) arranged in a SAW propagating direction, and reflectors arranged such that they sandwich the IDTs therebetween. The SAW filter devices have a balanced-to-unbalanced input/output function. The reflectors of the first and second SAW filter devices are different from those of the third and fourth SAW filter devices in at least one of the number, the pitch, the duty, and the thickness of the electrode fingers of the reflectors.

REFERENCES:
patent: 5392013 (1995-02-01), Yamamoto et al.
patent: 5568002 (1996-10-01), Kawakatsu et al.
patent: 5844453 (1998-12-01), Matsui et al.
patent: 5936488 (1999-08-01), Taguchi et al.
patent: 5963114 (1999-10-01), Ueda et al.
patent: 6366179 (2002-04-01), Kuroda
patent: 6483402 (2002-11-01), Endoh et al.
patent: 479402 (2002-03-01), None
patent: 04-054011 (1992-02-01), None
patent: 7-131291 (1995-05-01), None
patent: 10-117123 (1998-05-01), None
patent: 10-261935 (1998-09-01), None
patent: 2001-267885 (2001-09-01), None
G. Endoh, M. Ueda, O. Kawachi and Y. Fujiwara, “High Performance Balanced Type SAW Filters in the Range of 900MHz and 1.9 GHz”; Proceedings of 1997 IEEE Ultrasonics Symposium, 1997, p. 41-44.

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