Surface acoustic wave resonator, surface acoustic wave...

Details Surface acoustic wave resonator, surface acoustic wave... Surface acoustic wave resonator, surface acoustic wave...

2006-03-28

2008-11-18

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R, C333S133000

Reexamination Certificate

active

07453335

ABSTRACT:
Disclosed is a surface acoustic wave resonator which comprises, on a piezoelectric substrate19, an IDT electrode1including bus bar electrodes12a, reflector electrodes2disposed to be adjacent to both sides of the IDT electrode1in a main propagation direction F of surface acoustic waves at the IDT electrode1, and auxiliary reflector electrodes3that are disposed at four positions external to the reflector electrodes2on virtual straight lines extending from the bus bar electrodes12aof the IDT electrode1in an inclined manner so that the periodic direction G of periodically arranged electrodes14bis oriented toward the IDT electrode1.

REFERENCES:
patent: 5365138 (1994-11-01), Saw et al.
patent: 6297712 (2001-10-01), Kadota et al.
patent: 7034634 (2006-04-01), Nakamura et al.
patent: 06-009229 (1994-02-01), None
patent: 06-085604 (1994-03-01), None
Machine translation of detailed description of JP 06-085604, Mar. 1994.
Machine translation of detailed description of JP 06-009229 (cited by Applicants), Feb. 1994.
Tsutsumi, et al., “Extremely Low-Loss Saw Filter and Its Application To Antenna Duplexer for The 1.9 GHz PCS Full-Band”, Proceedings of the 2003 IEEE International Frequency Control Symposium, pp. 861-867.
Knuuttila, et al., “Asymmetric Acoustic Radiation in Leaky SAW Resonators on Lithium Tantalate” 1999 IEEE Ultrasonics Symposium, pp. 83-86.

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