Surface acoustic wave device and communication apparatus...

Details Surface acoustic wave device and communication apparatus... Surface acoustic wave device and communication apparatus...

2006-10-03

2006-10-03

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R

Reexamination Certificate

active

07116189

ABSTRACT:
A SAW device includes two surface-acoustic-wave filter elements arranged so as to have a balanced-to-unbalanced conversion function. The surface-acoustic-wave filter elements include two first reflectors and two second reflectors. In each surface-acoustic-wave filter element, three IDTs are arranged on a piezoelectric substrate in a direction in which surface acoustic waves are transmitted so as to be positioned between one first reflector and one second reflector. The first reflectors differ in structure from the second reflectors.

REFERENCES:
patent: 5621364 (1997-04-01), Ruile et al.
patent: 6650207 (2003-11-01), Tanaka
patent: 7015776 (2006-03-01), Takamine
patent: 10-117123 (1998-05-01), None
patent: 2000-196399 (2000-07-01), None

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