Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2007-07-17
2007-07-17
Takaoka, Dean (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000
Reexamination Certificate
active
10925881
ABSTRACT:
A surface acoustic wave element1includes a substrate2, an intermediate layer and a piezoelectric layer4laminated on the substrate2, an IDT5disposed on the piezoelectric layer4, a pair of reflectors6and7arranged on both sides of the IDT5, and a protective layer8provided so as to cover the IDT5and the reflectors6and7. The IDT5, that is each of the electrode5aand5b, has a plurality of electrode fingers51juxtaposed with a prescribed spacing and the reflectors6and7have respectively a plurality of reflecting bodies61and71. Further, the pitch Pr of the reflecting body of each reflector6and7is set to be smaller than the pitch Pt of the electrode finger of the IDT5and the ratio Pr/Pt is preferably set to be in the range of 0.7 to 0.9995. According to the surface acoustic wave element1, the impedance characteristic and the insertion loss can be improved. Furthermore, electronic equipment having such surface acoustic wave element is provided.
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Communication from European Patent Office re: related application.
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
Takaoka Dean
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