Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2006-12-12
2006-12-12
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S31300R, C029S025350
Reexamination Certificate
active
07148769
ABSTRACT:
A surface acoustic wave device has a piezoelectric substrate1, and a comb transducer2formed on a surface of the piezoelectric substrate1. Grooves5for eliminating an unnecessary wave are formed in a back surface of the surface acoustic wave device in such a manner that the interval of the adjoining grooves5is decreased as the groove5extends from one end7of the piezoelectric substrate1to the other end8thereof. With this arrangement, angles defined by the extending directions of the respective grooves5and the propagating direction of the surface acoustic wave can be differentiated from each other, and the reflecting conditions of the unnecessary wave to the respective grooves5can be varied from each other. This arrangement enables to improve characteristics of the surface acoustic wave device.
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Matsushita Electric - Industrial Co., Ltd.
Summons Barbara
Wenderoth , Lind & Ponack, L.L.P.
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