Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

2008-07-15

2008-07-15

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S133000

Reexamination Certificate

active

07400218

ABSTRACT:
A surface acoustic wave filter includes a surface acoustic wave substrate, an input transducer, and an output transducer. The input and output transducers are arranged on a surface of the surface acoustic wave substrate. Each of the input and output transducers includes a plurality of electrode fingers that is slanted in a direction that is substantially perpendicular to a surface acoustic wave propagation direction such that an electrode finger pitch changes in the direction that is substantially perpendicular to the surface acoustic wave propagation direction. An electrode finger pitch of a portion of the input transducer is different from an electrode finger pitch of a portion of the output transducer that corresponds to the portion of the input transducer in the surface acoustic wave propagation direction.

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Official communication issued in the counterpart German Application No. 10134092.3, mailed on Jul. 30, 2007.
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Official communication issued in counterpart Japanese Application No. 2003-382390, mailed on Nov. 6, 2007.

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