Surface acoustic wave transducer

Details Surface acoustic wave transducer Surface acoustic wave transducer

2004-08-20

2009-02-10

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S196000, C310S31300R, C310S31300R

Reexamination Certificate

active

07489213

ABSTRACT:
A surface acoustic wave (SAW) filter includes a transducer having an acoustic track to pass a SAW. A center frequency of the filter excites the SAW. The acoustic track includes cells along a longitudinal direction of the acoustic track. Each cell has electrode fingers. The cells include different cell types, where a cell type is defined by a connection sequence of electrode fingers of a cell. At least some of the cells are functional cells, each for exciting and/or reflecting the SAW. There are at least two functional cells, each of which includes at least one wide electrode finger and at least one narrow electrode finger. A reflective strength of a target functional cell is configurable by changing a width of an electrode finger in the target functional cell but by maintaining an overall width of the target functional cell substantially constant.

REFERENCES:
patent: 5646584 (1997-07-01), Kondratyev et al.
patent: 5831492 (1998-11-01), Solie
patent: 6777855 (2004-08-01), Bergmann et al.
patent: 7071796 (2006-07-01), Ueda et al.
patent: 2002/0158715 (2002-10-01), Nakamura et al.
patent: 2001-237666 (2001-08-01), None
Translation of Written Opinion for Application No. PCT/EP2004/009371.

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