Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2011-03-08
2011-03-08
Budd, Mark (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R, C310S31300R
Reexamination Certificate
active
07902716
ABSTRACT:
To provide a surface elastic wave apparatus that suppresses occurrence of fine ripples within a pass band, improves insertion loss and enhances the degree of balance. First and second surface acoustic wave elements (14, 15) that are parallel-connected to a surface acoustic wave resonator (16) respectively have three or more odd-numbered IDTs (2-4, 5-7), each having a plurality of electrode fingers placed along a propagation direction of a surface acoustic wave that is propagated over a piezoelectric substrate (1), and reflectors (8, 20, 21, 10), each having a plurality of electrode fingers that are placed on the two ends of the IDT row, and among all the electrode fingers respectively possessed by the IDTs and reflectors, the polarities of the electrode fingers placed adjacent to a different IDT or reflector are arranged symmetrically centered on the IDT located in the center.
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Iioka Kiyohiro
Nakai Tsuyoshi
Tanaka Hiroyuki
Budd Mark
DLA Piper (LLP) US
Kyocera Corporation
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