Elastic wave filter

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United States of America Patent

PATENT NO 9019046
APP PUB NO 20130278358A1
SERIAL NO

13862469

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An elastic wave filter includes electrode fingers, a first busbar and a second busbar, and inclined electrode portions each having a narrower distance between the electrode fingers from the first busbar toward the second busbar. The elastic wave filter includes a dummy electrode disposed in at least one of the input-side IDT electrode portion and the output-side IDT electrode portion to suppress reflection of a diffracted elastic wave by the busbar and to suppress spurious response at an end portion in a frequency pass-band. The dummy electrode has a width dimension and a pitch that are determined such that none of a period shorter than a shortest period of the electrode fingers and a period longer than a longest period of the electrode fingers is satisfied.

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Patent Owner(s)

  • NIHON DEMPA KOGYO CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ohtani, Takashi Saitama, JP 14 64
Tsuda, Tadaaki Saitama, JP 11 41

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