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Patent Searching and Data


Title:
ELASTIC WAVE DEVICE AND COMPOSITE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/003909
Kind Code:
A1
Abstract:
Provided is an elastic wave device capable of suppressing a stop band response in a reflector. This elastic wave device 1 is provided with: an piezoelectric substrate 2; an IDT electrode 6 provided on the piezoelectric substrate 2; and a pair of reflectors 13, 16 provided on both sides, in a first direction x, of the IDT electrode 6, on the piezoelectric substrate 2, where the propagation direction of the elastic wave is the first direction x. When a direction perpendicular to the first direction x is a second direction y, the pair of reflectors 13, 16 respectively have a plurality of electrode fingers 15, 18 extending in the second direction. The electrode fingers 15, 18 respectively have first ends 15c, 18c and second ends 15d, 18d in the second direction. The widths of the electrode fingers at the second ends 15d, 18d are greater than the widths of the electrode fingers at the first ends 15c, 18c. In the electrode finger 15, the width of the electrode finger at an arbitrary position is at least the width of the electrode finger at a position that is closer to the first ends 15c, 18d than the arbitrary position.

Inventors:
DAIMON, Katsuya (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
Application Number:
JP2018/022522
Publication Date:
January 03, 2019
Filing Date:
June 13, 2018
Export Citation:
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Assignee:
MURATA MANUFACTURING CO., LTD. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 〒6178555, JP)
International Classes:
H03H9/145; H03H9/25; H03H9/72
Domestic Patent References:
WO2016208446A12016-12-29
Foreign References:
JP2001285012A2001-10-12
JP2004266827A2004-09-24
JP2014229961A2014-12-08
JP2015177465A2015-10-05
JP2005198020A2005-07-21
JP2014192723A2014-10-06
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (Chuo Odori FN Bldg, 3-8 Tokiwamachi 1-chome, Chuo-ku, Osaka-sh, Osaka 28, 〒5400028, JP)
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