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Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/123882
Kind Code:
A1
Abstract:
Provided is an elastic wave device that is able to inhibit transverse-mode spurious emissions. An elastic wave device 1 is provided with a piezoelectric substrate 2, an IDT electrode 3 mounted on the piezoelectric substrate 2, and two reflectors 5, 7 that are mounted on the piezoelectric substrate 2, at both sides of the IDT electrode 3, in an elastic wave propagation direction. Each reflector 5, 7 has a first bus bar 5a, 7a and a second bus bar 5b, 7b opposing each other, and first to third electrode fingers 6a-6c, 8a-8c. The first bus bar 5a, 7a and the second bus bar 5b, 7b are connected to each other by at least one third electrode finger 6c, 8c. When a direction in which the first to third electrode fingers 6a-6c, 8a-8c are extended is defined as a length direction, each reflector 5, 7 has a center region A located at the center in the length direction, and a first high sound speed region which is located between the center region A and the first bus bar 5a, 7a and in which the sound speed is higher than that in the center region A.

Inventors:
TAKIGAWA KAZUHIRO (JP)
Application Number:
PCT/JP2017/046171
Publication Date:
July 05, 2018
Filing Date:
December 22, 2017
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145
Foreign References:
JPS6084451A1985-05-13
JPS5971970A1984-04-23
JPS63211910A1988-09-05
JP2012186808A2012-09-27
JP2001267880A2001-09-28
JP2001308676A2001-11-02
JP2013518455A2013-05-20
JP2000323957A2000-11-24
JP2000022491A2000-01-21
JP2000031780A2000-01-28
JPS62142409A1987-06-25
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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