Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/205987
Kind Code:
A1
Abstract:
An elastic wave device (1) propagates elastic waves in the x-axis direction. The elastic wave device (1) is provided with an elastopiezoelectric substrate (2) and a first electrode finger (4b) that extends in the y-axis direction and that is provided on the main surface (2a) of the elastopiezoelectric substrate (2). The elastic wave device (1) is configured so that the elastic wave sonic speed is distributed in the order of mid sonic speed, low sonic speed, and high sonic speed from the center of the first electrode finger (4b) towards the outer side with respect to the y-axis direction. The elastic wave device (1) is further provided with a first dielectric body (41) positioned between the piezoelectric substrate (2) and the tip part of the first electrode finger (4b). An end surface of the first dielectric body (41) with respect to the y-axis direction has a first side surface (S1) and a second side surface (S2). The incline angle of the first side surface (S1) is smaller than the incline angle of the second side surface (S2).
Inventors:
MICHIGAMI AKIRA (JP)
YAMAMOTO KOJI (JP)
YAMAMOTO KOJI (JP)
Application Number:
PCT/JP2021/014195
Publication Date:
October 14, 2021
Filing Date:
April 01, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145
Domestic Patent References:
| WO2012127793A1 | 2012-09-27 | |||
| WO2017013945A1 | 2017-01-26 |
Foreign References:
| US20170155373A1 | 2017-06-01 | |||
| JP2019080093A | 2019-05-23 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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