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Title:
ELASTIC WAVE DEVICE AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/020102
Kind Code:
A1
Abstract:
This elastic wave device comprises: a substrate; a multilayer film located on the substrate; a piezoelectric film located on the multilayer film; and a first excitation electrode and a second excitation electrode located on the piezoelectric film. The first excitation electrode has a plurality of first electrode fingers arranged in an elastic wave-propagation direction at a first pitch p1. The second excitation electrode has a plurality of second electrode fingers arranged in the propagation direction at a second pitch p2. The piezoelectric film is formed of a single crystal of LiTaO3 or a single crystal of LiNbO3. When the thickness of the piezoelectric film is t0, 1.15×p1≤p2, t0≤0.48×p1, and t0≥0.27×p2 are satisfied.

Inventors:
ITO MOTOKI (JP)
Application Number:
PCT/JP2020/027334
Publication Date:
February 04, 2021
Filing Date:
July 14, 2020
Export Citation:
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Assignee:
KYOCERA CORP (JP)
International Classes:
H03H9/145; H03H9/25; H03H9/64
Domestic Patent References:
WO2016088680A12016-06-09
WO2019009246A12019-01-10
WO2017068827A12017-04-27
WO2017115562A12017-07-06
WO2018051846A12018-03-22
Attorney, Agent or Firm:
IIJIMA, YASUHIRO (JP)
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