Title:
ELASTIC WAVE DEVICE, DUPLEXER, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/095586
Kind Code:
A1
Abstract:
An elastic wave device 1, having a substrate 3, a multilayer film 5 located on the substrate 3, a piezoelectric layer 7 located on the multilayer film 5, a resonator 15 including an IDT electrode 19 located on the piezoelectric layer 7, and a protective film 37 located on the resonator 15. The resonator 15 is provided with a first resonator 15L and a second resonator 15H having a higher resonance frequency than the first resonator 15L. The protective film 37 has a greater thickness on the first resonator 15L than on the second resonator 15H.
Inventors:
ITO MOTOKI (JP)
Application Number:
PCT/JP2019/039104
Publication Date:
May 14, 2020
Filing Date:
October 03, 2019
Export Citation:
Assignee:
KYOCERA CORP (JP)
International Classes:
H03H9/145; H03H9/25; H03H9/64
Domestic Patent References:
| WO2018198654A1 | 2018-11-01 | |||
| WO2018168836A1 | 2018-09-20 | |||
| WO2016129662A1 | 2016-08-18 | |||
| WO2012176455A1 | 2012-12-27 |
Foreign References:
| JPH06152299A | 1994-05-31 |
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