Title:
ELASTIC WAVE ELEMENT, LADDER-TYPE FILTER, BRANCHING FILTER, COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/025235
Kind Code:
A1
Abstract:
Provided is an elastic wave element having excellent electrical characteristics. An elastic wave resonator comprises: a piezoelectric substrate including a piezoelectric body and an IDT electrode; a support substrate; and a first intermediate layer. In the first intermediate layer, the atomic ratio of a metal element is larger than the atomic ratio of a metal element in the piezoelectric body, and the atomic ratio of oxygen is smaller than the atomic ratio of oxygen in the piezoelectric body. The thickness of the piezoelectric body is five times or less the maximum pitch of an electrode finger of the IDT electrode.
Inventors:
KIMURA TOSHIYA (JP)
KIKUCHI SHIGEYUKI (JP)
KIKUCHI SHIGEYUKI (JP)
Application Number:
PCT/JP2021/028287
Publication Date:
February 03, 2022
Filing Date:
July 30, 2021
Export Citation:
Assignee:
KYOCERA CORP (JP)
International Classes:
H03H9/25; H03H9/64; H03H9/72
Domestic Patent References:
| WO2017134980A1 | 2017-08-10 | |||
| WO2019198594A1 | 2019-10-17 | |||
| WO2014077213A1 | 2014-05-22 | |||
| WO2018180418A1 | 2018-10-04 | |||
| WO2019117106A1 | 2019-06-20 | |||
| WO2019039474A1 | 2019-02-28 | |||
| WO2019159555A1 | 2019-08-22 |
Foreign References:
| JP2020102768A | 2020-07-02 | |||
| JP2014039199A | 2014-02-27 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
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