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1. (WO2018163805) ELASTIC WAVE DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATIONS DEVICE

Pub. No.:    WO/2018/163805    International Application No.:    PCT/JP2018/005991
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Wed Feb 21 00:59:59 CET 2018
IPC: H03H 9/25
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: IWAMOTO, Hideki
岩本 英樹
TAKAI, Tsutomu
▲高▼井 努
NAKAGAWA, Ryo
中川 亮
YAMANE, Takashi
山根 毅
OTAGAWA, Masanori
太田川 真則
Title: ELASTIC WAVE DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATIONS DEVICE
Abstract:
Provided is an elastic wave device capable of suppressing a high-order mode while maintaining favorable characteristics of a main mode. The elastic wave device 1 comprises: a material layer 2 having Euler angles (φ1, θ1, ψ1) and elastic constants at the Euler angles (φ1, θ1, ψ1) indicated by formula (1); a piezoelectric body 3 directly or indirectly laminated on the material layer 2, having Euler angles (φ1, θ1, ψ1), and comprising a single crystal having elastic constants at the Euler angles (φ1, θ1, ψ1) indicated by formula (1); and an IDT electrode 4 provided on at least either a first main surface or a second main surface of the piezoelectric body 3. At least one elastic constant that is not 0 among the elastic constants C11–C66 for the material layer and at least one elastic constant that is not 0 among the elastic constants C11–C66 for the piezoelectric body have opposite signs.