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1. (WO2018163860) ELASTIC WAVE DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, COMMUNICATION DEVICE AND METHOD FOR MANUFACTURING ELASTIC WAVE DEVICE

Pub. No.:    WO/2018/163860    International Application No.:    PCT/JP2018/006681
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Sat Feb 24 00:59:59 CET 2018
IPC: H03H 9/145
H03H 3/08
H03H 9/64
H03H 9/72
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: KIMURA, Tetsuya
木村 哲也
KAAJAKARI, Ville
カーヤカリ ヴィレ
Title: ELASTIC WAVE DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, COMMUNICATION DEVICE AND METHOD FOR MANUFACTURING ELASTIC WAVE DEVICE
Abstract:
Provided is an elastic wave device in which degradation of resonance characteristics does not easily occur. In an end surface reflection type elastic wave device 1 in which an elastic wave is reflected between a first end surface 6c and a second end surface 6d, a first electrode finger 7 and a second electrode finger 8 are provided on a main surface 6a of a piezoelectric body 6. If a portion in which the first electrode finger 7 and the second electrode finger 8 overlap when viewed in a first direction connecting the first and second end surfaces 6c, 6d is referred to as an intersection width portion, and the distance between the first end surface 6c and the second end surface 6d of the piezoelectric body 6 is referred to as the width of the piezoelectric body 6, a different width portion, which has a width different from the width of the piezoelectric body at a central portion in a second direction of the intersection width portion, is provided in a region in which the first end surface 6c and the second end surface 6d face each other.