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1. (WO2017199485) ELASTIC WAVE APPARATUS

Pub. No.:    WO/2017/199485    International Application No.:    PCT/JP2017/004749
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: H03H 9/145
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: NAKAMURA, Shinichi
中村 普一
Title: ELASTIC WAVE APPARATUS
Abstract:
Provided is an elastic wave apparatus that has high ESD resistance and can reduce insertion loss. An elastic wave apparatus 1 is provided with: a piezoelectric substrate 2 and an IDT electrode 3. The IDT electrode 3 includes a pair of bus bars 4a and 4b facing each other, a plurality of electrode fingers 5a and 5b, and a plurality of dummy electrode fingers 6a and 6b. The width of a leading end of at least one of the electrode fingers 5a and 5b and the dummy electrode fingers 6a and 6b is narrower than the width of the rest portion of the electrode finger 5a, 5b or the dummy electrode finger 6a, 6b to which the leading end belongs. A first straight line that passes through the center at the leading end of the electrode finger 5a, 5b in its width direction and that is parallel to the direction in which the electrode finger 5a, 5b extends, and a second straight line that passes through the center at the leading end of the dummy electrode finger 6a, 6b in its width direction and that is parallel to the direction in which the dummy electrode finger 6a, 6b extends are present at different positions in an elastic wave propagation direction, the dummy electrode finger 6a, 6b facing the electrode finger 5a, 5b through which the first straight line passes.