ELASTIC WAVE DEVICE

WIPO Patent Application WO/2019/177028

A1

Provided is an elastic wave device capable of suppressing both transverse mode ripples and the response at the upper end of a stopband. This elastic wave device 1 comprises series arm resonators S1-S4 comprising first IDT electrodes and parallel arm resonators P1-P3 comprising second IDT electrodes. In each of the first IDT electrodes, a first envelope that is an imaginary line formed by joining the ends of a plurality of first electrode fingers extends so as to be inclined in relation to an elastic wave propagation direction and a second envelope that is an imaginary line formed by joining the ends of a plurality of second electrode fingers extends so as to be inclined in relation to the elastic wave propagation direction. Each of the second IDT electrodes has a central area, a first slow-sound-speed area where the speed of sound is slower than in the central area, a second slow-sound-speed area where the speed of sound is slower than in the central area, a first fast-sound-speed area where the speed of sound is faster than in the central area, and a second fast-sound-speed area where the speed of sound is faster than in the central area.

DAIMON KATSUYA (JP)
KOYANAGI TAKUYA (JP)

PCT/JP2019/010286

September 19, 2019

March 13, 2019

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MURATA MANUFACTURING CO (JP)

H03H9/64; H03H9/145; H03H9/25

WO2016208446A1	2016-12-29
WO2018225650A1	2018-12-13
WO2019059208A1	2019-03-28
WO2008126614A1	2008-10-23

JP2016119569A	2016-06-30
JP2014039199A	2014-02-27
JP2003032080A	2003-01-31
JP2012186808A	2012-09-27

MIYAZAKI & METSUGI (JP)

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