Patent ID: 9413334
Filing Date: 2016-08-09
CPC Classification: H01L,H03H

Claim Text:
1. An elastic wave device configured to use an SH surface acoustic wave comprising: a lithium niobate film; a supporting substrate; a high-acoustic-velocity film located on the supporting substrate and configured so that an acoustic velocity of a propagating bulk wave is higher than an acoustic velocity of an elastic wave that propagates on the lithium niobate film; a low-acoustic-velocity film stacked on the high-acoustic-velocity film and configured so that an acoustic velocity of a propagating bulk wave is lower than an acoustic velocity of a bulk wave that propagates in the lithium niobate film, the lithium niobate film being stacked on the low-acoustic-velocity film; and an IDT electrode located on either side of the lithium niobate film; wherein when the lithium niobate film has Euler angles of (0°±5°, θ,0°), the Euler angle θ is in a range of about 0° to about 8° and about 57° to about 180°; and the high-acoustic-velocity film has a thickness of about 0.3λ to about 1λ, where λ is a wavelength of a fundamental mode of the SH surface acoustic wave.