| 摘要 |
A surface acoustic wave device includes a piezoelectric substrate having a first surface on which comb-like electrodes are formed, and a second surface, and a support substrate joined to the second surface of the piezoelectric substrate. The piezoelectric substrate is made of lithium, tantalate, and the support substrate is made of sapphire. The following expressions being satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>T/t< 1/3 ( 1 )<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>T/lambda> 10 ( 2 )<?in-line-formulae description="In-line Formulae" end="tail"?> where T is a thickness of the piezoelectric substrate, t is a thickness of the support substrate, and lambda is a wavelength of a surface acoustic filter, propagated along the first surface of the piezoelectric substrate.
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