Patent ID: 8384268

Claim:
A surface acoustic wave device comprising: a piezoelectric substrate including a high acoustic-velocity substrate in which an acoustic velocity of a transverse wave is in a range of about 5400 m/sec to about 8660 m/sec; a LiNbO 3 single-crystal plate provided on the high acoustic-velocity substrate and having Euler angles in a range of about (0°, 67° to 160°, −5° to +5°) or about (90°, 51° to 133°, −5° to +5°); and an electrode provided on the piezoelectric substrate and made of metal; wherein a thickness of the LiNbO 3 single-crystal plate is in a range of about 0.05λ to about 1.6λ when a wavelength of a surface acoustic wave is defined as λ.