| 摘要 |
A surface acoustic wave device includes a LiNbO<SUB>3 </SUB>substrate with a Euler angle in an area defined by a rectangle having four comers with coordinates ( 1 ) (0°, 7°, 101°), ( 2 ) (0°, 23°, 79°), ( 3 ) (0°, 23°, 79°), and ( 4 ) (0°, 7°, 79°), for example, and an electrode film made of Au, wherein surface acoustic waves including a longitudinal wave component as a main component are propagated thereon. The surface acoustic wave device uses longitudinal surface acoustic waves having a phase speed greater than with the "slow transverse wave", and has a great electromechanical coupling coefficient and small propagation loss, and is suitable for handling high-frequency signals.
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