Surface acoustic wave device.

摘要

A SAW device formed by providing at least one interdigital transducer (23) on a piezoelectric substrate (22) which is prepared by forming a (1120) ZnO piezoelectric thin film (22b) on a (0112) plane alpha -Al2O3 substrate (22a), and forming reflectors (24, 25) on both sides of the interdigital transducer (23) along a surface wave propagation direction. Each of the reflectors (24, 25) is so structured that a ratio H/ lambda of its thickness H to a wavelength lambda of a surface wave is in a range of 0.015 to 0.041. <IMAGE>