Surface acoustic wave device having a langasite single crystal substrate

摘要

A surface acoustic wave device includes a piezoelectric substrate made of a Langasite single crystal and at least one interdigital transducer including a pair of comb-shaped electrodes which are interdigitated with each other and are in contact with the piezoelectric substrate. The piezoelectric substrate has a Euler angle of approximately (0 DEG , 130 DEG to 170 DEG , 23 DEG to 30 DEG ), whereby the surface acoustic wave device has an excellent TCD and also has a large K2 value.