Patent ID: 6847154

Claim:
A surface acoustic wave device comprising: a piezoelectric substrate having an end surface for reflecting a surface acoustic wave generated thereon; a single interdigital transducer disposed on a main surface of the piezoelectric substrate and having a plurality of electrode fingers, the end surface of the piezoelectric substrate being spaced away from an outside edge of the outermost electrode finger of said interdigital transducer; wherein said end surface is arranged so that the distance L from the center of the second electrode finger to the end surface, counting from the outermost side in the surface acoustic wave propagation direction, among the electrode fingers, satisfies the following equation: ( N+ ⅝)λ s≦L≦ ( N+ ⅞)λ s where λs is the wavelength of the surface acoustic wave, and N is 0 or a positive integer.