Patent ID: 7180222

Claim:
A surface acoustic wave device comprising: a LiNbO 3 substrate; and an electrode film made of one of Au and an alloy of Au as a principal component thereof and disposed on said LiNbO 3 substrate; wherein surface acoustic waves including a longitudinal wave component as a main component propagate along the substrate, an Euler angle of said LiNbO 3 substrate is (φ, θ, ψ),where φ is between about −13° and about 13°, θ is between about 7° and about 23°, and ψ is between about 79° and about 101°, and a ratio H/λ is between about 0.005 and about 0.06, where H is the thickness of said electrode film and λ is the wavelength of the surface acoustic wave.