Patent ID: 7411333

Claim:
A surface acoustic wave device comprising: a single crystal piezo-electric substrate; and an interdigital transducer formed of a material mainly containing aluminum and disposed on a surface of said piezo-electric substrate, wherein said single crystal piezo-electric substrate contains an additive, and has an orientation rotated by an angle in a range of 42° to 48° from a Y-axis to a Z-axis about an X-axis, said piezo-electric substrate is a lithium tantalate substrate or a lithium niobate substrate, and said additive comprising iron, added at a weight percentage of 1.24 wt. % or less, said interdigital transducer presents a normalized thickness h/λ in a range of 7 to 11 %, said normalized thickness being derived by normalizing a thickness h of said interdigital transducer with a spacing λ between digits of said interdigital transducer.