Patent ID: 7233095
Filing Date: 2007-06-19
Classification: G01K,H03H

Abstract:
1. A single crystal substrate comprising: a langasite substrate with a SAW propagation surface; and input and output IDTs having electrodes on the surface for launching and/or detecting surface acoustic waves, wherein a direction of surface wave propagation is parallel to an X′-axis, and the substrate further has an Z′-axis perpendicular to the surface and a Y′-axis parallel to the surface and perpendicular to the X′-axis, the langasite substrate having a crystal orientation defined by modified axes X, Y and Z, the relative orientation of axes X′, Y′ and Z′ being defined by Euler angles φ, θ and ψ, in which φ is 0°, θ is in a range of 12°≦θ≦17°, and ψ is in a range of 73°≦ψ≦78°.