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    • 10. 发明授权
    • Surface acoustic wave device and portable telephone using same
    • 表面声波装置和便携式电话使用相同
    • US5854527A
    • 1998-12-29
    • US812880
    • 1997-03-06
    • Yasutaka ShimizuAtsuhiro NishikataShigetaka Tonami
    • Yasutaka ShimizuAtsuhiro NishikataShigetaka Tonami
    • H03H9/02H03H9/25H01L41/08
    • H03H9/02559
    • The surface acoustic wave device of the invention comprises a piezoelectric substrate of lithium niobate or lithium tantalate and electrodes formed on the substrate for propagating surface acoustic waves. The substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto. When the substrate is made of lithium niobate, .phi., .theta. and .psi. are 0.degree.-86.degree. or 95.degree.-180.degree., 73.degree.-118.degree. and 0.degree.-44.degree., respectively. When the substrate is made of lithium tantalate, .phi., .theta. and .psi. are 0.degree.-87.degree. or 91.degree.-180.degree., 80.degree.-120.degree. and 0.degree.-44.degree., respectively. This enables the device to exhibit high performance.
    • 本发明的声表面波装置包括铌酸锂或钽酸锂的压电基片和形成在基板上的用于传播表面声波的电极。 衬底具有切割平面和表面声波传播方向,其是以欧拉角度表示的(phi,θ,psi)并且在与其基本相当的范围内。 当底物由铌酸锂制成时,phi,θ和psi分别为0°-86°或95°-180°,73°-118°和0°-44°。 当底物由钽酸锂制成时,phi,θ和psi分别为0°-87°或91°-180°,80°-120°和0°-44°。 这使得设备能够表现出高性能。