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    • 21. 发明授权
    • Surface acoustic wave device and communications apparatus using the same
    • 声表面波装置及使用其的通信装置
    • US06856218B2
    • 2005-02-15
    • US10329445
    • 2002-12-27
    • Takashi YamazakiKeigo IizawaShigeo Kanna
    • Takashi YamazakiKeigo IizawaShigeo Kanna
    • H03H9/02H03H9/25H03H9/64
    • H03H9/25H03H9/02543
    • The invention provides an in-plane rotational ST-cut SAW resonator that is formed of an in-plane rotational ST-cut crystal plate having Eulerian angles of (0°, 113° to 135°, and ±(40° to 49°)). The in-plane rotational ST-cut SAW resonator can include an interdigital transducer (IDT) electrode for exciting a Rayleigh wave on the main surface. The ratio Lt/Pt of the electrode width Lt and the interelectrode pitch Pt of the IDT electrode is 0.5 or more and 0.65 or less. Accordingly, a reduction in the fluctuation in resonance frequency relative to the variations in an IDT electrode of a surface acoustic wave device by using the in-plane rotated ST-cut crystal plate around the Z′-axis can be achieved.
    • 本发明提供一种面内旋转ST切割SAW谐振器,其由具有(0°,113°至135°和±(40°至49°))的欧拉角的平面内旋转ST切割晶体板形成, )。 平面内旋转ST切割SAW谐振器可以包括用于激励主表面上的瑞利波的叉指式换能器(IDT)电极。 电极宽度Lt的比率Lt / Pt和IDT电极的电极间间距Pt为0.5以上且0.65以下。 因此,通过使用围绕Z'轴的平面内旋转的ST切割晶体板,可以实现相对于声表面波器件的IDT电极的变化的共振频率的波动的减小。