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    • 10. 发明公开
    • BOUNDARY ACOUSTIC WAVE DEVICE
    • RAND-SCHALLWELLENEINRICHTUNG
    • EP1722473A4
    • 2008-07-30
    • EP05719833
    • 2005-03-02
    • MURATA MANUFACTURING CO
    • KANDO HAJIME
    • H03H9/02H01L41/09H01L41/18H03H9/13H03H9/145H03H9/25
    • H03H9/0222
    • A boundary acoustic wave device employing an SH boundary acoustic wave, having a high electromechanical coupling coefficient, a low propagation loss, a small power flow angle, a temperature coefficient of frequency TCF in an appropriate range, and a simple structure, and produced through a simple process. The boundary acoustic wave device (1) comprises a dielectric body (3) deposited on one surface of a piezoelectric body (2) composed of LiTaO3, and an IDT (4) as an electrode and reflectors (5, 6) arranged at the boundary of the piezoelectric body (2) and the dielectric body (3). The thickness of the electrode is determined such that the sound velocity of an SH boundary acoustic wave is lower than that of a slow transverse wave propagating through the dielectric body (3) and that of a slow transverse wave propagating through the piezoelectric body (2).
    • 本发明提供一种弹性边界波装置,其具有机电耦合系数高,传播损失小,功率流动角度小,频率温度系数TCF在适当的范围内且结构简单的SH型弹性边界波装置, 简单的过程。 该弹性边界波装置(1)包括:在由LiTaO 3构成的压电体(2)的一个表面上沉积的电介质体(3)和作为电极的IDT(4);以及布置在边界处的反射器(5,6) (2)和电介质体(3)之间。 确定电极的厚度,使得SH边界声波的声速低于传播通过介电体(3)的慢横波和传播通过压电体(2)的慢横波的声速, 。