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    • 5. 发明授权
    • Elastic wave device and filter and electronic equipment using the device
    • 弹性波装置及滤波器及电子设备采用该装置
    • US07982365B2
    • 2011-07-19
    • US12428591
    • 2009-04-23
    • Rei GotoHidekazu NakanishiHiroyuki Nakamura
    • Rei GotoHidekazu NakanishiHiroyuki Nakamura
    • H01L41/08
    • H03H9/0222
    • The elastic wave device of the present invention has an piezoelectric substrate; a first dielectric layer disposed on the piezoelectric substrate; a second dielectric layer disposed on the first dielectric layer; and an acoustical layer on the second dielectric layer. Determining each film thickness of the first and the second dielectric layers provides advantageous effects. That is, energy of an SH wave as a main wave is confined in the boundary between the piezoelectric substrate and the first dielectric layer, and at the same time, an SV wave is suppressed as an unwanted wave. The device allows the SV wave—whose displacement distribution is similar to that of Stoneley wave—to have displacement distribution on the upper surface of the second dielectric layer and to be suppressed by the acoustical layer disposed on the second dielectric layer.
    • 本发明的弹性波装置具有压电基板; 设置在所述压电基板上的第一电介质层; 设置在所述第一电介质层上的第二电介质层; 以及在第二电介质层上的声层。 确定第一和第二介电层的每个膜厚度提供有利的效果。 也就是说,作为主波的SH波的能量被限制在压电基板和第一介电层之间的边界中,同时,SV波被抑制为不需要的波。 该装置允许其位移分布类似于斯派利波波的SV波在第二介电层的上表面上具有位移分布并且被设置在第二介电层上的声层抑制。