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    • 9. 发明授权
    • Elastic wave filter device having narrow-pitch electrode finger portions
    • 具有窄间距电极指部分的弹性波滤波器装置
    • US08339221B2
    • 2012-12-25
    • US13044647
    • 2011-03-10
    • Yuichi Takamine
    • Yuichi Takamine
    • H03H9/64
    • H03H9/0038H03H9/14535
    • A 5-IDT longitudinally coupled resonator type elastic wave filter device includes a narrow-pitch electrode finger portion arranged to increase the steepness of the filter characteristic includes first to fifth IDTs. When the total number of electrode fingers in a first area and a fourth area is Nx and the total number of electrode fingers in a second area and a third area is Ny, an average period of electrode fingers in one of the areas including larger total numbers of the electrode fingers Nx and Ny is greater than that in the area including smaller total numbers of the electrode fingers Nx and Ny. Among the first IDT electrode, the third IDT electrode, and the fifth IDT electrode, the period of electrode fingers in a portion other than the narrow-pitch electrode finger portion of the IDT electrode in the area including the larger numbers of electrode fingers is less than the period of electrode fingers in a portion other than the narrow-pitch electrode finger portion of the IDT electrode in the area including the smaller numbers of electrode fingers.
    • 5-IDT纵向耦合谐振器型弹性波滤波器装置包括设置成增加滤波器特性的陡度的窄间距电极指部分,包括第一至第五IDT。 当第一区域和第四区域中的电极指的总数为Nx,并且第二区域和第三区域中的电极指的总数为Ny时,包括较大总数的区域之一的电极指的平均周期 的电极指Nx和Ny大于包括较小的电极指Nx和Ny总数的区域。 在第一IDT电极,第三IDT电极和第五IDT电极中,包括较大数量的电极指的区域中IDT电极的窄间距电极指部分以外的部分中的电极指的周期较少 比IDT电极的窄间距电极指部分以外的部分的电极指的周期长。