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    Surface acoustic wave filter device on 40.degree. to 42.degree. rotated Y-X LITAO.sub.3
    4.
    发明授权
    Surface acoustic wave filter device on 40.degree. to 42.degree. rotated Y-X LITAO.sub.3 失效
    表面声波滤波器装置在40°〜42°旋转Y-X LITAO3

    公开(公告)号：US5874869A

    公开(公告)日：1999-02-23

    申请号：US925732

    申请日：1997-09-09

    申请人： Masanori Ueda ,  Osamu Kawachi ,  Gou Endoh ,  Yoshiro Fujiwara

    发明人： Masanori Ueda ,  Osamu Kawachi ,  Gou Endoh ,  Yoshiro Fujiwara

    IPC分类号： H01L41/09 ,  H03H9/00 ,  H03H9/02 ,  H03H9/145 ,  H03H9/25 ,  H03H9/64

    CPC分类号： H03H9/6483 ,  H03H9/0042 ,  H03H9/02559 ,  H03H9/6436 ,  H03H9/6469 ,  H03H2250/00

    摘要： A surface acoustic wave device includes a piezoelectric substrate of a LiTaO.sub.3 single crystal, the crystal having X, Y and Z axes and a cut plane. The X axis of the crystal is oriented in a direction of propagation of surface acoustic waves. The cut plane of the crystal is rotated around the X axis at a rotated angle from the Y axis to the Z axis, the rotated angle being in a range between 40.degree. and 42.degree.. A pair of reflectors are formed on the substrate and aligned in a row in the direction of propagation. Interdigital transducers are formed on the substrate and aligned in the row in the direction of propagation, the interdigital transducers interposed between the reflectors, each interdigital transducer having pairs of mutually opposed primary electrode fingers and secondary electrode fingers, the interdigital transducers including at least a front transducer, a middle transducer and a rear transducer aligned in the row in the direction of propagation. In the device, a ratio of the number of pairs of the electrode fingers in one of the front transducer and the rear transducer to the number of pairs of the electrode fingers in the middle transducer is in a range between 55% and 80%.

    摘要翻译： 表面声波装置包括LiTaO3单晶的压电基片，具有X，Y和Z轴的晶体和切割平面。 晶体的X轴在表面声波的传播方向上取向。 晶体的切割面以X轴旋转，从Y轴向Z轴旋转，旋转角度在40°〜42°的范围内。 一对反射器形成在基板上并沿着传播方向成一排排列。 叉指换能器形成在基板上并沿着传播方向排列成行，插入在反射器之间的叉指换能器，每个叉指换能器具有成对的相互对置的主电极指和辅助电极指，叉指换能器至少包括前部 传感器，中间传感器和后传感器在传播方向上排成一行。 在该装置中，前换能器和后换能器中的一个中的电极指的对数与中间换能器中的电极指对数的比率在55％至80％的范围内。

    Filter including acoustic wave filters connected in parallel
    9.
    发明授权
    Filter including acoustic wave filters connected in parallel 有权
    滤波器包括并联连接的声波滤波器

    公开(公告)号：US07629864B2

    公开(公告)日：2009-12-08

    申请号：US11972336

    申请日：2008-01-10

    申请人： Satoru Ono ,  Osamu Kawachi ,  Hidemitsu Kuboi ,  Kouta Ohkubo

    发明人： Satoru Ono ,  Osamu Kawachi ,  Hidemitsu Kuboi ,  Kouta Ohkubo

    IPC分类号： H03H9/00 ,  H03H9/64 ,  H03H9/215

    CPC分类号： H03H9/0057 ,  H03H9/14597 ,  H03H9/6433 ,  H03H9/6469 ,  H03H9/6473 ,  H03H9/76

    摘要： A filter includes: a first acoustic wave filter having acoustic wave filters cascaded, an input stage of the acoustic wave filters including a first multimode filter; a second acoustic wave filter having acoustic wave filters cascaded, an input stage of these acoustic wave filters including a second multimode filter having an aperture length different from that of the first multimode filter, the second acoustic wave filter receiving an unbalanced in signal applied to the first acoustic wave filter, and having a pass band that does not overlap with that of the first acoustic wave filter.

    摘要翻译： 滤波器包括：具有级联的声波滤波器的第一声波滤波器，包括第一多模滤波器的声波滤波器的输入级; 具有级联的声波滤波器的第二声波滤波器，这些声波滤波器的输入级包括具有不同于第一多模滤波器的孔径长度的第二多模滤波器，第二声波滤波器接收施加到第一多模滤波器的不平衡信号 第一声​​波滤波器，并且具有与第一声波滤波器的通带不重叠的通带。