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    Surface acoustic wave device having reflectors with both open and shorted electrodes
    7.
    发明授权
    Surface acoustic wave device having reflectors with both open and shorted electrodes 有权
    表面声波装置具有带有开路和短路电极的反射器

    公开(公告)号：US07157991B2

    公开(公告)日：2007-01-02

    申请号：US10746255

    申请日：2003-12-29

    申请人： Osamu Kawachi ,  Takuya Abe ,  Yasufumi Kaneda ,  Motoyuki Tajima

    发明人： Osamu Kawachi ,  Takuya Abe ,  Yasufumi Kaneda ,  Motoyuki Tajima

    IPC分类号： H03H9/25 ,  H03H9/64

    CPC分类号： H03H9/02771

    摘要： A surface acoustic wave device for implementing an attenuation characteristic outside of the pass band and the narrow band characteristics, preferably for use as a filter. The surface acoustic wave device includes a piezoelectric substrate, interdigital transducers formed on the piezoelectric substrate, and first and second reflectors disposed on the sides of the interdigital transducers. Each of the first and second reflectors includes an open electrode block with a plurality of electrically independent electrode fingers, and a short electrode block with a plurality of electrode fingers of which both ends are electrically shorted.

    摘要翻译： 用于实现通带外的衰减特性和窄带特性的表面声波装置，优选用作滤波器。 表面声波装置包括压电基板，形成在压电基板上的叉指换能器，以及设置在叉指式换能器侧面的第一和第二反射器。 第一和第二反射器中的每一个包括具有多个电独立电极指的开放电极块，以及具有多个电极指的短电极块，其两端电气短路。

    BALANCE FILTER
    8.
    发明申请
    BALANCE FILTER 失效
    平衡过滤器

    公开(公告)号：US20090261921A1

    公开(公告)日：2009-10-22

    申请号：US12392622

    申请日：2009-02-25

    申请人： Akira MORIYA ,  Yasufumi Kaneda ,  Osamu Kawachi

    发明人： Akira MORIYA ,  Yasufumi Kaneda ,  Osamu Kawachi

    IPC分类号： H03H9/54 ,  H03H9/64 ,  H03H7/42

    CPC分类号： H03H9/0076 ,  H03H9/02913 ,  H03H9/1092

    摘要： A balance filter includes two acoustic wave filters connected between a single unbalanced terminal and two balanced terminals, and a ground terminal connected to the two acoustic wave filters via a first interconnection portion and a second interconnection portion. The first interconnection portion is connected to the two acoustic wave filters, and the second interconnection portion is connected to the first interconnection portion in a region that is located between the two acoustic wave filters and extends in a direction orthogonal to a direction in which the two acoustic wave filters are aligned.

    摘要翻译： 平衡滤波器包括连接在单个不平衡端子和两个平衡端子之间的两个声波滤波器，以及经由第一互连部分和第二互连部分连接到两个声波滤波器的接地端子。 第一互连部分连接到两个声波滤波器，并且第二互连部分在位于两个声波滤波器之间的区域中连接到第一互连部分，并且在与两个声波滤波器的方向正交的方向上延伸 声波滤波器对齐。

    Surface acoustic wave filter with optimized width and pitch of interdigital electrodes and reflector electrodes
    9.
    发明授权
    Surface acoustic wave filter with optimized width and pitch of interdigital electrodes and reflector electrodes 失效
    表面声波滤波器，具有优化的叉指电极和反射器电极的宽度和间距

    公开(公告)号：US06498548B2

    公开(公告)日：2002-12-24

    申请号：US09863443

    申请日：2001-05-24

    申请人： Yasufumi Kaneda ,  Masanori Ueda ,  Osamu Kawachi ,  Takuya Abe

    发明人： Yasufumi Kaneda ,  Masanori Ueda ,  Osamu Kawachi ,  Takuya Abe

    IPC分类号： H03H964

    CPC分类号： H03H9/6433

    摘要： A surface acoustic wave filter is free from any loss arising from the impedance mismatching by finding out optimum values achieving a widened band and lowered loss for the electrode width of the interdigital transducer and reflector electrodes. The surface acoustic wave filter includes interdigital transducers and reflectors arranged on both sides of the transducer. The piezoelectric substrate has a ratio h/&lgr; of an electrode thickness h to a surface acoustic wave wavelength &lgr; lying within the range of 0.05≦h/&lgr;0.15 and has an electrode width ratio wr/pr of a reflector electrode width wr to an electrode pitch pr lying within the range of 0.5≦wr/pr≦0.6 and has an electrode width ratio wi/pi of an interdigital transducer interdigital electrode width wi to a pitch pi lying within the range of 0.6≦wi/pi≦0.9.

    摘要翻译： 表面声波滤波器通过找到实现扩宽带的最佳值和降低叉指式换能器和反射器电极的电极宽度的损耗而不受由阻抗失配引起的任何损失。 表面声波滤波器包括布置在换能器两侧的叉指换能器和反射器。 压电基板的电极厚度h与表面声波波长兰德的比率h / lambd在0.05 <= h / lambd0.15的范围内，并且反射器电极宽度wr的电极宽度比wr / pr 电极间距pr在0.5 <= wr / pr <= 0.6的范围内，并且具有叉指式换能器叉指电极宽度wi的电极宽度比wi / pi至间距p 1在0.6 <= wi / pi <= 0.9。