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    Balance filter and duplexer
    2.
    发明公开
    Balance filter and duplexer 有权
    平衡滤波器和双工

    公开(公告)号：EP2254244A3

    公开(公告)日：2011-04-13

    申请号：EP10172567.9

    申请日：2007-08-30

    申请人： Taiyo Yuden Co., Ltd.

    发明人： Tajima, Motoyuki ,  Nishizawa, Toshio

    IPC分类号： H03H9/00 ,  H03H9/64 ,  H03H9/72

    CPC分类号： H03H9/008 ,  H03H9/0085 ,  H03H9/14588 ,  H03H9/14591 ,  H03H9/725

    摘要： A manufacturing method of a balance filter comprises preparing a balance filter that includes a first filter (40), a second filter (60), a first terminal (42) and second terminals (44). The first filter (40) has first multimode surface acoustic wave, SAW, filters (40a,40b) connected parallel. The second filter (60) that is connected to the first filter (40) includes one second multimode SAW filter (60b). A first terminal (42) is connected to the first filter (40) through a connection line (54) that runs in a direction in which connections lines between the first and the second filters (40,60) run. Second terminals (44) are connected to the second filter (60). An input terminal of the balance filter is one of the first and second terminals (42,44), and an output terminal thereof is the other. Electric signals transmitted from the first to second filters (40,60) or vice versa are in opposite phase and electric signals being input or output via the second terminals (44) are in opposite phase. An interdigital transducer, IDT (IDT14), located in the center of the second filter (60) has two electrodes; one of the two electrodes is divided into two; one of two divided electrodes is connected to one of the second terminals (44), and the other is connected to another one of the second terminals (44). The phase of the electric signals output via the second terminals (44) is adjusted by separately adjusting the first multimode SAW filters (40a,40b).

    Acoustic wave device
    5.
    发明公开
    Acoustic wave device 审中-公开
    Akustikwellenvorrichtung

    公开(公告)号：EP2278710A2

    公开(公告)日：2011-01-26

    申请号：EP10166713.7

    申请日：2010-06-21

    申请人： Taiyo Yuden Co., Ltd.

    发明人： Nishizawa, Toshio ,  Endo, Go

    IPC分类号： H03H9/64 ,  H03H9/60 ,  H03H9/56 ,  H03H9/70 ,  H03H9/72 ,  H03H7/42

    CPC分类号： H03H7/42 ,  H03H9/568 ,  H03H9/605 ,  H03H9/6483 ,  H03H9/706 ,  H03H9/725

    摘要： An acoustic wave device includes an input terminal (Ant); a balun (20) that is connected to the input terminal, converts a signal input from the input terminal into two anti-phase signals (Rx1,Rx2), and outputs the two anti-phase signals; and a filter (30) that is connected to the balun, and outputs the two anti-phase signals input from the balun as balanced output signals. An output impedance of the balun is equal to an input impedance of the filter, and is larger than an output impedance of the filter.

    摘要翻译： 声波装置包括输入端（Ant）; 连接到输入端子的平衡 - 不平衡转换器（20）将从输入端子输入的信号转换为两个反相信号（Rx1，Rx2），并输出两个反相信号; 以及连接到平衡 - 不平衡变换器的滤波器（30），并且输出从平衡 - 不平衡变换器输入的两个反相信号作为平衡输出信号。 平衡 - 不平衡变换器的输出阻抗等于滤波器的输入阻抗，并且大于滤波器的输出阻抗。