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    VERTICALLY COUPLED RESONATOR-TYPE ELASTIC SURFACE WAVE FILTER
    31.
    发明公开
    VERTICALLY COUPLED RESONATOR-TYPE ELASTIC SURFACE WAVE FILTER 有权
    具有垂直耦合谐振弹性的表面滤波器

    公开(公告)号：EP2830217A4

    公开(公告)日：2016-02-24

    申请号：EP13764500

    申请日：2013-03-15

    申请人： MURATA MANUFACTURING CO

    发明人： NORICHI TAKAHIRO

    IPC分类号： H03H9/64 ,  H03H9/00 ,  H03H9/145

    CPC分类号： H03H9/0047 ,  H03H9/0057 ,  H03H9/14588 ,  H03H9/6469

    摘要： A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal (10), balanced terminals (20), a piezoelectric substrate, a first surface acoustic wave filter unit (11), a second surface acoustic wave filter unit (12), an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit (11) and the second surface acoustic wave filter unit (12) to each other, and ground wiring lines. The first surface acoustic wave filter unit (11) includes a first IDT (111) and a pair of a second IDT and a third IDT (112). The first IDT (111) includes a pair of first divided comb tooth shaped electrodes (111a) obtained by dividing a comb tooth shaped electrode on the side far from the unbalanced terminal (10) along a central axis x. The pair of first divided comb tooth shaped electrodes (111a) are connected by the interstage wiring lines to the second surface acoustic wave filter unit (12). A comb tooth shaped electrode of the second IDT and a comb tooth shaped electrode of the third IDT (112) on the side far from the unbalanced terminal (10) are respectively connected to ground wiring lines that are routed outside of the interstage wiring lines.

    BOUNDARY ACOUSTIC WAVE FILTER
    37.
    发明公开
    BOUNDARY ACOUSTIC WAVE FILTER 审中-公开
    边界声波滤波器

    公开(公告)号：EP2068443A1

    公开(公告)日：2009-06-10

    申请号：EP07791867.0

    申请日：2007-08-02

    申请人： Murata Manufacturing Co. Ltd.

    发明人： MUKAI, Takao, c/o (A170) IP Department ,  YATA, Masaru, c/o (A170) IP Department ,  FUJII, Yasuhisa, c/o (A170) IP Department

    IPC分类号： H03H9/64 ,  H01L41/09 ,  H01L41/18 ,  H03H9/145 ,  H03H9/25

    CPC分类号： H03H9/6433 ,  H03H9/0028 ,  H03H9/0222 ,  H03H9/02559 ,  H03H9/02574 ,  H03H9/14594 ,  H03H9/6469

    摘要： A boundary acoustic wave filter device that is able to reduce an insertion loss within a pass band is provided. A longitudinally coupled resonator boundary acoustic wave filter device 100 includes: a piezoelectric substance made of LiNbO 3 having a principal plane obtained by rotating the Y-axis through 15 degrees +-10 degrees; a dielectric substance made of silicon oxide and laminated on the piezoelectric substance; and an electrode structure arranged at a boundary between the piezoelectric substance and the dielectric substance. The electrode structure includes: a plurality of IDTs 112 to 114, 122 to 124, 132 to 134, 142 to 144, 152 to 154, and 162 to 164, arranged in a direction in which a boundary acoustic wave propagates; and reflectors 111, 115, 121, 125, 131, 135, 141, 145, 151, 155, 161 and 165, and wherein where in each of the plurality of IDTs, the overlap width of electrode fingers is W and the interval of electrode fingers is P, 20 ≤ W/P ≤ 45 is satisfied.

    摘要翻译： 提供一种能够降低通带内的插入损耗的弹性边界波滤波器装置。 纵耦合谐振器型弹性边界波滤波器元件100具备：由LiNbO 3构成的压电体，其具有使Y轴旋转15度±10度而得到的主面; 由氧化硅制成并且层压在压电物质上的电介质; 以及布置在压电物质和电介质之间的边界处的电极结构。 电极结构包括：沿边界声波传播方向排列的多个IDT112至114,122至124,132至134,142至144,152至154和162至164; 以及反射器111,115,121,125,131,135,141,145,151,155,161和165，并且其中在多个IDT中的每一个中，电极指的重叠宽度是W并且电极的间隔 手指为P，满足20≤W/P≤45。

    ELASTIC WAVE FILTER AND COMMUNICATION DEVICE USING THE SAME
    38.
    发明公开
    ELASTIC WAVE FILTER AND COMMUNICATION DEVICE USING THE SAME 有权
    弹性波滤波器及通信设备

    公开(公告)号：EP1739830A4

    公开(公告)日：2009-04-22

    申请号：EP05728857

    申请日：2005-04-04

    申请人： MURATA MANUFACTURING CO

    发明人： SHIBAHARA TERUHISA ,  TANI MASAKAZU ,  SHIN YASUAKI

    IPC分类号： H03H9/64 ,  H03H9/00 ,  H03H9/02 ,  H03H9/145

    CPC分类号： H03H9/0222 ,  H03H9/0061 ,  H03H9/02952 ,  H03H9/14588 ,  H03H9/6469

    摘要： On a piezoelectric substrate, there are formed a plurality of longitudinally-connected resonator type elastic wave filter elements, which are cascade-connected so as to constitute an elastic wave filter. By reducing the adverse affect of the parasitic capacitance coming into the cascade connection between the longitudinally-connected resonator type elastic wave filter elements, it is possible to improve the impedance matching at the cascade connection point and improve VSWR at the elastic wave filter I/O terminal. The elastic wave filter (350) includes a piezoelectric substrate (300) having a cascade connection of two longitudinally-connected resonator type elastic wave filters (306, 312), each connecting three IDT (302, 303, 304; 308, 309, 310) formed along the propagation direction of the elastic wave. At least in one of the longitudinally-connected resonator type elastic wave filters (306, 311), the IDT (302, 304; 308, 310) have an electrode finger pitch smaller than the electrode finger pitch of the other IDT (303; 309).