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    Surface acoustic wave filter apparatus and communications apparatus
    1.
    发明公开
    Surface acoustic wave filter apparatus and communications apparatus 有权
    AkustischeOberflächenwellenfiltervorrichtungund Kommunikationseinrichtung

    公开(公告)号：EP1251638A2

    公开(公告)日：2002-10-23

    申请号：EP02290977.4

    申请日：2002-04-18

    申请人： Murata Manufacturing Co., Ltd.

    发明人： Sawada, Yoichi

    IPC分类号： H03H9/64

    CPC分类号： H03H9/0071 ,  H03H9/0085

    摘要： First through fourth longitudinally-coupled-resonator-type SAW filter devices (101-4) are formed on a piezoelectric substrate. Each SAW filter device includes three interdigital transducers (IDTs) (121-3/122,123,128) disposed in a SAW propagating direction, and reflectors (124,125/126,127) disposed such that they sandwich the IDTs therebetween. The SAW filter devices are provided with a balanced-to-unbalanced input/output function. The reflectors (124-5) of the first and second SAW filter devices (101-2) are different from those (126-7) of the third and fourth SAW filter devices (126-7) in at least one of the number, the pitch, the duty ratio, and the thickness of the electrode fingers of the reflectors.

    摘要翻译： 第一至第四纵向耦合谐振器型SAW滤波器件（101-4）形成在压电基片上。 每个SAW滤波器装置包括以SAW传播方向设置的三个叉指式换能器（IDT）（121-3 / 122,123,128）和设置成它们将IDT夹在其间的反射器（124,125 / 126,127）。 SAW滤波器装置具有平衡到不平衡的输入/输出功能。 第一和第二SAW滤波器装置（101-2）的反射器（124-5）与第三和第四SAW滤波器装置（126-7）的反射器（124-5）的不同之处在于， 反射器的电极指的间距，占空比和厚度。

    Surface acoustic wave apparatus and communications unit
    2.
    发明公开
    Surface acoustic wave apparatus and communications unit 有权
    AkustischeOberflächenwellenanordnungund Kommunikationssystem

    公开(公告)号：EP2372910A1

    公开(公告)日：2011-10-05

    申请号：EP11171428.3

    申请日：2002-03-12

    申请人： Murata Manufacturing Co. Ltd.

    发明人： Sawada, Yoichi ,  Takasaki, Hiroshi

    IPC分类号： H03H9/64 ,  H03H9/00 ,  H03H9/25 ,  H03H9/02

    CPC分类号： H03H9/0071 ,  H03H9/0085 ,  H03H9/02866

    摘要： A surface acoustic wave apparatus comprises first to fourth surface acoustic wave (SAW) filter devices (1,3,2,4). The first and third SAW filter devices (1,2) are cascade-connected, the second and fourth SAW filter devices (3,4) are cascade-connected, a propagation path of the first SAW filter device (1) is partially overlapped with a propagation path of the second SAW filter device (3), and a propagation path of the third surface SAW filter device (2) is partially overlapped with a propagation path of the fourth SAW filter device (4). When the center-to-center distance between the first and second SAW filter devices (1,3) is indicated by d 1, the center-to-center distance between the third and fourth SAW filter devices (2,4) is indicated by d 2 , and a wavelength of a surface acoustic wave to be excited is indicated by the first through fourth surface acoustic wave filter devices (1, 3, 2, 4) are disposed so that the center-to-center distance d 1 is differentiated from the center-to-center distance d 2 by an amount equal to approximately (2n+1) x 0.5 A (n = 0, 1, 2, 3, and so on).

    摘要翻译： 表面声波装置包括第一至第四表面声波（SAW）滤波器装置（1,3,2,4）。 第一和第三SAW滤波器装置（1,2）级联连接，第二和第四SAW滤波器装置（3,4）级联连接，第一SAW滤波器装置（1）的传播路径部分地与 第二SAW滤波器件（3）的传播路径和第三表面SAW滤波器件（2）的传播路径与第四SAW滤波器件（4）的传播路径部分重叠。 当第一和第二SAW滤波器装置（1,3）之间的中心到中心距离由d 1表示时，第三和第四SAW滤波器装置（2,4）之间的中心到中心距离由 d 2，并且由第一至第四表面声波滤波器装置（1,3,2,4）表示的被激励的表面声波的波长被设置为使得中心到中心距离d 1被区分 从中心到中心距离d 2等于大约（2n + 1）×0.5A（n = 0,1,2,3等）的量。

    Surface acoustic wave filter apparatus and communications apparatus
    3.
    发明公开
    Surface acoustic wave filter apparatus and communications apparatus 有权
    一种表面声波滤波器装置和通信装置

    公开(公告)号：EP1251638A3

    公开(公告)日：2010-02-03

    申请号：EP02290977.4

    申请日：2002-04-18

    申请人： MURATA MANUFACTURING CO., LTD.

    发明人： Sawada, Yoichi

    IPC分类号： H03H9/64 ,  H03H9/00 ,  H03H9/25 ,  H03H9/02

    CPC分类号： H03H9/0071 ,  H03H9/0085

    摘要： First through fourth longitudinally-coupled-resonator-type SAW filter devices (101-4) are formed on a piezoelectric substrate. Each SAW filter device includes three interdigital transducers (IDTs) (121-3/122,123,128) disposed in a SAW propagating direction, and reflectors (124,125/126,127) disposed such that they sandwich the IDTs therebetween. The SAW filter devices are provided with a balanced-to-unbalanced input/output function. The reflectors (124-5) of the first and second SAW filter devices (101-2) are different from those (126-7) of the third and fourth SAW filter devices (126-7) in at least one of the number, the pitch, the duty ratio, and the thickness of the electrode fingers of the reflectors.