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    Surface-acoustic-wave device having an improved pass-band characteristic and an improved degree of freedom for setting input and output impedences
    21.
    发明公开
    Surface-acoustic-wave device having an improved pass-band characteristic and an improved degree of freedom for setting input and output impedences 失效
    具有改进的带通特性和改进的输入和输出阻抗的调整的SAW滤波器

    公开(公告)号：EP1453201A2

    公开(公告)日：2004-09-01

    申请号：EP04012227.7

    申请日：1996-12-06

    申请人： FUJITSU LIMITED

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

    IPC分类号： H03H9/64

    CPC分类号： H03H9/6469 ,  H03H9/0038 ,  H03H9/0042 ,  H03H9/0061 ,  H03H9/1071 ,  H03H9/25 ,  H03H9/6436 ,  H03H9/6459 ,  H03H9/6466 ,  H03H9/6489

    摘要： A surface-acoustic-wave device includes at least first and second surface-acoustic-wave elements (11, 21) formed on a common piezoelectric substrate (1) and cascaded with each other, each of the first and second surface-acoustic-wave elements including a plurality of interdigital electrodes (11A - 11C; 21A - 21C) having a plurality of electrode fingers overlapping with each other in correspondence to a path of a surface acoustic wave on the piezoelectric substrate, wherein the width (W 1 , W 2 ) of overlapping of the electrode fingers is changed between the first surface-acoustic-wave element and the second surface-acoustic-wave element.

    摘要翻译： 一种表面声波器件包括：在形成在一个共同的压电基片（1）和彼此，每个第一和第二表面声波的级联至少第一和第二表面声波元件（11，21） 元件包括叉指式电极的多个（11A - 11C; 21A - 21C），其具有电极指对应于彼此重叠，以在所述压电基板的表面声波的路径的复数，worin的宽度（W 1，W 2 ）电极指的重叠的在第一表面声波元件和第二表面声波元件之间改变。

    Saw filter and communications device
    22.
    发明公开
    Saw filter and communications device 审中-公开
    锯过滤器和通信设备

    公开(公告)号：EP1443642A2

    公开(公告)日：2004-08-04

    申请号：EP04290193.4

    申请日：2004-01-26

    申请人： Murata Manufacturing Co., Ltd.

    发明人： Takamine, Yuichi c/o (A170) Intel. Prop. Dept.

    IPC分类号： H03H9/02

    CPC分类号： H03H9/0071 ,  H03H9/0042 ,  H03H9/0085 ,  H03H9/02685 ,  H03H9/14582 ,  H03H9/14588 ,  H03H9/643 ,  H03H9/6433 ,  H03H9/6436 ,  H03H9/6469 ,  H03H9/6476

    摘要： A SAW filter (200) includes at least two IDTs (203-205) arranged along a SAW propagation direction on a piezoelectric substrate and first and second reflectors (206,207) sandwiching the IDTs. A group of electrode fingers of each of the first and second reflectors (206,207) is interdigital-width weighted. Further, a method of interdigital-width weighting of the electrode fingers of the first reflector (206) is different from that of interdigital-width weighting of the electrode fingers of the second reflector (207).

    摘要翻译： SAW滤波器（200）包括至少两个沿SAW传播方向排列在压电基片上的IDT（203-205）以及夹在IDT之间的第一和第二反射器（206,207）。 第一和第二反射器（206,207）中的每一个的一组电极指状物是叉指式宽度加权的。 此外，第一反射器（206）的电极指的叉指宽度加权的方法不同于第二反射器（207）的电极指的叉指宽度加权的方法。

    LONGITUDINAL COUPLING SURFACE ACOUSTIC WAVE FILTER
    24.
    发明公开
    LONGITUDINAL COUPLING SURFACE ACOUSTIC WAVE FILTER 有权
    AKUSTISCHESOBERFLÄCHENWELLENFILTERMIT LONGITUDINALER KOPPELUNG

    公开(公告)号：EP1175006A1

    公开(公告)日：2002-01-23

    申请号：EP01901488.5

    申请日：2001-01-22

    申请人： TOYO COMMUNICATION EQUIPMENT CO. LTD.

    发明人： TAKAHASHI, Naoki Toyo Com. Equipment Co., Ltd.

    IPC分类号： H03H9/64 ,  H03H9/145

    CPC分类号： H03H9/6469 ,  H03H9/0061 ,  H03H9/02637 ,  H03H9/14538 ,  H03H9/14552 ,  H03H9/14576 ,  H03H9/14582 ,  H03H9/14585

    摘要： In a filter in which first-order to third-order double mode SAW filters each including three IDT electrodes having an electrode finger pitch L1 are cascaded, to flatten the passband of the filter and reduce the VSWR to 2 or lower, a pitch of electrode fingers of the IDT electrode in the center of one of the double mode SAW filters is set as L2, the electrode fingers of the IDT electrode are eliminated by the same number from both sides, and the eliminated electrode fingers are replaced by dummy electrodes having a pitch L2. L2 is set to be higher than L1.

    摘要翻译： 在其中级联有包括具有电极指间隔L1的三个IDT电极的一阶至三阶双模SAW滤波器的滤波器中，为了使滤波器的通带平坦化并将VSWR降低至2或更低， 将双模式SAW滤波器之一的中心的IDT电极的指状物设定为L2，从两侧除去IDT电极的电极指以相同的数量，并且将消去的电极指状物置换为具有 节距L2。 L2设置为高于L1。

    Surface acoustic wave device
    26.
    发明公开
    Surface acoustic wave device 失效
    AkustischeOberflächenwellenanordnung

    公开(公告)号：EP0845858A2

    公开(公告)日：1998-06-03

    申请号：EP97306882.8

    申请日：1997-09-04

    申请人： FUJITSU LIMITED

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

    IPC分类号： H03H9/02

    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 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° and 42°. A pair of reflectors (10A, 10B) are formed on the substrate and aligned in a row in the direction of propagation. Interdigital transducers (11A, 11B, 11C) 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（10A，10B）形成在基板上并沿着传播方向一行排列。 交叉指型换能器（11A，11B，11C）形成在基板上并沿传播方向排列成行，插入在反射器之间的叉指式换能器，每个叉指换能器具有成对的相互对置的主电极指和次级电极指， 叉指换能器包括至少前传感器，中间换能器和在传播方向上排成行的后传感器。 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的对数的比率在55％至80％的范围内。

    SURFACE ACOUSTIC WAVE FILTER
    27.
    发明公开
    SURFACE ACOUSTIC WAVE FILTER 失效
    AKUSTISCHESOBERFLÄCHENWELLENFILTER

    公开(公告)号：EP0763889A1

    公开(公告)日：1997-03-19

    申请号：EP96906063.1

    申请日：1996-03-15

    申请人： JAPAN ENERGY CORPORATION

    发明人： OHMURA, Masashi Japan Energy Corporation ,  HONMO, Hiroshi Japan Energy Corporation ,  ABE, Hidenori Japan Energy Corporation

    IPC分类号： H03H9/64

    CPC分类号： H03H9/0028 ,  H03H9/6433 ,  H03H9/6469

    摘要： A surface acoustic wave filter constituted by cascading a first electrode structure line including an input/output IDT, two receiving IDTs outside the input/output IDT and two reflectors outside the two receiving IDTs, and a second electrode structure line including an input/output IDT, two receiving IDTs outside the input/output IDT and two reflectors outside the two receiving IDTs. When the surface acoustic wave filter is expressed by an electrically equivalent, symmetrical lattice circuit expressed by a series arm impedance and a parallel arm impedance, a pass band is formed by using at least two resonances of the series arm impedance and at least three resonances of the parallel arm impedance. Thus a surface acoustic wave filter having low supuriousness and a board band is realized.

    摘要翻译： 一种表面声波滤波器，其通过将包括输入/​​输出IDT，输入/输出IDT外部的两个接收IDT和两个接收IDT外部的两个反射器的第一电极结构线级联，以及包括输入/​​输出IDT的第二电极结构线 ，两个在输入/输出IDT外面接收IDT，两个接收IDT之外的两个反射器。 当表面声波滤波器由由串联臂阻抗和平行臂阻抗表示的电等效对称晶格电路表示时，通过使用串联臂阻抗和至少三个谐振的至少两个谐振来形成通带， 并联臂阻抗。 因此，实现了具有低抑制性和板带的表面声波滤波器。