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11 条记录 (耗时 0.012 秒)

    Filter combining surface acoustic wave resonators
    2.
    发明公开
    Filter combining surface acoustic wave resonators 失效
    滤波器组合表面声波谐波器

    公开(公告)号：EP0269064A3

    公开(公告)日：1989-08-23

    申请号：EP87117300.1

    申请日：1987-11-24

    申请人： HITACHI, LTD. ,  HITACHI VIDEO ENGINEERING, INC.

    发明人： Hikita, Mitsutaka ,  Saigo, Yoichi ,  Kurosawa, Kazuhito

    IPC分类号： H03H9/64 ,  H03H9/02

    CPC分类号： H03H9/6479 ,  H03H9/02755 ,  H03H9/14597 ,  H03H9/6443 ,  H03H9/6463

    摘要： This invention relates to the structure of a band-pass or band-rejection filter by combining a plurality of one-port surface acoustic wave resonators (421 to 433 or Q₁ to Q₄) whose interdigital electrode fingers are disposed on a piezoelectric substrate (10). The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-­port surface acoustic wave resonators (421 to 433 or 70 to 72) disposed on a piezoelectric substrate (10) for transmitting elastic surface wave and a plurality of circuit elements con­taining capacitance elements (431 to 433 or 70 to 72), and one-port surface acoustic wave resonators (421 to 433 or 70 to 72) disposed between the elec­trodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection-­and passing-band.

    Filter combining surface acoustic wave resonators
    3.
    发明公开
    Filter combining surface acoustic wave resonators 失效
    过氧化物酶（AkustischeOberflächenwellenresonatorenkombinierendes）过滤器。

    公开(公告)号：EP0269064A2

    公开(公告)日：1988-06-01

    申请号：EP87117300.1

    申请日：1987-11-24

    申请人： HITACHI, LTD. ,  HITACHI VIDEO ENGINEERING, INC.

    发明人： Hikita, Mitsutaka ,  Saigo, Yoichi ,  Kurosawa, Kazuhito

    IPC分类号： H03H9/64 ,  H03H9/02

    CPC分类号： H03H9/6479 ,  H03H9/02755 ,  H03H9/14597 ,  H03H9/6443 ,  H03H9/6463

    摘要： This invention relates to the structure of a band-pass or band-rejection filter by combining a plurality of one-port surface acoustic wave resonators (421 to 433 or Q₁ to Q₄) whose interdigital electrode fingers are disposed on a piezoelectric substrate (10). The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-­port surface acoustic wave resonators (421 to 433 or 70 to 72) disposed on a piezoelectric substrate (10) for transmitting elastic surface wave and a plurality of circuit elements con­taining capacitance elements (431 to 433 or 70 to 72), and one-port surface acoustic wave resonators (421 to 433 or 70 to 72) disposed between the elec­trodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection-­and passing-band.

    摘要翻译： 本发明涉及通过将交叉指状电极指配置在压电基板（10）上的多个单端口声表面波谐振器（421至433或Q1至Q4）组合而成的带通滤波器或带阻滤波器的结构， 。 本发明的组合弹性表面波谐振器的滤波器由布置在用于传播弹性表面波的压电基片（10）上的单孔表面声波谐振器（421至433或70至72）的串联电路和多个 包括电容元件（431至433或70至72）的电路元件和设置在多个电路元件的电极和公共地之间的单端口声表面波谐振器（421至433或70至72）。 该结构可以实现具有低损耗，高功率处理能力和高排斥和通带的设计自由度的滤波器。

    Surface acoustic wave band-pass filter
    6.
    发明公开
    Surface acoustic wave band-pass filter 失效
    Bandfilter mit akustischenOberflächenwellen。

    公开(公告)号：EP0387679A2

    公开(公告)日：1990-09-19

    申请号：EP90104326.5

    申请日：1990-03-07

    申请人： HITACHI, LTD.

    发明人： Kurosawa, Kazuhito ,  Hikita, Mitsutaka ,  Tabuchi, Toyoji ,  Shibagaki, Nobuhiko, c/o Hitachi D.Kyoushinryou ,  Hirashima, Tetsuya

    IPC分类号： H03H9/64 ,  H03H9/145

    CPC分类号： H03H9/6426 ,  H03H9/02748 ,  H03H9/1455

    摘要： At least one of electro-acoustic transducers (4) of a first surface acoustic wave device (A) and acousto-electric transducers (6) of a second surface acoustic wave device (B) arranged symmetrically to the first surface acoustic wave device about a line (C) parallel to a propagating direction of surface acoustic wave is phase-weighted differently from the remaining transducers having common phase-weighting, to improve an attenuation for stop frequency.

    摘要翻译： 第一声​​表面波装置（A）的电声换能器（4）和第二声表面波装置（B）的声电换能器（6）中的至少一个绕第一声表面波装置 与表面声波的传播方向平行的线（C）与具有公共相位加权的剩余换能器不同地相位加权，以改善停止频率的衰减。

    Surface acoustic wave device
    7.
    发明公开
    Surface acoustic wave device 失效

    公开(公告)号：EP0399537A3

    公开(公告)日：1991-05-02

    申请号：EP90109920.0

    申请日：1990-05-25

    申请人： HITACHI, LTD.

    发明人： Hikita, Mitsutaka ,  Tabuchi, Toyoji ,  Shibagaki, Nobuhiko ,  Isobe, Atsushi ,  Kurosawa, Kazuhito

    IPC分类号： H03H9/145

    CPC分类号： H03H9/14502

    摘要： A surface acoustic wave device comprises a piezoelectric substrate (1) and a plurality of electrode fingers (2, 3, 4, 6, 7, 8) which are located on the piezoelectric substrate along the propagation direction of a surface acoustic wave (10). The electrode fingers are located on the piezoelectric substrate at a pitch of about 1.5λo/2,λo indicating a wavelength of a surface acoustic wave with a frequency equivalent to the center frequency of the surface acoustic wave device. The width of each of the electrode fingers is about 1.5λo/4. Every other electrode finger (3) on the substrate is electrically independent of an external circuit (5, 9). Since the width of electrode fingers is about 1,5λo/4, the surface acoustic wave device can be produced without a very fine processing technic.

    Surface acoustic wave device
    8.
    发明公开
    Surface acoustic wave device 失效
    表面声波器件

    公开(公告)号：EP0399537A2

    公开(公告)日：1990-11-28

    申请号：EP90109920.0

    申请日：1990-05-25

    申请人： HITACHI, LTD.

    发明人： Hikita, Mitsutaka ,  Tabuchi, Toyoji ,  Shibagaki, Nobuhiko ,  Isobe, Atsushi ,  Kurosawa, Kazuhito

    IPC分类号： H03H9/145

    CPC分类号： H03H9/14502

    摘要： A surface acoustic wave device comprises a piezoelectric substrate (1) and a plurality of electrode fingers (2, 3, 4, 6, 7, 8) which are located on the piezoelectric substrate along the propagation direction of a surface acoustic wave (10). The electrode fingers are located on the piezoelectric substrate at a pitch of about 1.5λo/2,λo indicating a wavelength of a surface acoustic wave with a frequency equivalent to the center frequency of the surface acoustic wave device. The width of each of the electrode fingers is about 1.5λo/4. Every other electrode finger (3) on the substrate is electrically independent of an external circuit (5, 9).
    Since the width of electrode fingers is about 1,5λo/4, the surface acoustic wave device can be produced without a very fine processing technic.

    摘要翻译： 本发明提供一种弹性表面波元件，其特征在于，具备压电基板（1）和沿着弹性表面波（10）的传播方向位于压电基板上的多个电极指（2,3,4,6,7,8） 。 电极指以大约1.5λo/ 2的间距位于压电基片上，λo表示具有与弹性表面波装置的中心频率相等的频率的表面声波的波长。 每个电极指的宽度约为1.5λo/ 4。 基板上的每个其他电极指（3）与外部电路（5,9）电独立。 由于电极指的宽度大约为1.5λo/ 4，因此可以在没有非常精细的处理技术的情况下生产表面声波装置。

    Surface acoustic wave filter
    10.
    发明公开
    Surface acoustic wave filter 失效
    表面声波滤波器

    公开(公告)号：EP0337703A3

    公开(公告)日：1990-09-05

    申请号：EP89303519.6

    申请日：1989-04-10

    申请人： HITACHI, LTD.

    发明人： Hikita, Mitsutaka ,  Kurosawa, Kazuhito ,  Tabuchi, Toyoji ,  Shibagaki, Nobuhiko

    IPC分类号： H03H9/64

    CPC分类号： H03H9/6483 ,  H03H9/02755 ,  H03H9/02921 ,  H03H9/6463 ,  H03H9/6479

    摘要： Disclosed is a SAW filter employing a SAW resonator which is constructed of a plurality of pairs of electrode fingers formed on a piezoelectric substrate, and in which a plurality of SAW transmission spaces are included. The SAW transmission spaces do not have the function of exciting a SAW, and they have electric lengths which match the phases of SAWs excited by the resonator. In accordance with frequency characteristics required of the filter, such SAW transmission spaces are introduced into, for example, one of a plurality of SAW resonators located on the electric power input side of the filter.