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    Surface acoustic wave device
    1.
    发明授权
    Surface acoustic wave device 有权
    表面声波装置

    公开(公告)号：US07019435B2

    公开(公告)日：2006-03-28

    申请号：US10812026

    申请日：2004-03-30

    申请人： Shinobu Nakaya ,  Hiroyuki Nakamura ,  Shigeru Tsuzuki

    发明人： Shinobu Nakaya ,  Hiroyuki Nakamura ,  Shigeru Tsuzuki

    IPC分类号： H03H9/64 ,  H03H9/145

    CPC分类号： H03H9/6433 ,  H03H9/0038 ,  H03H9/0071 ,  H03H9/02685 ,  H03H9/14588 ,  H03H9/643 ,  H03H9/6469 ,  H03H9/6473

    摘要： In a SAW device containing two or more longitudinal mode coupling type SAW elements connected in parallel, each SAW element includes at least three comb shaped electrode pairs and a reflector electrode provided at both sides of the comb shaped electrodes. One part of respective comb shaped electrode pairs forming IDT electrodes is connected together in common by a ground connection electrode and connected with a ground pad. This configuration enables the number of connection pads to be minimized, thus providing a SAW device that is small in size and superior in filter characteristics.

    摘要翻译： 在包含并联连接的两个或更多个纵向耦合型SAW元件的SAW器件中，每个SAW元件包括至少三个梳状电极对和设置在梳状电极两侧的反射器电极。 形成IDT电极的各个梳状电极对的一部分共同地由接地连接电极连接在一起，并与接地垫连接。 这种配置使连接焊盘的数量最小化，从而提供尺寸小且滤波器特性优异的SAW器件。

    Surface acoustic wave filter
    2.
    发明授权
    Surface acoustic wave filter 有权
    表面声波滤波器

    公开(公告)号：US06972643B2

    公开(公告)日：2005-12-06

    申请号：US10362903

    申请日：2002-06-26

    申请人： Akio Tsunekawa ,  Shunichi Seki ,  Shinobu Nakaya ,  Hiroyuki Nakamura ,  Toru Yamada

    发明人： Akio Tsunekawa ,  Shunichi Seki ,  Shinobu Nakaya ,  Hiroyuki Nakamura ,  Toru Yamada

    IPC分类号： H03H9/00 ,  H03H9/02 ,  H03H9/145 ,  H03H9/25 ,  H03H9/64

    CPC分类号： H03H9/6436 ,  H03H9/0028 ,  H03H9/0042 ,  H03H9/14582 ,  H03H9/25 ,  H03H9/643 ,  H03H9/6433

    摘要： A longitudinally coupled surface acoustic wave filter includes a first, second and third IDT electrodes and a first and second reflector electrodes on a piezoelectric substrate. The IDT electrodes each include a primary excitation region having λ/2 electrode finger pitches, where λ is the wavelength of a surface acoustic wave. The primary excitation region is phase-shifted by a certain amount in accordance with a desired passband frequency response. The IDT electrodes further include a plurality of secondary excitation regions each having electrode finger pitches different from the λ/2 pitches. All of the electrode finger pitches of the surface acoustic wave filter thus range from 0.8λ/2 to 1.2λ/2, so that a loss increase caused by discontinuity between the IDT electrodes is prevented.

    摘要翻译： 纵向耦合表面声波滤波器包括第一，第二和第三IDT电极以及压电基片上的第一和第二反射器电极。 IDT电极各自包括具有λ/ 2电极指间距的主激励区域，其中λ是表面声波的波长。 主激励区域根据期望的通带频率响应被相移一定量。 IDT电极还包括多个辅助激励区域，每个辅助激励区域具有不同于λ/ 2间距的电极指间距。 因此，表面声波滤波器的所有电极指间距从0.8λ/ 2到1.2λ/ 2，从而防止IDT电极之间的不连续性引起的损耗增加。

    Surface acoustic wave filter
    4.
    发明授权
    Surface acoustic wave filter 有权
    表面声波滤波器

    公开(公告)号：US06476691B1

    公开(公告)日：2002-11-05

    申请号：US09762025

    申请日：2001-04-06

    申请人： Shigeru Tsuzuki ,  Tsutomu Igaki ,  Ken Matsunami ,  Kazunori Nishimura ,  Hiroyuki Nakamura ,  Toru Yamada

    发明人： Shigeru Tsuzuki ,  Tsutomu Igaki ,  Ken Matsunami ,  Kazunori Nishimura ,  Hiroyuki Nakamura ,  Toru Yamada

    IPC分类号： H03H964

    CPC分类号： H03H9/6433 ,  H03H9/0076 ,  H03H9/02637 ,  H03H9/14505 ,  H03H9/14529 ,  H03H9/14538 ,  H03H9/14552

    摘要： A SAW filter comprising a piezoelectric substrate and at least two filter tracks formed on the substrate, each having at least two IDT electrodes for input and output. The two filter tracks have substantially the same phase within a pass band, while it is substantially inverse-phased outside the pass band. For realizing the above-described conditions, input IDT electrode of one filter track is connected in parallel with input IDT electrode of the other filter track, while output IDT electrode of one filter track is connected in parallel with output IDT electrode of the other filter track. Furthermore, frequency values of said two filter tracks substantially coincide at a point 3 dB lower from the peak transfer function value. Thus the above-configured SAW filter of the present invention is smaller in the overall size and offers a broad pass band and a steep attenuation characteristic.

    摘要翻译： 一种SAW滤波器，包括压电衬底和形成在衬底上的至少两个滤波器轨道，每个滤波器轨道具有用于输入和输出的至少两个IDT电极。 两个滤波器轨道在通带内具有基本上相同的相位，而在通带外部基本上是反相的。 为了实现上述条件，一个滤波器轨道的输入IDT电极并联连接到另一滤波器轨道的输入IDT电极，而一个滤波器轨道的输出IDT电极与另一滤波器轨迹的输出IDT电极并联连接 。 此外，所述两个滤波器轨道的频率值基本上与从峰值传递函数值降低3dB的点相重合。 因此，本发明的上述配置的SAW滤波器的总体尺寸较小，并且具有宽的通带和陡峭的衰减特性。

    Surface acoustic wave filter with first and second filter tracks and balanced or unbalanced terminals
    8.
    发明授权
    Surface acoustic wave filter with first and second filter tracks and balanced or unbalanced terminals 有权
    表面声波滤波器，具有第一和第二滤波器轨道以及平衡或非平衡端子

    公开(公告)号：US6104260A

    公开(公告)日：2000-08-15

    申请号：US216941

    申请日：1998-12-21

    申请人： Toru Yamada ,  Shigeru Tsuzuki ,  Hiroyuki Nakamura

    发明人： Toru Yamada ,  Shigeru Tsuzuki ,  Hiroyuki Nakamura

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

    CPC分类号： H03H9/6453 ,  H03H9/0042 ,  H03H9/6433 ,  H03H9/0285 ,  H03H9/14505 ,  H03H9/14526 ,  H03H9/643

    摘要： A surface acoustic wave filter. The filter includes two filter tracks which are parallel to each other. Each track has an input interdigital transducer, reflector and output interdigital transducer. This distance between the input transducer and output transducer is the same in both tracks. The distance between the output transducer and reflector is different in the two tracks. The electrical connection is in opposite phase in either the inputs or outputs, but not both. Electrode fingers are arranged in groups of two and have widths and spacings related to the wavelength.

    摘要翻译： 表面声波滤波器。 滤波器包括彼此平行的两个滤波器轨道。 每个轨道都有一个输入叉指式换能器，反射器和输出叉指式换能器。 输入传感器和输出传感器之间的距离在两条轨道上相同。 输出传感器和反射器之间的距离在两条轨道上是不同的。 电气连接在输入或输出端都处于相反的阶段，但不能同时进行。 电极指状物被布置成两组，并且具有与波长相关的宽度和间隔。