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    Surface wave devices with low passband ripple
    2.
    发明申请
    Surface wave devices with low passband ripple 失效
    具有低通带纹波的表面波器件

    公开(公告)号：US20040108917A1

    公开(公告)日：2004-06-10

    申请号：US10315134

    申请日：2002-12-10

    发明人： Chun-Yun Jian ,  Steve A. Beaudin ,  Somsack Sychaleun

    IPC分类号： H03H009/64

    CPC分类号： H03H9/6496 ,  H03H9/0042 ,  H03H9/02779 ,  H03H9/0285 ,  H03H9/02881 ,  H03H9/14547 ,  H03H9/14558 ,  H03H9/14567

    摘要： Very low passband ripple is provided in a wide bandwidth high frequency SAW FIR filter using slanted finger IDTs by one or more of three techniques: cancelling regenerated SAWs at parallel-connected input IDTs of two SAW filters which are similar except for a quarter-wavelength difference in spacing of the input and output IDTs, this difference varying with wavelength across the IDT aperture; shaping edges of shield electrodes to provide quarter-wavelength differences in, and hence cancellation of, SAWs reflected at the edges, the differences varying with wavelength across the IDT aperture; and making pairs of slanted shield electrodes symmetrical to compensate for refraction of SAWs by the shield electrodes.

    摘要翻译： 通过三种技术中的一种或多种的倾斜手指IDT，在宽带宽高频SAW FIR滤波器中提供非常低的通带纹波：在两个SAW滤波器的并联输入IDT之间取消再生SAW，除了四分之一波长差 在输入和输出IDT的间隔中，该差异随IDT孔径上的波长而变化; 形成屏蔽电极的边缘，以提供在边缘反射的SAW的四分之一波长差异并因此消除SAW，该差异随IDT孔径上的波长而变化; 并使成对的倾斜屏蔽电极对称以补偿由屏蔽电极引起的SAW的折射。

    Surface acoustic wave resonator and surface acoustic wave filter
    6.
    发明申请
    Surface acoustic wave resonator and surface acoustic wave filter 有权
    表面声波谐振器和表面声波滤波器

    公开(公告)号：US20030117240A1

    公开(公告)日：2003-06-26

    申请号：US10316089

    申请日：2002-12-11

    申请人： FUJITSU MEDIA DEVICES LIMITED

    发明人： Shogo Inoue ,  Jun Tsutsumi ,  Takashi Matsuda ,  Osamu Ikata

    IPC分类号： H03H009/64

    CPC分类号： H03H9/6436 ,  H03H9/14547 ,  H03H9/14567 ,  H03H9/1457 ,  H03H9/6483

    摘要： A surface acoustic wave resonator includes a piezoelectric substrate, and a SAW resonator having an interdigital transducer. The interdigital transducer satisfies 0.15LnullWnull0.45L where W is the total of widths of all electrode fingers that form the interdigital transducer, and L is a length of the said interdigital transducer in a direction of SAW propagation.

    摘要翻译： 声表面波谐振器包括压电基片和具有叉指式换能器的SAW谐振器。 叉指换能器满足0.15L <= W <= 0.45L，其中W是形成叉指换能器的所有电极指的总宽度，L是所述叉指换能器在SAW传播方向上的长度。

    Surface acoustic wave filter of multi-stage connection type
    7.
    发明授权
    Surface acoustic wave filter of multi-stage connection type 失效
    多级连接型表面声波滤波器

    公开(公告)号：US5999068A

    公开(公告)日：1999-12-07

    申请号：US041784

    申请日：1998-03-13

    申请人： Jun Tsutsumi ,  Osamu Ikata ,  Yoshio Satoh

    发明人： Jun Tsutsumi ,  Osamu Ikata ,  Yoshio Satoh

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

    CPC分类号： H03H9/6433 ,  H03H9/14567 ,  H03H9/1457 ,  H03H9/6459 ,  H03H9/6463 ,  H03H2250/00 ,  H03H9/14547

    摘要： A surface acoustic wave filter of multi-stage connection type including a plurality of surface acoustic wave filters formed on a piezoelectric substrate and a connection section for electrically connecting the surface acoustic wave filters in a cascade connection. Each of the surface acoustic wave filters includes interdigital transducers with two signal terminals for electric input and output, each interdigital transducer including an excitation section for exciting a surface acoustic wave and two terminal sections disposed on opposite sides of the excitation section, the two terminal sections serving as input or output terminal for electric signal and ground terminal. One of the signal terminal sections is connected to the connection section, and an electrode area of said one of the signal terminal sections is adjusted so that a parasitic capacitance formed between said one of the signal terminal sections and a grounding point of the surface acoustic wave filter is less than or equal to 0.01 pF.

    摘要翻译： 一种多级连接型表面声波滤波器，包括形成在压电基片上的多个声表面波滤波器和用于电连接级联连接声表面波滤波器的连接部分。 每个表面声波滤波器包括具有两个用于电输入和输出的信号端子的叉指式换能器，每个叉指式换能器包括用于激发表面声波的激励部分和设置在激励部分的相对侧上的两个端子部分，两个端子部分 作为电信号和接地端子的输入或输出端子。 信号端子部分中的一个连接到连接部分，并且调节所述信号端子部分中的一个的电极区域，使得在所述信号端子部分之间形成的寄生电容和表面声波的接地点 过滤器小于或等于0.01 pF。

    Surface acoustic wave device
    10.
    发明授权
    Surface acoustic wave device 失效
    表面声波装置

    公开(公告)号：US4697115A

    公开(公告)日：1987-09-29

    申请号：US785938

    申请日：1985-10-09

    申请人： Syuichi Mitsutsuka

    发明人： Syuichi Mitsutsuka

    IPC分类号： H03H3/08 ,  H03H9/02 ,  H03H9/145 ,  H03H9/64 ,  H01L41/08

    CPC分类号： H03H9/6403 ,  H03H9/14564 ,  H03H9/14567 ,  H03H9/423 ,  H03H9/72 ,  H03H2240/00 ,  H03H9/02629 ,  H03H9/14547

    摘要： A surface acoustic wave device includes a semiconductor substrate, a piezoelectric film disposed on the semiconductor substrate, at least one pair of comb-shaped electrodes constituting an input transducer, and an output transducer a plurality of surface acoustic wave filters having different bands, which include a plurality of metal electrodes, so disposed that each of them is located between the input and output comb-shaped electrodes of each of the surface acoustic wave filters, a bias voltage applying arrangement for applying bias voltages to each of the metal electrodes; and a bias voltage regulating arrangement for regulating the bias voltages.

    摘要翻译： 表面声波装置包括半导体衬底，设置在半导体衬底上的压电膜，构成输入变换器的至少一对梳状电极和具有不同带的多个表面声波滤波器的输出变换器，其包括 多个金属电极，其布置成使得它们中的每一个位于每个声表面波滤波器的输入和输出梳状电极之间;偏置电压施加装置，用于向每个金属电极施加偏置电压; 以及用于调节偏置电压的偏置电压调节装置。