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    Surface wave device balun resonator filters
    11.
    发明授权
    Surface wave device balun resonator filters 失效
    表面波装置平衡 - 不平衡转换谐振器滤波器

    公开(公告)号：US5896071A

    公开(公告)日：1999-04-20

    申请号：US856701

    申请日：1997-05-15

    Applicant: Ji-Dong Dai ,  Yufeng Xu ,  Thomas Philip Cameron

    Inventor： Ji-Dong Dai ,  Yufeng Xu ,  Thomas Philip Cameron

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

    CPC classification number: H03H9/0028 ,  H03H9/14505

    Abstract: A surface wave device comprises first and second SPUDT (single phase unidirectional transducer) resonator filters each comprising first and second transducers, which are preferably RSPUDTs (resonant SPUDTs), the resonator filters being the same except that one transducer of the second resonator filter is a mirror image of the corresponding transducer of the first resonator filter to provide a phase difference of 180.degree.. The surface wave device serves as a balun by having an unbalanced signal connection to the first transducers, and a balanced signal connection comprising signal connections to the second transducer of each of the first and second resonator filters. The resonator filters can be arranged side by side on a common piezoelectric substrate.

    Abstract translation: 表面波装置包括第一和第二SPUDT（单相单向换能器）谐振器滤波器，每个包括第一和第二换能器，其优选地是RSPUDT（谐振SPUDT），谐振器滤波器是相同的，除了第二谐振滤波器的一个换能器是 第一谐振滤波器的相应传感器的镜像，以提供180°的相位差。 表面波装置通过具有与第一换能器的不平衡信号连接而起平衡 - 不平衡变换器的作用，平衡信号连接包括与第一和第二谐振滤波器中的每一个的第二换能器的信号连接。 谐振器滤波器可以并排布置在公共压电基板上。

    MULTILAYERED CORE BOARD WITH ENHANCED NAIL-PULL STRENGTH
    13.
    发明申请
    MULTILAYERED CORE BOARD WITH ENHANCED NAIL-PULL STRENGTH 审中-公开
    多层核心板，具有增强的拉拔强度

    公开(公告)号：US20120207989A1

    公开(公告)日：2012-08-16

    申请号：US13335396

    申请日：2011-12-22

    Applicant: Yufeng XU ,  Renee WEINBERGER

    Inventor： Yufeng XU ,  Renee WEINBERGER

    IPC: B32B7/02 ,  B32B38/00 ,  B05D1/38

    CPC classification number: E04C2/043 ,  B32B7/02 ,  B32B13/08 ,  B32B13/14 ,  B32B2250/40 ,  B32B2607/00 ,  Y10T428/2495 ,  Y10T428/24992

    Abstract: Disclosed herein are multilayered core cementitious boards with increased nail-pull resistance. The boards can comprise two or more layers of cementitious compositions, where each layer can be a different density. Methods of making the multilayered core boards are also disclosed. The methods include having a layer of cementitious composition partially set prior to applying the next layer.

    Abstract translation: 本文公开了具有增加的拔钉电阻的多层芯水泥板。 板可以包括两层或更多层水泥组合物，其中每层可以具有不同的密度。 还公开了制造多层芯板的方法。 所述方法包括在施加下一层之前部分地设置一层水泥组合物。

    BUTLER MATRIX IMPLEMENTATION
    14.
    发明申请
    BUTLER MATRIX IMPLEMENTATION 审中-公开
    BUTLER矩阵实现

    公开(公告)号：US20080143601A1

    公开(公告)日：2008-06-19

    申请号：US11946979

    申请日：2007-11-29

    Applicant: Yufeng Xu

    Inventor： Yufeng Xu

    IPC: H01Q3/00

    CPC classification number: H01Q3/40 ,  H01Q25/00

    Abstract: A novel implementation of a planar 4×4 RF Butler matrix layout is disclosed that permits, by moving the beam ports to the interior of the layout, for combining beam ports that are not disposed on the same side of the layout without the imposition of long delay times or crossover points. The implementation admits of using microstrip and/or stripline technologies.

    Abstract translation: 公开了一种平面4x4 RF Butler矩阵布局的新颖实现，其允许通过将波束端口移动到布局的内部，用于组合未布置在布局的同一侧上的波束端口，而不施加长的延迟时间 或交叉点。 实施允许使用微带线和/或带状线技术。

    Tunable optical filter and optical modulator
    17.
    发明授权
    Tunable optical filter and optical modulator 有权
    可调光滤波器和光调制器

    公开(公告)号：US06396632B1

    公开(公告)日：2002-05-28

    申请号：US09625175

    申请日：2000-07-25

    Applicant: Wen Liu ,  Yufeng Xu

    Inventor： Wen Liu ,  Yufeng Xu

    IPC: G02B2700

    CPC classification number: G02B5/20

    Abstract: A tunable optical filter is based on a conventional thin film optical filter. The thickness of the thin film optical filter determines the optical properties of the filter, specifically the pass band. The thin film optical filter is arranged within a hole extending through a layer of piezoelectric material such that the periphery of the thin film optical filter is secured to the periphery of the hole. Electrodes are provided on opposite surfaces of the piezoelectric layer such that different voltage levels can be applied. The resulting deformation of the piezoelectric layer causes a difference in the thickness of the thin film optical filter thereby permitting tuning of the optical filter.

    Abstract translation: 可调谐滤光器基于传统的薄膜滤光器。 薄膜光学滤波器的厚度确定滤光片的光学特性，特别是通带。 薄膜滤光器布置在延伸穿过压电材料层的孔中，使得薄膜滤光器的周边固定到孔的周边。 电极设置在压电层的相对表面上，使得可以施加不同的电压电平。 由此导致的压电层的变形导致薄膜滤光器的厚度差异，从而允许调整滤光器。

    Cascaded surface wave device filters providing balanced and unbalanced signal connections
    19.
    发明授权
    Cascaded surface wave device filters providing balanced and unbalanced signal connections 失效
    级联表面波器件滤波器提供平衡和不平衡的信号连接

    公开(公告)号：US5790000A

    公开(公告)日：1998-08-04

    申请号：US659396

    申请日：1996-06-06

    Applicant: Ji-Dong Dai ,  Yufeng Xu ,  John Choo Beng Saw ,  Zhuo-Hui Chen

    Inventor： Ji-Dong Dai ,  Yufeng Xu ,  John Choo Beng Saw ,  Zhuo-Hui Chen

    IPC: H03H9/00 ,  H03H9/25 ,  H03H9/64

    CPC classification number: H03H9/6469 ,  H03H9/0038 ,  H03H9/0042 ,  H03H9/0057 ,  H03H9/14588 ,  H03H9/25 ,  H03H9/6433 ,  H03H9/6459 ,  H03H9/6463

    Abstract: A cascaded surface wave device filter comprises two 2-pole surface wave device filters connected in cascade. The 2-pole filters each provide a balun function between balanced and unbalanced signal connections, and have either their unbalanced or their balanced signal connections interconnected in the cascade to reduce electromagnetic feedthrough and improve spurious mode suppression. The 2-pole filters are conveniently longitudinally coupled double mode surface wave resonators which are described, or transversely coupled double mode surface wave resonators. Higher order filters can be provided by connecting further 2-pole filters in the cascade. The cascaded filter is particularly useful for filtering at radio and intermediate frequencies in cellular radio equipment.

    Abstract translation: 级联表面波器件滤波器包括两个串联连接的两极表面波器件滤波器。 两极滤波器在平衡和不平衡信号连接之间提供平衡 - 不平衡转换功能，并且它们的不平衡或平衡信号连接在级联中互连，以减少电磁馈通并改善杂散模式抑制。 2极滤波器是方便的纵向耦合双模式表面波谐振器，其描述或横向耦合双模式表面波谐振器。 可以通过连接级联中的另外2极滤波器来提供高阶滤波器。 级联滤波器对于在蜂窝无线电设备中的无线电和中频进行滤波特别有用。

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