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    • 2. 发明授权
      US08466370B2 Low index metamaterial 有权
    • Low index metamaterial
    • 低指数超材料
    • US08466370B2
    • 2013-06-18
    • US12564847
    • 2009-09-22
    • Erik Lier
    • Erik Lier
    • H05K1/00
    • H01Q15/0073 , H01Q13/02 , H01Q13/0275 , H01Q15/0086
    • Various aspects of the disclosure provide low index metamaterials. The low index metamaterials may be used to form soft and/or hard electromagnetic (EM) boundaries to facilitate desired EM performance or propagation in applications including feed horns, spatial feed/combiners, isolation barriers between antennas or RF modules, and reduced radar cross-section applications. In one aspect, a low index metamaterial comprises a dielectric layer and a plurality of conductors on a surface of the dielectric layer, embedded in the dielectric layer or both, wherein the low index metamaterial appears as a medium having a dielectric constant less than one with respect to electromagnetic waves at predetermined frequencies and propagating at grazing angles with respect to a surface of the low index metamaterial.
    • 本公开的各个方面提供了低指数超材料。 低指数超材料可用于形成软和/或硬电磁（EM）边界，以便在包括馈电喇叭，空间进给/组合器，天线或RF模块之间的隔离屏障以及降低的雷达交叉点的应用中促进期望的EM性能或传播， 截面应用。 在一个方面，低折射率超材料包括电介质层和介电层表面上的多个导体，嵌入介电层或二者中，其中低折射率超材料表现为介电常数小于1的介质， 相对于低折射率超材料的表面以预定频率的电磁波传播，并以放射角传播。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 5. 发明授权
      US2658186A Prismatic directional and object locating system 失效
    • Prismatic directional and object locating system
    • 棱镜方向和物体定位系统
    • US2658186A
    • 1953-11-03
    • US43439642
    • 1942-03-12
    • BELL TELEPHONE LABOR INC
    • MASON WARREN P
    • G01S1/72 , G01S7/54 , H01Q15/00
    • G01S7/521 , G01S15/42 , G01S15/876 , H01Q15/0073
    • 696,809. Acoustic directional apparatus. WESTERN ELECTRIC CO., Inc. Sept. 3, 1943 [March 12, 1942]. No. 14457/43. Class 118 (ii) [Also in Group XL(c)] A system for detecting or locating an object .such as a submerged submarine by the reception of compressional waves originating at or reflected from the object, or for detecting or locating an object such as an aircraft in flight by the reception of electro-magnetic waves reflected from the object (see Group XL(c)) includes a device directionally responsive in different directions to different frequencies and means to determine the frequency of the wave and hence its direction. When compressional waves are used both the transmitter (when used) and the receiver are "frequency directional" and the same apparatus may function as transmitter and receiver alternately; when electromagnetic waves are used either the transmitter or the receiver may be " frequency-directional." For compressional wave work the transmitter / receiver may be generally as described in Specification 592,255 which comprises a multiplicity of rows of piezoelectric crystals, the rows being separated from one another by a distance less than half of the minimum wave length to be used and successive rows are shunted across successive shunt arms of a multi-section electrical wave filter which passes the range of frequencies of interest. Such transmitter acts like a prism and spreads the range of frequencies like a spectrum and directs each particular frequency in a distinct direction; similarly the receiver may receive any given frequency from one direction only. Fig. 1 shows three transmitter/receivers 17, 19, 20, of which one is positioned in each side of a vessel and the third beneath the vessel, Figs. 3A and 3B (not shown). The output of one of the receivers is connected by a switch 18 to a filter 149, which excludes extraneous interfering frequencies, and a modulator 26 where it is combined with the output of a variable heterodyne 'oscillator 28 furnishing a heterodyne frequency varied periodically over a range of say 118/124 Kcs. so that any frequency received within the 18/24 Kc. range normally used in subaqueous transmission will produce a beatnote of 100 kcs. which is passed through a filter 32 and rectifier 34 to the control anode 38 of a cathode ray tube 85. The beam is deflected horizontally by a variable voltage from battery 22 through potentiometer 30 which voltage varies periodically with the frequency changes of oscillator 28. A scale 81 against the screen 36 gives the horizontal angle of reception. The receiver 20 beneath the vessel is rotatably mounted and a variable voltage is applied to the vertical deflecting plates of the cathode ray tube from a battery 43 and potentiometer 44 syncronously with the turning movement of receiver 20 so that the vertical angle of reception may be read on a scale 83. A second cathode ray tube may be provided to give a direct reading of distance Fig. 2 (not shown). In Fig. 4 several buoy systems may be installed in narrow channels, harbours etc.; each buoy supports two receivers of which one, 74 is directive in a horizontal plane the other, 72, in a vertical plane. Noise from the propeller of a submarine 70 picked up by one of more of the receivers is converted into low frequency current which is used to modulate carrier radio waves of distinctive frequencies emitted by small radio transmitters 82 and picked up by an attendant vessel 88. A transmitter/ receiver having frequency-directivity in both horizontal and vertical planes may be used, Fig. 5 (not shown).
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 8. 发明申请
      US20110012808A1 Broadband Convex Ground Planes for Multipath Rejection 有权
    • Broadband Convex Ground Planes for Multipath Rejection
    • 用于多路径拒绝的宽带凸面飞机
    • US20110012808A1
    • 2011-01-20
    • US12797035
    • 2010-06-09
    • Dmitry Tatarnikov , Andrey Astakhov , Anton Stepanenko
    • Dmitry Tatarnikov , Andrey Astakhov , Anton Stepanenko
    • H01Q1/48
    • H01Q15/16 , H01Q15/0073 , H01Q19/10
    • A ground plane for reducing multipath reception comprises a convex conducting surface and an array of conducting elements disposed on at least a portion of the convex conducting surface. Embodiments of the convex conducting surface include a portion of a sphere and a sphere. Each conducting element comprises an elongated body structure having a transverse dimension and a length, wherein the transverse dimension is substantially less than the length. The cross-section of the elongated body structure can have various user-specified shapes. Each conducting element can further comprise a tip structure. The azimuth spacings, lengths, and surface densities of the conducting elements can be functions of meridian angle. An antenna can be mounted directly on the conducting convex surface or on a conducting or dielectric support structure mounted on the conducting convex surface. System components, such as a navigation receiver, can be mounted inside the conducting convex surface.
    • 用于减少多路径接收的接地平面包括凸形导电表面和布置在凸形导电表面的至少一部分上的导电元件阵列。 凸形导电表面的实施例包括球体和球体的一部分。 每个导电元件包括​​具有横向尺寸和长度的细长主体结构，其中横向尺寸基本上小于该长度。 细长体结构的横截面可以具有各种用户指定的形状。 每个导电元件还可以包括尖端结构。 导电元件的方位角间距，长度和表面密度可以是子午角的函数。 天线可以直接安装在导电凸表面上或安装在导电凸表面上的导电或介电支撑结构上。 诸如导航接收器的系统组件可以安装在导电凸表面内。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
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