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    • 22. 发明授权
    • Geodesic slotted cylindrical antenna
    • 大地测量开槽圆柱形天线
    • US6011520A
    • 2000-01-04
    • US25136
    • 1998-02-18
    • James M. HowellThomas E. Sharon
    • James M. HowellThomas E. Sharon
    • H01Q13/10H01Q13/12H01Q21/20
    • H01Q13/12H01Q13/10H01Q21/205
    • A geodesic slotted cylindrical (GSC) antenna having a shaped elevation pattern and a narrow or shaped azimuth beam that can be scanned 360.degree. in the azimuth plane. The azimuth radiation pattern of the GSC antenna can be reconfigured through the use of interchangeable beam forming feed networks. The GSC antenna comprises a parallel plate waveguide formed by spaced-apart inner and outer cylinders constructed from conductive material. Radiation occurs from a stack of circumferential slots in the outer cylinder. By varying the slot spacing with the azimuth angle, the elevation pattern can be altered as a function of the azimuth angle. The GSC antenna can be excited by a number of equally spaced probes on a circle at the base of the cylinders. The feed radius is typically smaller than the outer cylinder's radius to minimize the number of active components and to minimize the number of spurious ray paths that can wrap around inside the cylinder's parallel plate region. The probes can be phased so that rays from each probe will travel between the parallel cylindrical plates and radiate from the slots to produce a beam that is focused in azimuth. The elevation pattern can be scanned or altered by mechanically moving a tapered dielectric insert within the parallel plate region.
    • 具有成形仰角图形和窄或成形方位角的测地开槽圆柱形(GSC)天线,可在方位平面360°扫描。 可以通过使用可互换的波束形成馈电网络来重新配置GSC天线的方位角辐射图。 GSC天线包括由导电材料构成的间隔开的内和外圆筒形成的平行板波导。 辐射从外筒中的圆周槽的堆叠发生。 通过用方位角改变槽间距,仰角图可以作为方位角的函数而改变。 GSC天线可以由圆柱体底部的圆周上的多个等间隔的探头激发。 进料半径通常小于外筒的半径,以使活动部件的数量最小化,并使可绕圆筒平行板区域内的杂散射线路径的数量最小化。 探针可以被定相,使得来自每个探针的射线将在平行的圆柱形板之间行进并从狭槽辐射以产生聚焦在方位角的光束。 可以通过机械地移动平行板区域内的锥形电介质插入件来扫描或改变仰角图案。