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1. 发明授权

US3990080A Antenna with echo cancelling elements 失效
标题翻译：具有回波消除元件的天线
公开(公告)号：US3990080A
公开(公告)日：1976-11-02
申请号：US597368
申请日：1975-07-21
申请人： Carl William Lundgren, Jr. , George Walter Travis
发明人： Carl William Lundgren, Jr. , George Walter Travis
IPC分类号： H01Q19/02 , H01Q19/14
CPC分类号： H01Q19/025
摘要： Improvements are made in a dual frequency echo cancelling assembly for mounting in a hole in the subreflector of a Cassegrainian antenna. Subreflector echo returned to the feed system is cancelled in two frequency ranges by a reflection from the echo cancelling assembly which includes a flat plate, a guard ring surrounding the plate, and a conductive grid between the plate and the feed system. The improvements include wide, thin grid conductors electrically connected to the guard ring and a ring of reflective or absorptive material surrounding the guard ring to cover the subreflector hole edge. When the improved assembly is adjusted for best performance, a stronger reflection in the direction of the feed system is obtained for echo cancelling without sharp resonance peaks. The required diameter for the improved dual frequency echo cancelling assembly is smaller, minimizing blockage of the subreflector and undesirable scattering.
摘要翻译：在双频回波消除组件中进行改进，用于安装在卡塞格兰天线的子反射器的孔中。通过来自回波消除组件的反射在两个频率范围内返回到馈送系统的子反射器回波被消除，该回波消除组件包括平板，围绕板的保护环和板与馈电系统之间的导电栅格。这些改进包括电连接到保护环的宽的细格栅导体和围绕保护环的反射或吸收材料的环以覆盖副反射器孔边缘。当改进的组件被调整以获得最佳性能时，在进给系统的方向上获得更强的反射，用于没有尖锐共振峰值的回波消除。改进的双频回波消除组件的所需直径较小，使得次反射器的阻塞最小化和不期望的散射。

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