一种采用可重构极化旋转表面的天线RCS减缩方法

针对天线的雷达截面减缩问题，提出了一种基于二极管控制的棋盘式分布可重构极化旋转表面，并将其用于准八木天线的雷达截面分时减缩方法．该方法考虑将可重构技术应用于极化旋转表面设计中，将可重构极化旋转表面用于置换准八木天线的金属反射板中，使得极化旋转表面反射板可以在金属特性反射板以及低雷达截面反射板之间相互切换．当二极管导通时，天线处于工作状态，可重构极化旋转表面反射板可当做一般金属板使用，则能够最大程度保留天线的辐射特性；当二极管截断时，天线处于非工作状态，可重构极化旋转表面反射板处于低雷达截面特性，可最大程度降低天线的带内雷达截面．仿真及实测结果表明，在工作状态时，天线的辐射特性几乎未发生变化；在非工作状态时，使用可重构极化旋转表面反射板，天线的单站雷达截面最大减缩量可达25dB以上，减缩角域可达-20°≤θ≤+20°．该方法可在保证准八木天线辐射特性的基础上最大程度地降低天线的雷达截面．

Method of antenna radar cross section reduction by the reconfigurable polarization rotation surface

A novel method for reducing the radar cross section (RCS) of a Yagi-uda antenna by reconfigurable polarization rotation surfaces (PRS) using chessboard-like geometry is proposed. The reconfigurable PRS reflector is able to be switched between low-RCS PRS reflector with OFF-state diodes and metal reflector with ON-state diodes. The reconfigurable PRS reflector with ON-state diodes is applied to a Yagi-uda antenna reflector and gives equivalent radiation performance to Yagi-uda with a metal reflector. The PRS reflector with OFF-state diodes is used as a low RCS reflector by chessboard configuration. Meanwhile, the state of RCS reduction can be switched according to the work state of radar between operating and non-operating. It is shown that the reconfigurable PRS reflector can contribute to the switchable RCS reduction between operating and non-operating of Yagi-uda. The radiation performance of the Yagi-uda antenna is preserved when reconfigurable PRS is used. The largest RCS reduction is more than 25dB, and the RCS reduction region is -20°≤θ≤+20°.