基于相位梯度表面的缝隙阵列天线宽带RCS减缩

Wideband radar cross section reduction of slot antenna array with phase-gradient metasurface

提出了一种基于耶路撒冷十字单元的相位梯度表面,并将该表面加载到缝隙阵列天线表面.通过利用该表面将空间波(propagating wave,PW)转化为表面波(surface wave,SW)及奇异反射特性,天线可以在很宽的频带内实现显著的雷达散射截面(radar cross section reduction,RCS)减缩.与参考天线相比,设计天线在TE和TM两种极化波垂直和斜入射状态下均在6~18GHz频带范围内实现了单站RCS减缩,并且在9.5GHz处的最大减缩量达到20dB.与传统的天线RCS减缩技术相比,该方法可以在保证天线原本辐射性能的基础上同时实现天线带内和带外的RCS减缩.

A phase-gradient metasurface realized by the compact Jerusalem cross elements is proposed in this paper, which is loaded on the surface of the slot array antenna. By using its characteristics of converting propagating wave（PW） into surface wave（SW） and anomalous reflection, a remarkable monostatic radar cross section reduction（RCSR） can be obtained. Compared with the reference antenna, the monostatic RCS of the proposed antenna is reduced over a frequency range of 6-18 GHz for both normal and oblique incident waves with TE and TM polarizations, and the RCS of the proposed antenna can be reduced as much as 20 dB at around 9.5 GHz. Compared with the traditional RCSR methods, this technique can reduce both in-band and out-band RCSs of the slot array antenna, whose radiation performance is preserved at the same time.