一种宽带低雷达散射截面微带天线设计

A New Design for Wideband Low RCS Microstrip Antenna

设计了一种宽带低雷达散射截面微带天线,通过在微带天线接地板周围刻蚀周期性频率选择表面,在天线工作频带内,FSS呈现带阻特性,保持原始天线辐射特性,在天线工作频带外,FSS呈现带通特性,入射电磁波将穿过天线从而减缩天线带外RCS。为进一步减缩天线RCS,通过在介质板底面刻蚀周期性方形贴片,增加一个反射相位零点,从而进一步减缩天线高频部分的RCS。仿真和实测结果表明,与原始天线相比,通过加载FSS方环和方形贴片,天线的带外RCS得到有效减缩,天线辐射特性得到很好保持。

In this paper, a new design for wideband low RCS microstrip antenna is proposed.The band-stop frequency selective surface(FSS) is designed at the operating frequency of the antenna to replace the metallic ground of the antenna so that the out-of-band RCS of the proposed antenna can be reduced while maintaining the gain performance.Furthermore, four square metallic patches printed periodically below the cells of the FSS are utilized to add a new zero degree reflection phase in th e desired frequency range to enhance the bandwidth of RCS reduction.As a result, a wideband RCS reduction can be dramatically achieved out of antenna operating frequency band.The simulated and measured results both show that compared with the original antenna the RCS can be significantly reduced over a wide frequency range while maintaining the radiation performance.