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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。
A broadband low-radar cross-section microstrip antenna is designed. By periodically etching the periodic surface around the ground plane of the microstrip antenna, the FSS exhibits the band-stop characteristic and maintains the original antenna radiation characteristics. Outside the band, the FSS exhibits a bandpass characteristic, and incoming electromagnetic waves will pass through the antenna to reduce the antenna’s out-of-band RCS. In order to further reduce the RCS of the antenna, the RCS at the high frequency part of the antenna is further reduced by adding a square of the reflection phase by etching the periodic square chip on the bottom of the dielectric plate. Simulation and experimental results show that compared with the original antenna, the out-of-band RCS of the antenna is effectively reduced by loading the FSS square ring and the square patch, and the radiation characteristics of the antenna are well maintained.