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设计了一种同时具备高增益和宽带低散射特征的波导缝隙天线.将蚀刻有互补开口谐振环的方形贴片人工磁导体正交布阵得到宽带低雷达截面积(RCS)反射屏并以之代替原天线的全金属反射板,通过优化反射屏的加载方式,在展宽天线工作频带、提高天线增益的同时,实现了宽频域范围内天线鼻锥方向RCS减缩.实测结果表明:加载低RCS反射屏的缝隙天线工作带宽增加了100 MHz,前向增益提高了3.2 dB,在5.52—6.63GHz范围内RCS减缩量达10 dB以上,减缩带宽达到20%.
A waveguide slot antenna with both high gain and wideband low-scattering characteristics is designed, and a rectangular low-profile RCS reflective screen is obtained by orthogonal array of rectangular patch artificial magnetic conductors etched with complementary open-loop resonators. Instead of the all-metal reflector of the original antenna, the RCS of the antenna in the wide frequency range is reduced while broadening the working frequency band of the antenna and increasing the antenna gain by optimizing the loading mode of the reflector. The measured results show that: The working bandwidth of the slot antenna of the screen is increased by 100 MHz and the forward gain is increased by 3.2 dB. The reduction of RCS is more than 10 dB in the range of 5.52-6.63 GHz, and the reduction bandwidth is up to 20%.