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In this paper, a multi-band metasurface(MS) antenna array with low radar cross section(RCS) performance is proposed and measured. Firstly, a 44 antenna array is composed of four 22 Jerusalem cross structure antenna arrays working at different frequency bands, which is aimed at enhancing the bandwidth effectively. Then, each antenna can be seen as a unit of MS in spite of adding the feeding structure. Based on phase cancellation principle, the MS is arranged into a chessboard configuration in order to realize wideband RCS reduction. Thus, excellent radiation and scattering characteristics are obtained simultaneously. Simulated and measured results indicate that this work provides a novel method to achieve bandwidth expansion as well as wideband RCS reduction of the antenna array. 相似文献
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本文将电磁表面(electromagnetic surface, EMS)的设计思想引入到微带天线阵的设计中,在设计天线单元的同时,也将其作为EMS单元兼顾其反射特性.通过在矩形辐射贴片上开弧形缺口,得到一种新的单元结构,该单元可与原始EMS单元之间形成180°±30°有效相位差,且作为天线单元时与原始天线工作在相同谐振模式、相同频带.将两种单元以棋盘形式构成组合天线阵,在两个极化下分别基于相位对消原理和吸波原理实现了雷达散射截面(radar cross section, RCS)减缩.实测与仿真结果表明:相较于等大小的金属板,在x极化波照射下,天线阵在5.6—6.0 GHz实现了6 dB以上的RCS减缩,相对带宽为10.1%;在y极化波照射下,天线阵在5.0—7.2 GHz实现了6 dB以上的RCS减缩,相对带宽为24%.同时由于两种单元在辐射上具有较好的一致性,使得组合天线阵的辐射性能得以保持.该方法有效解决了天线阵辐射和散射难以兼顾的矛盾,为其他形式的低散射天线阵的设计提供了新的方法与思路. 相似文献
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