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覆盖L波段的宽带隐身雷达天线罩设计 认领
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作者 +2 位作者 卞博锐 刘晓春 刘少斌 《微波学报》 CSCD 北大核心 2019年第2期48-53,共6页
设计了一款极化和角度不敏感的宽带频选吸波体,在X波段实现了宽带透射窗口以及包含L波段在内的宽频带吸收。该频选吸波体采用频率选择表面与电磁超材料吸波体相结合的方式,通过级联加载多层耦合型频率选择表面和双层高阻表面完成总体结... 设计了一款极化和角度不敏感的宽带频选吸波体,在X波段实现了宽带透射窗口以及包含L波段在内的宽频带吸收。该频选吸波体采用频率选择表面与电磁超材料吸波体相结合的方式,通过级联加载多层耦合型频率选择表面和双层高阻表面完成总体结构设计。理论上,利用等效电路法对多层耦合型频率选择表面及整体结构展开分析,论证频选结构和频选吸波体的谐振机理。数值仿真结果显示,该频选吸波体可以实现8.1~11.7 GHz频段内的宽频带透射,以及1.18~4 GHz、15~18 GHz频段内的宽频带吸收,其中透射窗口的插入损耗不大于3 dB。将该频选吸波体作为平面雷达天线罩与微带天线相结合,分析天线的辐射性能和散射特性。研究结果显示,天线在工作频带内保持了良好的辐射性能,而在带外实现了RCS的有效缩减,达到了天线系统的隐身目的。 展开更多
关键词 频率选择表面 电磁超材料 宽带吸波器 等效电路分析 低雷达反射截面
Flexible broadband polarization converter based on metasurface at microwave band 认领
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作者 王奇 +4 位作者 徐岩 刘少斌 莫锦军 刘晓春 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第7期243-251,共9页
A flexible broadband linear polarization converter is proposed based on the metasurface operating at microwave band.To achieve bandwidth extension property, long and short metallic arc wires, as well as the metallic d... A flexible broadband linear polarization converter is proposed based on the metasurface operating at microwave band.To achieve bandwidth extension property, long and short metallic arc wires, as well as the metallic disks placed over a ground plane, are combined into the polarizer, which can generate three neighboring resonances.Due to the combination of the first two resonances and the optimized size and thickness of the unit cell, the polarization converter can have a weak incident angle dependence.Both simulated and measured results confirm that the average polarization conversion ratio is over 85% from 11.3 GHz to 20.2 GHz within a broad range of incident angle from 0°to 45°.Moreover, the proposed polarization converter based on flexible substrates can be applied for conformal design.The simulation and experiment results demonstrate that our designed polarizer still keeps high polarization conversion efficiency, even when it adheres to convex cylindrical surfaces.The periodic metallic structure of the designed polarizer has great potential application values in the microwave, terahertz, and optic regimes. 展开更多
关键词 POLARIZATION CONVERTER FLEXIBLE metasurface WIDE-ANGLE BROADBAND
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