姚智馨^1,,
肖绍球^{1, 2,,}
1.电子科技大学物理学院 成都 611731
2.中山大学电子与信息工程学院 广州 510275
基金项目:国家自然科学基金(61731005)，中央高校基础研究基金(ZYGX2016Z008)

详细信息

作者简介:姚智馨(1995–)，男，河南信阳人，电子科技大学博士研究生。主要研究方向为超材料、雷达吸波材料的理论与设计。E-mail: yaozhixin_1995@163.com
肖绍球(1975–)，男，湖南桑植人，博士，中山大学电子与信息工程学院教授。主要研究方向为面向无线通信、雷达系统的相控阵天线理论与技术、人体可穿戴、可植入式天线与器件、电波传播与无线通信和电磁散射调控及其应用。先后共发表学术论文280篇，其中被SCI收录130篇。E-mail: xiaoshq8@mail.sysu.edu.cn

通讯作者:肖绍球 xiaoshq8@mail.sysu.edu.cn

责任主编：李龙 Corresponding Editor: LI Long
中图分类号:O451

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出版历程

收稿日期:2021-03-01
修回日期:2021-04-13
网络出版日期:2021-04-23

Wide-angle, Ultra-wideband, and Polarization-insensitive Circuit Analog Absorbers

YAO Zhixin^1,,
XIAO Shaoqiu^{1, 2,,}
1. School of Physics, UESTC, Chengdu 611731, China
2. School of Electronic and Information Engineering, Sun Yat sen University, Guangzhou 510275, China
Funds:The National Natural Science Foundation of China (61731005), The Fundamental Research Funds for the Central Universities under Grant (ZYGX2016Z008)

More Information

Corresponding author:XIAO Shaoqiu, xiaoshq8@mail.sysu.edu.cn

摘要
摘要:传统的电路模拟吸波材料设计只考虑正入射时的吸波性能，当入射角较大，尤其是大于30°时，雷达吸波器的吸波效果明显恶化。随着现代双站雷达探测技术的发展，雷达探测电磁波可能来自不同的空间方向，这就要求雷达吸波材料不仅在电磁波正入射时具有较高的吸波性能，在斜入射时同样实现良好的隐身特性。为此，该文提出了一种新型的宽带吸波材料。该材料由嵌入集总电阻的导电方环阵列和设计良好的宽角阻抗匹配(WAIM)层组成。由于WAIM层的存在，斜入射情况下的吸波性能明显改善。同时，针对电磁波正斜入射情况，该文提出了准确的等效电路模型以及严格的数学计算模型，使得结构设计清晰明了。测量结果表明，正入射时的吸波带宽达到137.1%。当入射角小于45°时，所设计吸波材料在反射系数衰减至少10 dB情况下的公共百分比吸波带宽达到110.5%。等效电路模型计算、仿真与实测结果之间的相似性验证了该文设计的有效性。
关键词:电路模拟吸波材料/
方环频率选择表面/
等效电路/
斜入射/
宽带宽角吸波
Abstract:Most previous circuit analog absorbers only considered absorption performance under normal incidences, leading to bad absorption for large incident angles, particularly those > 30°. With the advancement in modern bistatic radar detection technology, radar electromagnetic waves may come from different spatial directions, thereby necessitating radar absorbers with high absorption performance under normal and oblique incidences. Thus, in this paper, we present a novel wideband absorber comprising a conductive square-loop array embedded with lumped resistors and a well-designed Wide-Angle Impedance Matching (WAIM) layer. Results show that the WAIM layer can significantly improve absorption under oblique incidences. To make the absorber design clear and simple, an Equivalent Circuit (EC) and strict calculating formulas are proposed under normal and oblique incidences. Fractional bandwidth is increased into 137.1% through measurement under normal incidence, and the structure has a common fractional bandwidth of at least 110.5% for at least 10 dB reflection reduction when the incidence angle < 45°. The similarity among EC calculated, simulated, and measured results proves the validity of the designed absorber.
Key words:Circuit analog absorber/
Square-loop frequency selective surface/
Equivalent circuit/
Oblique incidence/
Ultra-wideband and wide-angle absorption



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