Wide-angle, ultra-wideband, and polarization-insensitive circuit analog absorbers

被引：0
|
作者：
Yao Z. [1 ]
Xiao S. [1 ,2 ]
机构：
[1] School of Physics, UESTC, Chengdu
[2] School of Electronic and Information Engineering, Sun Yat sen University, Guangzhou
来源：
Xiao, Shaoqiu (xiaoshq8@mail.sysu.edu.cn) | 1600年 / Institute of Electronics Chinese Academy of Sciences卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Circuit analog absorber; Equivalent circuit; Oblique incidence; Square-loop frequency selective surface; Ultra-wideband and wide-angle absorption;
D O I：
10.12000/JR21017
中图分类号：
学科分类号：
摘要：
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. © 2021 Institute of Electronics Chinese Academy of Sciences. All rights reserved.
引用
收藏
页码：274 / 280
页数：6
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