光学
极化(电化学)
雷达截面
散射
电介质
二进制数
宽带
物理
宽带
材料科学
光电子学
数学
化学
算术
物理化学
作者
Mohammad Akbari,Fereshteh Samadi,Abdel-Razik Sebak,Tayeb A. Denidni
出处
期刊:IEEE Antennas and Propagation Magazine
[Institute of Electrical and Electronics Engineers]
日期:2019-04-01
卷期号:61 (2): 40-52
被引量:57
标识
DOI:10.1109/map.2019.2896218
摘要
In this article, a wideband metasurface for radar cross-section (RCS) reduction based on a polarization conversion is presented. The unit cell is composed of a two-layer metasurface based on frequency-selective surfaces (FSSs) backed by a thin-grounded dielectric substrate. The metasurface is able to rotate the polarization by 90° using special binary elements "0" and "1" in combination. The elements are arranged using a binary coding matrix formed by a group search optimization (GSO) algorithm. The optimized arrangement resulted in the distribution of scattered electromagnetic (EM) waves and suppression of the maximum bistatic RCS of the metasurface over a broadband of incident angles for both polarizations. Additionally, a polarization conversion ratio (PCR) of nearly 131% with an efficiency higher than 90% is achieved. The reflective two-layer metasurface is designed in such a way to generate a reflection phase difference of 180° between elements 0 and 1 on a broad frequency band. A theoretical analysis is performed on the ratio of the 0 and 1 elements using the least square error (LSE) method to find the best ratio value. The simulated and experimental results show that the structure can significantly reduce the RCS by 10 dB over a wide frequency range from 5.1 to 22.1 GHz (125%) at the normal incidence for both polarizations.
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