Ultra-broadband Reflective Metamaterial with RCS Reduction based on Polarization Convertor, Information Entropy Theory and Genetic Optimization Algorithm.
Ultra-broadband Reflective Metamaterial with RCS Reduction based on Polarization Convertor, Information Entropy Theory and Genetic Optimization Algorithm.
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基于偏振转换器、信息熵理论和遗传优化算法的RCS降低超宽带反射超材料
DOI：
10.1038/srep37409
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发表时间：
2016-11-22
影响因子：
4.6
通讯作者：
Zhao Y
中科院分区：
文献类型：
--
作者：
Li SJ;Cao XY;Xu LM;Zhou LJ;Yang HH;Han JF;Zhang Z;Zhang D;Liu X;Zhang C;Zheng YJ;Zhao Y
提出了一种基于偏振变换器的超宽带反射材料，该材料具有控制散射电磁场的功能。该偏振变换器的单元电池由三层双金属劈环结构衬底和金属接地面组成。采用所提出的偏振变换器和旋转角度为90°的偏振变换器作为“0”和“1”单元设计了数字反射超材料。根据信息熵理论选择“0”和“1”元素的个数。然后，采用遗传优化算法选择优化后的组合格式。极化变换器的相位和幅值控制是导致散射电磁场受到干扰的主要原因。模拟和实验结果表明，在超宽频带内，反射材料在正入射和斜入射下均表现出显著的RCS降低。
We proposed an ultra-broadband reflective metamaterial with controlling the scattering electromagnetic fields based on a polarization convertor. The unit cell of the polarization convertor was composed of a three layers substrate with double metallic split-rings structure and a metal ground plane. The proposed polarization convertor and that with rotation angle of 90 deg had been employed as the “0” and “1” elements to design the digital reflective metamaterial. The numbers of the “0” and “1” elements were chosen based on the information entropy theory. Then, the optimized combinational format was selected by genetic optimization algorithm. The scattering electromagnetic fields had been manipulated due to destructive interference, which was attributed to the control of phase and amplitude by the proposed polarization convertor. Simulated and experimental results indicated that the reflective metamaterial exhibited significantly RCS reduction in an ultra-broad frequency band for both normal and oblique incidences.
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