Information and Navigation College, Air Force Engineering University, Xi'an 710077, China.
Science and Technology on Electronic Information Control Laboratory, Chendu 610036, China.
Sci Rep. 2016 Nov 22;5:37409. doi: 10.1038/srep37409.
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.
我们提出了一种基于偏振转换器控制散射电磁场的超宽带反射超材料。偏振转换器的单元由三层具有双金属分裂环结构的基底和一个金属接地板组成。所提出的偏振转换器和旋转角度为 90°的偏振转换器分别作为“0”和“1”元件被用于设计数字反射超材料。“0”和“1”元件的数量是根据信息熵理论选择的。然后，通过遗传优化算法选择了优化的组合格式。由于相位和幅度的控制，通过所提出的偏振转换器，散射电磁场发生了破坏性干扰，从而实现了对其的操控。模拟和实验结果表明，对于正入射和斜入射，反射超材料在超宽带频率范围内表现出显著的雷达散射截面（RCS）减少。
