Ultra-broadband and high-efficiency reflective linear polarization convertor based on planar anisotropic metamaterial in microwave region
Ultra-broadband and high-efficiency reflective linear polarization convertor based on planar anisotropic metamaterial in microwave region
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DOI：
10.1016/j.ijleo.2017.02.006
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发表时间：
2017-05
期刊：
影响因子：
3.1
通讯作者：
J. C. Zhao;Yongzhi Cheng
中科院分区：
文献类型：
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作者：
J. C. Zhao;Yongzhi Cheng
本文介绍了一种微波波段超宽带、高效率的90°旋转反射式线偏振镜的简单设计。该结构由平面各向异性超材料（MM）使用切割线（CW）结构形成。入射波在电场和磁场作用下产生三种谐振模式，导致交叉极化反射带宽极大扩展。仿真结果表明，线偏振波经反射后可以转换为正交偏振波，在5.1- 12.1GHz频率范围内，偏振转换比大于90%，相对带宽达78.6%，与实验结果吻合较好。仿真和实验结果均表明，在上述频率范围内，反射后的线偏振转换可达90°，且偏振纯度高，椭圆率η和偏振旋转方位角θ可证实这一点。所设计的用于构建薄MM板的结构在工作中心频率处评估为约λ0/8.72。它在高性能偏振控制中具有应用价值。
A simple design of an ultra-broadband and high-efficiency reflective linear polarization convertor with 90° rotation is presented in the microwave region. This convertor is formed from the planar anisotropic metamaterial (MM) using cut-wire (CW) structure. Three resonance modes are generated by electric and magnetic fields of incident wave, which lead to bandwidth expansion extremely of cross-polarization reflection. The simulation result shows that a linearly polarized wave can be converted into its orthogonal polarization after reflection, the polarization conversion ratio is above 90% in the frequency range of 5.1–12.1 GHz and the relative bandwidth is up to 78.6%, which agree well with the experimental results. Both simulation and experiment results demonstrate the capability of linear polarization conversion by 90°with high polarization purity after reflection in the above frequency range, which can be confirmed by ellipticityηand the polarization rotation azimuth angleθ. The designed structure that utilized to build the thin MM slab is about λ0/8.72 evaluated at operating center frequency. It has application values in polarization control with high performances.