Gao Ju, Zhang Yiming, Sun Yang, Wu Qiang
Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China.
Materials (Basel). 2019 Nov 22;12(23):3857. doi: 10.3390/ma12233857.
Polarization has always been an important issue in modern communication systems, especially in sensitive measurements. Conventional polarization converters show limited applications due to their large size and narrow bandwidth. In this paper, we demonstrate an ultra-wide band, multifunctional, and highly efficient metamaterial-based polarization converter that is capable of converting a linearly polarized wave into its cross-polarized wave and circularly polarized wave over different frequency bands. The design principle is based on the field transformation theory and the anisotropic plate is made with high/low permittivity strip metamaterials. The simulation results show that the metamaterial-based polarization converter is able to achieve linear-to-linear conversion over 11.5-12.6 GHz, and linear-to-circular conversion over two frequency bands, 3.0-11.5 GHz and 12.6-17.0 GHz, with an average polarization conversion efficiency over 90%. The polarization converter proposed in this paper provides an important stepping stone for future communication systems' polarization control and can also be extended to higher frequency bands.
极化一直是现代通信系统中的一个重要问题，尤其是在敏感测量中。传统的极化转换器由于尺寸大、带宽窄，应用受到限制。在本文中，我们展示了一种基于超材料的超宽带、多功能且高效的极化转换器，它能够在不同频段将线极化波转换为其交叉极化波和圆极化波。设计原理基于场变换理论，各向异性平板由高/低介电常数带状超材料制成。仿真结果表明，基于超材料的极化转换器能够在11.5 - 12.6GHz实现线性到线性的转换，在3.0 - 11.5GHz和12.6 - 17.0GHz两个频段实现线性到圆极化的转换，平均极化转换效率超过90%。本文提出的极化转换器为未来通信系统的极化控制提供了重要的基石，并且还可以扩展到更高频段。
