利用各向异性超表面实现X波段的线性与圆极化转换

Khan M Ismail, Khalid Zobaria, Tahir Farooq A

Department of Electrical Engineering, COMSATS University Islamabad, Attock Campus, Attock City, Pakistan.

Research Institute for Microwave and Millimeter-wave Studies, National University of Sciences and Technology (NUST), Islamabad, Pakistan.

Sci Rep. 2019 Mar 14;9(1):4552. doi: 10.1038/s41598-019-40793-2.

An ultrathin single-layer metasurface manifesting both linear cross-polarization conversion (CPC) and linear-to-circular polarization (LP-to-CP) conversion in X-band is presented in this research. The designed metasurface acts as a multifunctional metasurface achieving CPC over a fractional bandwidth of 31.6% (8-11 GHz) with more than 95% efficiency while linear-to-circular polarization conversion is realized over two frequency bands from 7.5-7.7 GHz and 11.5-11.9 GHz. Moreover, the overall optimized structure of the unit cell results in a stable polarization transformation against changes in the incidence angle up to 45° both for transverse-electric (TE) and transverse-magnetic (TM) polarizations. The proposed metasurface with simple structure, compact size, angular stability and multifunctional capability qualifies for many applications in communication and polarization manipulating devices.

本研究提出了一种超薄单层超表面，其在X波段同时表现出线性交叉极化转换（CPC）和线性到圆极化（LP-to-CP）转换。所设计的超表面作为一种多功能超表面，在31.6%（8-11 GHz）的分数带宽内实现了CPC，效率超过95%，同时在7.5-7.7 GHz和11.5-11.9 GHz两个频段实现了线性到圆极化转换。此外，单元胞的整体优化结构使得对于横向电（TE）和横向磁（TM）极化，在入射角高达45°的变化下仍能实现稳定的极化转换。所提出的超表面具有结构简单、尺寸紧凑、角度稳定性和多功能能力等特点，适用于通信和极化操纵设备中的许多应用。