一种超宽带反射型极化转换超表面设计

A Design of Ultra-Broadband Reflective Polarization Conversion Meta-Surface

提出了一种超宽带、反射型极化转换超表面,该极化转换超表面由"H"形周期金属贴片结构,介质板和金属底板组成。通过改变单元结构尺寸,可以使反射波2种交叉线极化分量的幅度相同,相位差接近±π/2。仿真与实测结果表明,该极化变换超表面在6.40~15.40GHz,17.49~18.14GHz频带内能将线极化入射波转换为轴比小于3dB的圆极化反射波;在15.81~17.26GHz频带内能将线极化入射波转换为极化转化率大于80%的交叉线极化反射波。该结构具有单元尺寸小,工作频带宽,能量损耗低的特点,可以在有限的平面内加载更多的单元结构。该极化变换超表面在电磁波调控、新型天线设计等方面具有一定的应用价值。

This paper proposes a design of ultra-broadband reflective polarization convension meta-surface composed of the shape of＂H＂metallic periodic structure,a layer dielectric and a metallic plate ground.Almost an equal magnitude and a 90°phase difference generated between the two orthogonal electric components of the reflected waves can be reached by changing the size of the meta-surface cell.The simulation and measurement show that this device can allow linear to convert circular polarization from 6.40 GHz to15.40 GHz and 17.49 GHz to 18.14 GHz,while the axis ratio is less than 3 dB.This can also realize more than 80% polarization conversion ratio from 15.81 GHz to 17.26 GHz under both x-and y-polarized incidence.The proposed polarization convension is characterized by a compact structure and simple geometry,a low loss to energy in ultra-broadband,using more unit cell in the available space.This design is of great value to electromagnetic control and design of new antennas.