An elliptical chiral split-ring-resonator-based bilayer thin metasurface is introduced in this paper. The proposed metasurface realizes strong electromagnetic (EM) activity with asymmetric transmission in the K-band of the microwave regime. The efficiency is more than 80% over a range of frequencies from 18.6 to 20.8 GHz. Angular stability up to 60° makes the structure robust for practical applications. The structure also exhibits a negative refractive index for circularly polarized wave due to the strong chirality factor. Polarization azimuth rotation angle of 90° and ellipticity of 0° reveal the pure EM/optical activity. Furthermore, the simulation and measured results also affirmed orthogonal pure linear polarization transformation. The proposed chiral metasurface finds applications in radar and satellite belonging to K-band.

中文翻译：

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利用超薄手性超表面的光学活性实现高效的非对称传输，用于 K 波段应用

本文介绍了一种基于椭圆手性开环谐振器的双层薄超表面。拟议的超表面实现了强电磁 (EM) 活动，在微波区域的 K 波段具有不对称传输。在 18.6 至 20.8 GHz 的频率范围内，效率超过 80%。高达 60° 的角度稳定性使结构在实际应用中非常稳健。由于强手性因子，该结构还对圆偏振波表现出负折射率。90° 的偏振方位角旋转角和 0° 的椭圆率揭示了纯 EM/光学活动。此外，仿真和测量结果也证实了正交纯线性偏振变换。所提出的手性超表面在属于 K 波段的雷达和卫星中得到应用。