ABSTRACT

An ultra-thin and ultra-wideband anisotropic metasurface, acting as a linear polarization converter through reflection is designed and simulated in this research. The operation frequency range covers almost completely the Ku-band and the entire K- and Ka-band. The unit cell of the proposed metasurface is composed of a arrangement of concentric square metallic loops on a grounded dielectric substrate, in which a diagonal split is made, providing properties of an anisotropic material. Simulation results show that an efficient cross-polarization conversion, both for normal as well as for oblique incidence, is achieved with $-10$ dB fractional bandwidth of 98.7% from 13.8 GHz to 40.7 GHz and with an average polarization conversion ratio of 97.5%. The ultra-wideband of the proposed structure results from multiple plasmonic resonances occurring at three neighboring frequencies (15.2 GHz, 25.9 GHz, and 38 GHz) resulting in a significant expansion of the operating frequency range.

摘要

本研究设计并模拟了超薄和超宽带各向异性超表面，通过反射充当线性偏振转换器。工作频率范围几乎完全覆盖了 Ku 波段以及整个 K 和 Ka 波段。所提出的超表面的晶胞由接地介电基板上的同心方形金属环排列组成，其中形成对角线分裂，提供各向异性材料的特性。仿真结果表明，对于垂直入射和斜入射都实现了有效的交叉偏振转换$-10$ 从 13.8 GHz 到 40.7 GHz 的 dB 分数带宽为 98.7%，平均极化转换率为 97.5%。所提出结构的超宽带源于在三个相邻频率（15.2 GHz、25.9 GHz 和 38 GHz）处发生的多个等离子体共振，从而导致工作频率范围的显着扩展。