Wideband and Multi-band Circular Polarization Conversion Metasurfaces

2020 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) Pub Date : 2020-07-01 DOI:10.1109/IMWS-AMP49156.2020.9199656

H. B. Wang, Y. J. Cheng

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Abstract

Circular polarization conversion metasurfaces (CPCMs) can convert an incident linearly-polarized (LP) wave into an transmitted circularly-polarized (CP) wave, which are widely used in CP antenna designs. Compared to the conversional CP antennas, the CPCMs combined with LP antennas are easily achieved, without complicated feeding structures. The existing CPCMs have narrow bandwidths or low incident angle stability. In this presentation, a wideband and wide-angle CPCM based on a single-layer dielectric substrate will be proposed, whose bandwidth can cover the operation band of the K-/Ka-band satellite communications. After that, a dual-band CPCM with the element consisted of connected Jerusalem crosses and “I”-type dipoles will be introduced, which shows wide axial ratio bandwidth in the K and Ka bands. Furthermore, the dual-band element can be improved by placing orthogonal polarization structures on different layers, making the small element size and the low cross-polarization level respectively. The modified dual-band element-based CPCM has the wide operation band and the high incident angle stability.

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宽带和多波段圆偏振转换超表面

圆极化转换超表面(cpcm)可以将入射线极化(LP)波转换成透射圆极化(CP)波，广泛应用于CP天线设计中。与转换CP天线相比，cpcm与LP天线相结合容易实现，无需复杂的馈电结构。现有的cpcm带宽较窄，入射角稳定性较低。本文提出了一种基于单层介质基板的宽带广角CPCM，其带宽可覆盖K / ka波段卫星通信的工作频带。在此基础上，引入由耶路撒冷十字和I型偶极子组成的双频CPCM，该元件在K和Ka波段具有较宽的轴比带宽。此外，通过在不同的层上放置正交极化结构，可以改进双带元件，使元件尺寸小，交叉极化能级低。改进的双频元基CPCM具有宽工作频带和高入射角稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2020 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

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