In this research, a highly efficient single‐layer reflective polarization converter based on anisotropic metasurface is proposed for microwave communications. The periodic design works in a dual‐operation mode as a half‐wave plate (cross‐polarizer) and a quarter‐wave plate (circular‐polarizer) over multiple frequency bands. The unit‐cell is comprised of coupled D‐shaped resonators printed on a low‐cost FR‐4 substrate offering cross‐polarization conversion (above −3 dB) over three frequency bands (6.45–6.87, 9.94–11.34, and 15.99–18.60 GHz) with cross conversion efficiency higher than 90%. Moreover, the proposed metasurface can also work as a linear to circular polarizer over three bands (6.0–6.25, 7.35–9.05, and 12.28–15.18 GHz). The design is further shown to be angularly stable for incidence angles up to 30°. The proposed design has been validated experimentally after fabrication.

中文翻译：

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高效，低成本的反射各向异性超表面，用于线性到线性交叉极化和圆极化转换

在这项研究中，提出了一种基于各向异性超表面的高效单层反射偏振转换器，用于微波通信。周期性设计以双工作模式工作，在多个频带上作为半波片（交叉偏振器）和四分之一波片（圆偏振器）工作。单元电池由印刷在低成本FR-4基板上的耦合D形谐振器组成，可在三个频段（6.45-6.87、9.94--11.34和15.99-18.60）上提供交叉极化转换（−3 dB以上） GHz），交叉转换效率高于90％。此外，建议的超颖表面还可以在三个频段（6.0–6.25、7.35-9.05和12.28–15.18 GHz）上用作线性到圆偏振器。进一步表明，该设计在入射角高达30°时在角度上稳定。