In this paper, an ultra-wideband circular polarization (CP) maintaining reflector is proposed based on an anisotropic metasurface, which is an orthogonal anisotropic structure with a pair of symmetrical axes u and v perpendicular to each other. The simulated results show that the reflector can realized CP-maintaining reflection under both right-handed and left-handed CP (RHCP and LHCP) incidences in the frequency band between 8.79 and 27.09 GHz, the fractional bandwidth is up to 102%. In addition, the physical mechanism of the CP-maintaining reflection has been analyzed in detail, and one useful formula has been derived, which can be used to calculate the cross- and co-polarization reflection coefficients under CP incidence according to the phase differences between the two reflection coefficients under u and v-polarized incidences. Finally, one effective experimental validation was carried out.

中文翻译：

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由各向异性超表面实现的超宽带圆保偏反射

在本文中，提出了一种基于各向异性超表面的超宽带圆偏振（CP）保持反射器，该超表面是具有一对相互垂直的对称轴 u 和 v 的正交各向异性结构。仿真结果表明，该反射器在8.79~27.09 GHz频段的左右手CP（RHCP和LHCP）入射下均能实现保CP反射，分数带宽高达102%。此外，详细分析了CP保持反射的物理机制，推导出了一个有用的公式，可用于根据CP入射下的相位差计算交叉和共偏振反射系数。 u 和 v 偏振入射下的两个反射系数。最后，