A circular-polarized metal-only reflectarray operating at 20 GHz is reported in this article. The reflectarray uses a novel multi-slot element that supports both left-hand and right-hand circular polarization for applications such as satellite communication. The element maintains a full phase coverage of 360° for both polarizations over a wide bandwidth spanning from 18 to 24 GHz (30%). Moreover, the square slot of the element allows the antenna to maintain a low axial ratio (< 2 dB) over a large bandwidth. As a result, the 3-dB axial ratio bandwidth far exceeds the 1 and 3 dB gain bandwidths. The maximum simulated loss introduced by the reflectarray element was 0.9 dB at 24 GHz. The measured gain of the fabricated $20\lambda _{0}$ diameter (300 mm) reflectarray was 31.4 dB with a 1 and 3 dB gain-bandwidth of 6.8% and 10.1%, respectively, for each polarization. Measurement results illustrate excellent agreement with simulation. This reflectarray, which supports both polarizations, has both a polarization diversity and an increased bandwidth for satellite applications.

中文翻译：

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具有多槽元件的圆偏振金属反射阵列

本文报道了一种工作频率为 20 GHz 的圆极化金属反射阵列。反射阵列使用新颖的多槽元件，支持左旋和右旋圆极化，适用于卫星通信等应用。该元件在 18 至 24 GHz (30%) 的宽带宽内为两种极化保持 360° 的全相位覆盖。此外，元件的方形槽允许天线在大带宽上保持低轴比 (< 2 dB)。因此，3-dB 轴比带宽远远超过 1 和 3dB 增益带宽。反射阵列元件引入的最大模拟损耗在 24 GHz 时为 0.9 dB。制造的 $20\lambda_{0}$ 直径（300 mm）反射阵列的测量增益为 31.4 dB，1 dB 和 3 dB 增益带宽分别为 6.8% 和 10.1%，对于每个极化。测量结果与模拟非常吻合。这种支持两种极化的反射阵列具有极化分集和增加的卫星应用带宽。