In this article, a new compact metasurface circularly polarized (CP) antenna is presented, where the rotating 45° periodic ellipse patch is used to achieve polarization conversion from linearly polarized to CP. The meta‐surface is composed of 4 × 4 ellipse patches with 45° rotation, which are etched on the top layer of upper substrate. A slot ground plane and a coplanar waveguide structure are printed on both sides of bottom substrate, and the bottom substrate is directly connected to the upper substrate, which can make the antenna profile lower. As demonstrated in this article, the presented antennas have good characteristics of excellent 3‐dB axial ratio bandwidth of 17.4% (5.25‐6.25 GHz), and wide 10‐dB impedance bandwidth of 20.6% (5.0‐6.15 GHz).

中文翻译：

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紧凑型宽带CP超表面天线的设计

在本文中，提出了一种新的紧凑型超表面圆极化（CP）天线，其中使用旋转45°周期性椭圆形贴片来实现从线性极化到CP的极化转换。元表面由4个×4的椭圆形贴片组成，它们旋转45°，并在上基板的顶层上蚀刻。缝隙接地平面和共面波导结构印刷在底部基板的两侧，并且底部基板直接连接到上部基板，这可以降低天线轮廓。如本文所示，所展示的天线具有良好的特性，其出色的3dB轴向比率带宽为17.4％（5.25-6.25 GHz），宽10dB的阻抗带宽为20.6％（5.0-6.15 GHz）。