This paper proposes an aperture-coupled antenna with an ultrathin, single-layer metasurface for linear-to-circular (LP–CP) polarization conversion. The unit cell of the metasurface consists of a hexagonal ring surrounded by a square ring printed on both sides of a dielectric substrate for wideband LP-CP conversion. A patch antenna excited by an H-shaped slot aperture uses a 5 × 5 array of the metasurface as a superstrate. Simulated and measured radiation patterns of the proposed antenna are in good agreement. Measured S11 and axial ratio bandwidth of the proposed antenna are 21.5% and 19.23% respectively. Boresight radiation gain is around 10 dBic over 9.5 GHz to 11.5 GHz.

中文翻译：

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基于线圆极化转换超表面的宽带孔径耦合天线

本文提出了一种孔径耦合天线，具有用于线性到圆形 (LP-CP) 极化转换的超薄单层超表面。超表面的单位单元由一个六边形环组成，周围是一个方形环，印在介电基板的两侧，用于宽带 LP-CP 转换。由 H 形缝隙孔径激发的贴片天线使用 5 × 5 超表面阵列作为覆层。拟议天线的模拟和测量的辐射方向图非常一致。所建议天线的实测 S11 和轴比带宽分别为 21.5% 和 19.23%。在 9.5 GHz 至 11.5 GHz 范围内，视轴辐射增益约为 10 dBic。