A low-profile wideband dual-polarized antenna with an improved high-impedance surface (HIS) reflector is proposed. Dual-polarized radiation is excited by feeding a set of crossed dipoles. Low profile is achieved by utilizing an improved HIS reflector. Good impedance characteristics are realized by inserting small square cells among the primary hexagonal cells of the HIS. Two shorting pins and four parasites are introduced to increase port-to-port isolation and improve impedance matching, respectively. A prototype with profile 7.5 mm (about 0.06$\lambda$ and $\lambda$ equals to the wavelength at center frequency) was fabricated and measured. The experiment results show that the antenna element achieves 43$\%$ bandwidth ($\vert { S_{11}}\vert$$< $ $-$10 dB) from 2.0 to 3.1 GHz. The polarization isolation between those two ports is larger than 25 dB. The element was then extended to an eight-element phased array. The measured results demonstrate that the array can scan $\;\pm\text{50}^{\circ }$ for either polarization from 2.0 to 2.6 GHz.

中文翻译：

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基于改进HIS及其广角波束扫描阵列的低剖面宽带双极化天线

提出了一种具有改进的高阻抗表面 (HIS) 反射器的低剖面宽带双极化天线。通过馈送一组交叉偶极子来激发双极化辐射。通过使用改进的 HIS 反射器实现了低调。通过在 HIS 的主要六边形单元之间插入小的方形单元来实现良好的阻抗特性。引入了两个短路引脚和四个寄生元件，以分别提高端口到端口的隔离度并改善阻抗匹配。轮廓为 7.5 毫米（约 0.06$\lambda$ 和 $\lambda$等于中心频率处的波长）被制造和测量。实验结果表明，天线元件达到了43$\%$ 带宽（$\vert { S_{11}}\vert$$< $ $-$10 dB）从 2.0 到 3.1 GHz。这两个端口之间的极化隔离大于 25 dB。然后将该元件扩展为八元件相控阵。测量结果表明该阵列可以扫描$\;\pm\text{50}^{\circ }$ 适用于 2.0 至 2.6 GHz 的任一极化。