This Letter presents a dual linearly polarised microstrip antenna for base station applications. Firstly, a dual-polarised metasurface-based antenna element employing differential feeding technology is proposed. The proposed antenna element achieves a simulated bandwidth of 11.6% for | S 11 | < −15 dB, mutual coupling better than 30 dB, and the cross-polarisation discrimination level over 35 dB. Secondly, based on the antenna element, a 3 × 3 antenna array is eventually presented, which was fabricated and characterised. The measured bandwidth is 12% for | S 11 | < −10 dB, and the port-isolation is over 25 dB. The superiorities of low-profile and high port isolation indicate that the proposed design is a promising candidate for sub-6G base-station applications.

中文翻译：

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用于基站应用的低剖面双极化超表面天线阵列

本文介绍了一种用于基站应用的双线性极化微带天线。首先，提出了一种采用差分馈电技术的基于双极化超表面的天线元件。建议的天线元件实现了 11.6% 的模拟带宽 | 11 | < -15 dB，互耦合优于30 dB，交叉极化鉴别水平超过35 dB。其次，基于天线元件，最终提出了一个 3 × 3 的天线阵列，并对其进行了制造和表征。测得的带宽为 12% | 11 | < −10 dB，并且端口隔离度超过 25 dB。低剖面和高端口隔离的优势表明，所提出的设计是亚 6G 基站应用的有希望的候选者。