In this paper, a novel compact, dual-polarized, dual-broadband shared-aperture antenna array unit consisting of a lower-band (LB) element and 4 upper-band (UB) elements underneath is proposed for 5G mobile communications. L-shaped parasitic branches are introduced in the LB to expand the bandwidth and suppress the mutual coupling between the LB element and UB elements. Compared with the traditional lower-band dipole, the proposed LB element has far less influence on the electric field of the UB array, thus preserving their radiation patterns. To verify the performance, the antenna was fabricated and experimentally demonstrated to achieve the bandwidth of 32.7% (0.69-0.96 GHz) in the LB and 45.5% (1.7-2.7 GHz) in the UB with VSWR < 1.5. High port isolation and stable radiation pattern have been attained in both the LB and UB as required for dual-band base station antennas.

中文翻译：

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一种用于 5G 移动通信的新型跨频段解耦共享孔径基站天线阵列单元

本文针对 5G 移动通信提出了一种新型紧凑型双极化双宽带共享孔径天线阵列单元，该天线阵列单元由一个低频段 (LB) 元件和下面的 4 个高频段 (UB) 元件组成。在LB中引入L形寄生支路以扩大带宽并抑制LB元件和UB元件之间的相互耦合。与传统的低频带偶极子相比，所提出的 LB 元件对 UB 阵列的电场影响要小得多，从而保留了它们的辐射方向图。为了验证性能，制造并实验证明了天线在 LB 中实现了 32.7% (0.69-0.96 GHz) 的带宽，在 UB 中实现了 45.5% (1.7-2.7 GHz) 的带宽，VSWR < 1.5。