A typical 5G multiple-input and multiple-output (MIMO) system must combine a high number of antennas at both the transmitter and receiver to realize spatial multiplexing capability. In this paper, a wideband 16- element indoor base station (BS) antenna array that can cover 3.3–6.0 GHz is proposed for 5G applications. A π-shaped monopole antenna is designed to cover the Lower band (LTE bands 42/43–N77–N78), the intermediate band (N79), and the higher band (LTE 46). The antenna elements are arranged in a limited space printed on a substrate take the Hexakaidecagon Polygon shape. As the antenna elements are arranged with good isolation, achieving good polarization diversity. The proposed BS array is simulated, fabricated, and tested. The typical results, S-parameters, antenna efficiency, and radiation patterns are investigated. Moreover, to validate the MIMO performances, a very low envelope correlation coefficient (ECC) below 0.02, high antenna efficiency of about 82–93.2% are achieved. The calculated ergodic channel capacity of the 16 × 16 MIMO system reached up to 85 bps/Hz. The proposed antenna array was compared to some other 5G MIMO indoor base station antennas.

典型的 5G 多输入多输出 (MIMO) 系统必须在发射器和接收器处结合大量天线，以实现空间复用能力。在本文中，针对 5G 应用提出了一种可覆盖 3.3-6.0 GHz 的宽带 16 单元室内基站 (BS) 天线阵列。π 形单极天线设计用于覆盖低频段（LTE 频段 42/43–N77–N78）、中频段（N79）和高频段（LTE 46）。天线元件布置在印制在六边形多边形基板上的有限空间内。由于天线元件排列隔离度好，实现了良好的极化分集。对所提出的 BS 阵列进行了仿真、制造和测试。研究了典型结果、S 参数、天线效率和辐射方向图。而且，为了验证 MIMO 性能，实现了低于 0.02 的非常低的包络相关系数 (ECC)，实现了约 82-93.2% 的高天线效率。计算得到的 16 × 16 MIMO 系统的遍历信道容量高达 85 bps/Hz。将建议的天线阵列与其他一些 5G MIMO 室内基站天线进行了比较。