This paper introduces a compact Multiple input Multiple output (MIMO) antenna system for vehicular application in the sub-6GHz 5G systems that operates in the middle and high frequency bands from 1.71GHz to 5GHz. The proposed design consists of two symmetrical raised printed monopoles on Flame Retardant 4 (FR4) dielectric material with Partial Ground Plane (PGP) structure to improve bandwidth impedance and achieve higher isolation across the operating frequency range. The design is an excellent candidate to be implement in a shark-fin housing due to its low-profile characteristics and good electrical performance. The antennas are simulated using HFSS software and then prototypes are made and measured on a one-meter rolled-edge ground plane in an anechoic chamber. The electrical performance results of the proposed design and its MIMO characteristics are discussed and plotted in terms of Voltage Standing Wave Ratio (VSWR), passive isolation, radiation patterns, radiation efficiency, linear average gain (LAG), Diversity Gain (DG), and Envelope Correlation Coefficient (ECC).

中文翻译：

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用于汽车 5G 无线通信的宽带凸起印刷单极天线

本文介绍了一种紧凑型多输入多输出 (MIMO) 天线系统，适用于在 1.71GHz 至 5GHz 的中高频段运行的 6GHz 以下 5G 系统中的车载应用。所提出的设计包括两个对称的凸起印刷单极子，位于阻燃 4 (FR4) 介电材料上，具有部分接地层 (PGP) 结构，以提高带宽阻抗并在整个工作频率范围内实现更高的隔离度。由于其低剖面特性和良好的电气性能，该设计非常适合在鲨鱼鳍外壳中实施。使用 HFSS 软件对天线进行仿真，然后在消声室中的一米卷边接地平面上制作和测量原型。