ABSTRACT In this paper, the concept of the circularly polarized agile, multiple-input multiple-output (MIMO) dielectric resonator antenna (DRA) structure for fifth generation (5G) new radio application in mobile terminal is presented. Two prototypes have been fabricated, namely one with cylindrical DRA (CDRA) referred as A1 and a second one with ring DRA (RDRA) named as A2. These practical realizations of dual-port MIMO antennas have been mounted on a Rogers 5870 substrate of octagonal shape with proper ground architecture. The proposed dual-port MIMO antennas have been excited with conformal probes and L-type feed network aiming to achieve circular polarization (CP). Measured impedance bandwidth of A1 and A2 are 21.2% (3.15–3.9 GHz) and 22.2% (3.12–3.9 GHz), respectively. Moreover, for both antennas low mutual coupling between ports with minimum isolation of dB over entire impedance bandwidth has been obtained by using triangular head slots in the ground plane. Measured axial ratio bandwidths in broadside direction are 5.66% (3.26–3.45 GHz) and 4.25% (3.45–3.6 GHz), respectively. Maximum gains are 7.3 and 7.2 dBi, in that order. MIMO antenna parameters such as envelope correction coefficient, diversity gain (DG), mean effective gain and total active reflection coefficient are also calculated to verify MIMO performance parameters. The proposed antennas also demonstrate CP agility with insertion of concentric cylindrical shells of different radii.

中文翻译：

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具有圆极化适应性的多输入多输出介质谐振器天线，适用于 5G 应用

摘要 在本文中，提出了用于移动终端中第五代 (5G) 新无线电应用的圆极化捷变、多输入多输出 (MIMO) 介质谐振器天线 (DRA) 结构的概念。已经制造了两种原型，即一种带有圆柱形 DRA (CDRA) 的称为 A1，另一种带有环形 DRA (RDRA) 称为 A2。双端口 MIMO 天线的这些实际实现已安装在具有适当接地结构的八角形 Rogers 5870 基板上。所提出的双端口 MIMO 天线已被共形探针和 L 型馈电网络激发，旨在实现圆极化 (CP)。A1 和 A2 的测量阻抗带宽分别为 21.2% (3.15–3.9 GHz) 和 22.2% (3.12–3.9 GHz)。而且，对于两个天线，通过在接地平面中使用三角形头槽，端口之间的低互耦合在整个阻抗带宽上具有最小的 dB 隔离度。横向测量的轴比带宽分别为 5.66% (3.26–3.45 GHz) 和 4.25% (3.45–3.6 GHz)。最大增益依次为 7.3 和 7.2 dBi。还计算了包络校正系数、分集增益（DG）、平均有效增益和总有源反射系数等 MIMO 天线参数，以验证 MIMO 性能参数。所提出的天线还通过插入不同半径的同心圆柱壳来展示 CP 敏捷性。分别为 66% (3.26–3.45 GHz) 和 4.25% (3.45–3.6 GHz)。最大增益依次为 7.3 和 7.2 dBi。还计算了包络校正系数、分集增益（DG）、平均有效增益和总有源反射系数等 MIMO 天线参数，以验证 MIMO 性能参数。所提出的天线还通过插入不同半径的同心圆柱壳来展示 CP 敏捷性。分别为 66% (3.26–3.45 GHz) 和 4.25% (3.45–3.6 GHz)。最大增益依次为 7.3 和 7.2 dBi。还计算了包络校正系数、分集增益（DG）、平均有效增益和总有源反射系数等 MIMO 天线参数，以验证 MIMO 性能参数。所提出的天线还通过插入不同半径的同心圆柱壳来展示 CP 敏捷性。