This work presents a reflectarray-based base station antenna to integrate both backhaul (BH) and fronthaul (FH). The reflectarray operates at 28 GHz in dual linear polarization, using one polarization for the BH and another for the FH. The BH is a pencil beam of maximum gain pointing in a certain direction, while the FH defines the coverage for a femtocell. The FH is used to generate the coverage within the near field radiated by the base station. The synthesis of the FH is carried out by means of a near-field phase-only synthesis (NF-POS), while the BH is analytic. Both phase-shift distributions are physically implemented using a unit cell based on a double-layer topology of coplanar dipoles. The reflectarray is manufactured and evaluated in a spherical range (far field) and a planar range (near field). The measurements agree with the simulations, showing that a single antenna based on a reflectarray can be used to implement the dual link FH and BH.

中文翻译：

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用于下一代 5G FR2 Femtocell 中同时近场前传和远场回传链路的反射阵列天线

这项工作提出了一种基于反射阵列的基站天线，可集成回程 (BH) 和前程 (FH)。反射阵列以双线性偏振工作在 28 GHz，其中一种偏振用于 BH，另一种偏振用于 FH。 BH 是指向特定方向的最大增益笔形波束，而 FH 定义毫微微蜂窝基站的覆盖范围。 FH用于生成基站辐射的近场范围内的覆盖范围。 FH 的合成是通过近场纯相位合成 (NF-POS) 进行的，而 BH 是解析的。两种相移分布都是使用基于共面偶极子双层拓扑的单元来物理实现的。反射阵列是在球形范围（远场）和平面范围（近场）中制造和评估的。测量结果与仿真结果一致，表明基于反射阵列的单天线可用于实现双链路 FH 和 BH。