一种用于5G MIMO 系统的宽带高增益圆极化天线

为提升5G无线通信系统容量,设计了一款基于V 形缝隙耦合馈电的宽带高增益圆极化天线。该天线采用双层辐射贴片结构,拓展天线的阻抗带宽,并分别在辐射贴片和寄生贴片上刻蚀一对半径不等、位置正交的双圆形缝隙,有效改善了天线的圆极化特性。通过加载平板反射器提高天线的前后比,实现良好的定向辐射。实测结果表明,驻波比小于2的阻抗带宽为53.55% (2.27~3.93 GHz),在半功率波束宽度范围内轴比小于3 dB,轴比带宽为27.38%(2.9~3.82 GHz),在工作频带内实测的天线平均增益达到8.22 dBi。该天线适合作为5G多天线系统中的智能天线单元进行自适应波束赋形。

A Broadband and High Gain Circularly Polarized Antenna for 5G MIMO System

In order to increase the system capacity of 5G wireless communication, a broadband and high-gain circularly polarized antenna based on V-shaped slot coupling feed is designed. The antenna adopts a double-layered radiation patch structure to expand the impedance bandwidth, and a pair of circular slots of different radii and orthogonal positions are etched on the radiant patch and parasitic patch, effectively improving the circular polarization characteristics of the antenna. A tablet reflector is added to increase the front-to-back ratio of the antenna to achieve excellent directional radiation. The simulated and measured results show that the impedance bandwidth of VSWR less than 2 is 53.55% (2.27-3.93 GHz) and the axial ratio bandwidth is 27.38% (2.9-3.82 GHz). In the half-power beam width, the axial ratio is less than 3 dB, the axial ratio bandwidth is 27. 38% (2.9-3.82 GHz), and the average measured antenna gain in the operating frequency band is 8.22 dBi. It is suitable as a smart antenna element in a 5G multi-antenna system for adaptive beam-forming.