基站双波束透镜天线的研究

Research on Dual-Beam Lens Antenna in the Base Station

提出了一种应用于基站的双波束透镜天线。其中透镜采用恒介电常数的介质制成,形状为介质分层嵌套的圆环柱体。其分层的方法是采用改进的等间距分层法,利用相邻介质层的介电常数等效分界点的介电常数。透镜采用分块放置的形式,不仅可以实现能量聚焦,提高增益,同时还改善了天线交叉极化的指标。此透镜天线采用对称的两列天线从下方馈电,从而在单扇区内实现双波束。通过专业电磁仿真软件Ansoft HFSS建模仿真,结果显示,在1.71~2.17 GHz的宽频带范围内,该双波束透镜天线具有良好的方向图性能。

A dual-beam lens antenna for the base station is proposed in this paper.The lens is made up of a number of concentric circular cylinders with a certain dielectric constant.The method of layering is using improved equal interval method,and the dielectric constant at the cut-off point is equivalent to the adjacent dielectric constant.At the same time,the lens is divided into blocks,which can not only obtain the gain,but also improve the cross polarization.On the other hand,the dielectric lens feeding by two antenna arrays which are arranged symmetrically under them,are designed to achieve dual beams in one sector.Ansoft HFSS is used for modeling and simulation.As a result,this dual-beam antenna has a good performance in the broadband of 1.71 ~ 2.17 GHz.