面向2G~5G通信的双频双极化基站天线设计

Dual-band Dual-polarization Base Station Antenna Design for 2G~5G Communication

为满足多种通信制式融合的无线通信需求,提出一款覆盖2G、3G、LTE、Sub-6 GHz波段的交叉偶极子基站天线。2对呈±45°正交的偶极子用以实现天线的双极化特性,辐射单元中的扇形内环、钻石状的外环分别对应天线要实现的低频以及高频波段,可以通过对内环以及外环结构参数的调整实现对2个频段的独立控制。天线上方的寄生贴片用以优化天线阻抗匹配。通过制作实物,测得天线在2个频段分别具有49.9%(1.70~2.80 GHz)和19.2%(3.20~3.88 GHz)的相对带宽,隔离度整体优于20 dB,主视轴的交叉极化比优于21 dB,2个波段的半功率波束宽分别为66°±5°、78°±6°。与已有研究比较,该天线结构简单,在交叉极化和增益方面具有显著优势。

In order to meet the wireless communication requirements of the convergence of multiple communication standards,a cross-dipole base station antenna covering the 2G,3G,LTE,and Sub-6 GHz bands is proposed.Two pairs of±45°orthogonal dipoles are used to achieve the dual polarization of the antenna.The fan-shaped inner ring and diamond-shaped outer ring in the radiation unit correspond to the low-frequency and high-frequency bands to be realized by the antenna,and the independent control of the two frequency bands can be realized by adjusting the structural parameters of the inner ring and the outer ring.A parasitic patch above the antenna is used to optimize antenna impedance matching.Through the production of real objects,the antenna is measured to have a relative bandwidth of 49.9%(1.70~2.80 GHz)and 19.2%(3.20~3.88 GHz)in the two frequency bands,the overall isolation is better than 20 dB,and the cross-polarization ratio of the main visual axis is better than 21 dB and the half-power beam widths of the two bands are 66±5°,78±6°,respectively.Compared with existing studies,this antenna has a simple structure and has significant advantages in cross-polarization and gain.