一种新型低剖面、双频、双极化宽频带阵列天线的研究与设计

A Novel Low-Profile,Dual-Band,Dual-Polarization Broadband Array Antenna

设计了一种结构新颖的双频、双极化基站阵列天线并进行了仿真和实验研究。双频阵列由采用新型印刷金属圆弧耦合馈电的圆环天线（低频）与交叉微带印刷振子（高频）嵌套构成。首次采用印刷金属圆弧耦合馈电拓宽了圆环天线带宽，并利用反相馈电技术提高了端口隔离度（〈-28aB）、加强了方位面方向图的对称性、降低了交叉极化电平；对在双频结构中受影响较大的高频阵元进行了相位误差分析；最后给出了整个双频阵列的实测结果，与仿真理论值吻合较好。该阵列天线具有宽频带（806～960MHz、1710～2170MHz）、低剖面（35nun）、高极化隔离、结构紧凑、方位面波瓣恒定（65±6°）等优点。适合用于双频基站系统或星载／舰载通信系统。

In this paper, a novel dual-band broadband array antenna with low profile and dual polarization is proposed and developed experimentally. The array is formed by novel are-probe-fed annular ring elements and pairs of cross mierostrip dipoles nested together. The bandwidth of the annular ring antenna is improved through arc-probe-fed technique. The measured impedance bandwidths determined by VSWR 〈 2 cover 806 ～ 960 MHz and 1710 ～ 2170MHz. The part isolation and the symmetry of the radiation for the lower band are improved by the ＂anti-phase and dual-feed＂ technique which also reduces the cross polarization level. The influences on the radiation patterns of upper band caused by the phase error are invested and the radiation patterns are improved through the phase compensation. The array is designed and the simulated and measured results are presented. The proposed array antenna is highly applicable to the base station of multi-band operations and satellite/shipborne communications.