一种全向环形缝隙阵列天线设计

Design of an Omnidirectional Annular Slot Array Antenna

提出了一种新型的全向平面缝隙阵列天线.8对环形缝隙背靠背蚀刻于带状线两侧地板,作为辐射单元,并且通过中心导带串行馈电.通过在环形缝隙内部加载一对Y形缝隙枝节,提升单元辐射性能.为进一步拓宽工作带宽,提高增益,采用遗传算法(GA)对天线进行优化设计,根据设计结果加工制作了天线样品.测量结果表明,天线的阻抗带宽(|S_(11)|<-10 dB)为5.69%(5.64 GHz~5.97 GHz),峰值增益为9.68 dBi,水平方向最大增益变化小于0.5 dB,在工作频带内具有稳定的全向辐射性能.

A novel planar slot array antenna with omnidirectional radiation in the horizontal plane is proposed.There are totally 8 back-to-back annular slots as radiators etched on both ground planes of the strip line,which are serially fed by the strip.The radiation performance of the element is improved by loading a pair of Y-shaped slot branches inside the annular slot.In order to further broaden the bandwidth and improve the gain,genetic algorithm(GA)is used to optimize the antenna parameters.A prototype antenna is fabricated and measured,and the results show that the impedance bandwidth(|S_(11)<-10 dB|)of the antenna is 5.69%(5.64 GHz~5.97 GHz),the peak gain is 9.68 dBi,and the gain variation in the horizontal direction is less than 0.5 dB.It exhibits stable omnidirectional performance over the impedance bandwidth.