摘要
为了满足大功率反射面天线的馈源设计要求,文章设计了一种大功率圆极化交叉对称阵子天线,其工作频率在1.19GHz～1.285 GHz,天线整体由交叉对称阵子和开槽线巴伦组成.通过开槽线巴伦实现平衡-非平衡馈电.为了实现圆极化,通过改变对称阵子结构,在对称阵子臂相邻90°处增添一对阵子臂,形成交叉对称阵子,并通过调整阵子臂的长度,使其实现90°自相移结构,并最终实现圆极化,由于天线整体均为金属,使得天线可以承受更高的功率.该天线在1.19 GHz～1.285 GHz 频带内电压驻波比(votage standing wave ratio,VSWR)＜1.5,圆极化轴比＜3 dB,实测结果表明,实测和仿真结果基本一致,天线在该频段内实现了较好的圆极化特性.
Abstract
In order to meet the feed design requirements of high-power reflector antennas,a high-power circularly polarized cross-symmetric array antenna is designed,which works at 1.19 GHz～1.285 GHz.The antenna is composed of cross-symmetric antenna and slotted wire balun.The slotted wire balun realizes balanced-unbalanced feeding.In order to realize circular polarization,the structure of the symmetric antenna is changed by adding a pair of arms at 90° adjacent to the symmetric arms to form a cross-symmetric antenna.The length of the arms is adjusted to achieve a 90° self-phase-shifting structure,and finally realize circular polarization.Because the antenna is made of metal,the antenna can withstand higher power.The votage standing wave ratio(VSWR)of the antenna in the 1.19 GHz～1.285 GHz band is less than 1.5,and the circular polarization axis ratio is less than 3.The measured results show that the measured results are basically consistent with the simulation results,and the antenna has achieved good circular polarization characteristics in the frequency band.
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