基于北斗系统的稳定相位中心圆极化微带天线

Circular polarized microstrip antenna with stable phase center based-on BDS

北斗系统中,圆极化天线的相位中心稳定性是高精度导航定位的关键环节。为达到这一技术要求,设计了一种一分四馈电网络,通过幅度相等、相位依次相差90°的四点馈电方式,实现圆极化。同时采用HFSS仿真软件对馈电点位置进行优化,提高相位中心稳定度。仿真结果显示,该天线相位中心稳定度达到1.104mm,同时圆极化辐射性能优越,具备很强的工程应用价值。

The stability of antenna phase center is important to navigate and locate precisely in BeiDou System. To meet the technical requirements, a four ways feed network is designed. By using four points feed method which amplitude is equal and phase difference is 90 degree in proper sequence, the circular polarized performance is realized. By using the HFSS simulation software to optimize the location of point feed, the stability of the antenna phase center is enhanced. Simulation results show that the stability of the antenna phase center is up to 1. 104 mm, and at the same time, the circular polarized radiation performance of antenna is excellent, which indicate that the antenna has great engineering application value.