多频双圆极化北斗天线设计

Multi-band dual circularly polarized antenna for Beidou navigation system

设计了一款应用于北斗导航系统的新型小型化圆极化天线。天线采用多层层叠结构设计辐射单元和馈电网络,将B3频段、B1频段、L频段、S频段集成为一个单元。上层天线采用单馈切角形式,实现S波段的右旋圆极化,中间层采用3 dB定向耦合器馈电分别实现B1和L的右旋和左旋圆极化,底层采用威尔金森功分器双馈实现B3的圆极化,天线尺寸仅60 mm×60 mm×21.6 mm。仿真结果和实测结果指标均满足北斗导航系统对天线性能的要求。

A novel miniaturized circularly polarized antenna used in Beidou navigation system is designed in this paper.The antenna adopts multi-layer laminated structure to design the radiation elements and feed network,and integrates B3 band,B1 band,L band and S band into one unit.Antenna placed on the top layer adopts the form of angle cutting to realize the right-handed circular polarization of the S band,the middle layer adopts 3 dB directional coupler to realize the right-handed and left-handed circular polarization of B1 band and L band respectively,and the bottom layer adopts Wilkinson power divider to realize the circular polarization of B3 band.The size of the antenna is only 60 mm×60 mm×21.6 mm.The indicators of the simulation and measured results are suitable for the requirements of Beidou system.