一种高效率背腔微带振子阵列天线设计

Design of a High Efficiency Back Cavity Microstrip Dipole Array Antenna

针对卫星通信需求,设计了一种L/S波段宽带圆极化背腔印刷板微带振子阵列天线,由5个切边矩形微带贴片振子辐射单元组成,可实现左右旋双圆极化辐射,又可形成差波束信号用于跟踪。通过对矩形微带贴片、背腔大小以及布阵间距进行结构调整得到一种新型宽带圆极化天线。仿真结果表明,天线工作频段为1.3~2.4 GHz,在通带内轴比参数AR<2,绝对带宽达到1.1 GHz,相对带宽达到59.5%。实现宽带工作的同时,具有良好的圆极化特性。将其作为反射面天线的馈源,使天线具有很高的增益和效率。

To meet the requirements of satellite communication,an L/S band broadband circularly polarized back cavity printed board microstrip dipole array antenna is designed.The antenna consists of five trimmed rectangular microstrip patch dipole radiating elements,which can realize left and right circular dual circularly polarized radiation.A differential beam signal is formed for tracking.A novel broadband circularly polarized antenna is obtained by structurally adjusting the rectangular microstrip patch,the size of the back cavity and the spacing of the array.The full-wave simulation analysis of the antenna is carried out by using the electromagnetic simulation software HFSS.The simulation results show that the operating frequency band of the antenna is 1.3~2.4 GHz,the internal axis ratio parameter AR<2 in the pass band,the absolute bandwidth reaches 1.1 GHz,and the relative bandwidth reaches 59.5%.The antenna has good circular polarization characteristics while achieving broadband operation.The circularly polarized array antenna has the characteristics of high radiation efficiency,high cross polarization isolation,simple structure and easy processing.When the proposed antenna is used as the feed source of reflector antenna,the antenna as a whole can have high gain and efficiency.