新型单馈共口径三频三极化微带天线的设计∗

摘要

提出了一种新型的利用单口馈电的共口径三频三极化微带天线,该天线可覆盖北斗系统的3个工作频段。其中北斗一代L频段为左旋圆极化,S频段为右旋圆极化,采用单层结构两块贴片嵌套的形式实现双频工作,通过单馈形式引入微扰产生两个圆极化信号；北斗二代L：B3频段为线极化,通过挖孔耦合馈电的形式实现；天线采用单个底馈探针结合容性托盘耦合馈电,展宽了天线的工作带宽,弥补了单馈圆极化微带天线轴比带宽窄的缺点。%A novel microstrip antenna is designed of multiband and triple polarization with common-aperture fed through only a single coaxial probe,which covers triple band of Beidou. L band of Beidou1 radiates LHCP wave and S band radi-ates RHCP wave according to perturbation. Dual-band structure is stimulated by the outside and inside patches nested in a single substrate. Meanwhile,L band of Beidou2 is achieved by electromagnetic coupling feed,which radiates linearly polarized wave. And the antenna is definitely fed through a single coaxial from the bottom with tray capacitive coupling to broaden the operation bandwidth,which effectively compensates for a usual low axial ratio bandwidth for a single feed.