一种双频双圆极化微带天线的设计

A Novel Design of Dual-Band and Dual Circularly Polarized Microstrip Antenna

提出了一种仅利用单端口馈电的共口径双频双圆极化微带天线。天线通过在对应高端谐振频率的圆形贴片外层附加对应低端谐振频率的圆环形贴片,并采用四个窄带条连接两贴片,从而实现双频工作;通过在圆形和圆环形贴片外侧开缺口的方式实现了圆极化波辐射,并通过在两贴片上开置的缺口相正交,从而形成了低端右旋圆极化(RHCP)、高端左旋圆极化(LHCP)的特性。对提出的天线进行了仿真并优化设计,给出了该天线在两个谐振频段上具有较好的阻抗匹配和双圆极化性能。

A microstrip antenna is designed of dual-band and dual circularly polarization(CP)with common apeture using only one probe feeding.The inside smaller circular patch operates at higher frequency and the outside circular ring patch operates at the low frequency,while four narrow strip connect the two patches.The perpendicular perturbation segments at the side of the inside and outside patch are used for achieving CP radiation with LHCP and RHCP respectively.From the simulation and optimization,the proposed antenna operates well impedance matching and dual CP performance.