具有稳定相位中心的三馈点圆极化微带天线

Triple-fed circular polarized microstrip antenna with stable phase center

介绍了一种具有稳定相位中心的圆极化微带天线。理论分析证明:采用幅度相等,相位相差120°的三馈电方式,圆形微带天线能获得圆极化辐射特性。中心对称的三馈点设计,天线可获得很高的相位中心稳定度。仿真结果显示:此天线相位中心的稳定度小于1mm.测试结果表明:在2.18～2.66GHz频带内该天线轴比小于3dB,相对带宽19.83%。

A circularly polarized microstrip antenna with stable phase center is introduced. Theoretical analysis proves that a circular microstrip antenna, which is excited by three symmetrical feeds with equal amplitudes and 120° phase shifts, can obtain circularly polarized radiation characteristics. Due to a centrosymmetric feeding configuration, the stability of phase center for the proposed antenna is very high. The simulated results show that the stability is less than 1 mm in the half power beamwidth. The measured 3-dB axial-ratio bandwidth is 19.83% from 2.18 to 2.66 GHz.