一种新型宽波束圆极化微带天线的设计

Design of novel wide-beam circularly polarized antenna

设计了一种新型宽波束圆极化微带天线,该天线采用四探针馈电,馈电网络由威尔金森功分器和传输线移相器组成,使四个馈电探针的相位依次相差π/2,实现了右旋圆极化辐射。通过Ansoft HFSS仿真结果表明:该微带天线结构简单、极化纯度高、全向性能好、轴比小于3dB的圆极化带宽达到27.7%,高于一般的微带圆极化天线(轴比小于3dB带宽约为15%)。天线可以很好地满足GPS通信的技术要求,也可用于无线局域网。

The paper provides a novel design of wide-beam circular polarization microstrip antenna which uses a four-probe feeding for power, and the feed network contains three Wilkinson power dividers and transmission phase shifter, which produces a ordinal π/2 phase-shifting between the four probes and realizes the right circular polarization radiation. The simulation results through Ansoft HFSS show that this antenna has many advantages of simple structure, high polarization purity and good omni-direction performance. The circular polarization bandwidth for axial ratio less than 3 dB reaches 27.7% and the bandwidth of the proposed antenna is higher than that of the general circularly polarized microstrip antenna （the bandwidth for axial ratio less than 3 dB is 15 %）. The antenna can meet the requirements of GPS communication technology and also be applied in the wireless local area network.