一种W波段圆极化微带天线研究

Circular polarization microstrip antenna at W band

研究了不同馈电形式的W波段圆极化微带天线阵列,并采用等幅同相馈电方式以及新型波导到微带过渡结构,完成了圆极化阵列天线的设计.由理论分析和仿真结果可知,通过选择合适的介质,以及利用单元间等幅同相馈电,既能有效减小W波段天线的损耗,又能实现圆极化的良好轴比特性.功分网络的合理排布,波导到微带过渡结构亦有利于减小天线损耗.对8×8阵列天线进行实测,S(1,1)小于-15dB的相对带宽为4.3%,轴比小于3dB的波瓣宽度为11°,中心频点94GHz时天线增益为20.6dB,与仿真结果基本吻合.

A circular polarization array antenna at W band is designed by analyzing and comparing different feeding forms, using constant amplitude and in-phase feed- ing and waveguide-microstrip transition. According to the theoretical analysis and simulation results, the loss of W band antenna can be reduced,good axial ratio and suitable arrangement of feeding network can be realized by choosing proper dielec- tric, using waveguide-microstrip transition and constant amplitude and in-phase feeding of each unit radiation patch,which is ideal for the realization of circular po- larization array antenna at W band. The bandwidth of the 8 × 8 array antenna are 4.3% when S（1,1）〈-15 dB. The beamwidth of the antenna is 11° when axial ratio is below 3 dB. And the maximum achievable gain of this antenna is 20.6 dB. Test and simulation results are in good agreement.