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设计并加工了一种采用同轴背馈方式馈电的小型化宽带圆极化微带天线。针对单点馈电微带天线轴比带宽窄的问题,通过增加馈电网络对天线辐射贴片进行双点馈电以展宽轴比带宽,得到了良好的效果。馈电网络根据带状线理论设计,利用U形接地板巧妙地实现了宽带天线的结构小型化。通过对辐射贴片的双点馈电获得了令人满意的电压驻波比带宽和良好的圆极化性能。通过仿真和实际测试表明,该天线VSWR≤2的带宽达到了30%,3 dB圆极化带宽约为26%,同时频带内天线的增益达到4 dB。
A miniaturized wideband circularly polarized microstrip antenna with coaxial feed back feeding is designed and fabricated. In view of the problem that the single-feed microstrip antenna axis is narrower than the bandwidth, two-point feed of the antenna radiation patch is performed by increasing the feed network to broaden the axial ratio bandwidth, and the good effect is obtained. Feeder network based on the stripline theory design, the use of U-shaped ground plane cleverly realized the structure of the broadband antenna miniaturization. Satisfactory voltage standing wave ratio bandwidth and good circular polarization performance are obtained through the dual point feeding of the radiation patch. The simulation and practical tests show that the bandwidth of VSWR≤2 is 30%, the bandwidth of 3 dB circular polarization is about 26%, and the gain of the antenna in the frequency band reaches 4 dB.