C波段小型化宽带双圆极化微带阵列天线设计

Design of a C-band miniaturized broadband double-circularly polarized microstrip array antenna

摘要:

设计实现了一种工作在C波段的2×2的宽带小型化双圆极化微带阵列天线.通过多层结构和支节匹配技术，拓展带宽；T型功分器顺序相差馈电形成馈电网络且左右旋馈电网络分层排布，实现小型化.实物测试结果表明，该天线VSWR<2的阻抗带宽达39.5%，左旋和右旋3dB轴比带宽均达到28.6%以上，在工作频带3.4GHz-4.2GHz内，左旋和右旋增益均在10dB以上，天线阵列尺寸仅为1.27λ0×1.27λ0×0.1λ0.实物测试结果与仿真结果吻合良好.

Abstract:

This paper designes a 2×2 miniaturized broadband double-circularly polarized microstrip array antenna that works on C-band. The antenna extends the bandwidth through a multi-layer structure and the tuning stub matching technique. In order to achieve miniaturization，the T-type power divider are sequentially phase-differentiated to form a feed network，and the feed network is arranged hierarchically. The test result indicates. The impedance bandwidth of the antenna is 39.5%，and the axial ratio bandwidth both of left and right ciculary poarized is less than 3dB above 28.6%. In the 3.4GHz-4.2GHz，the gain is above 10dB.The antenna array is only 1.27λ0×1.27λ0×0.1λ0. The measured results are in good agreement with the simulated results.