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文章采用连续旋转馈电技术,以双馈方形贴片圆极化微带天线作为单元设计了C波段4元宽频带圆极化微带天线阵。在馈电网络设计时采用威尔金森功分移相器,可以改善天线阵的阻抗带宽。连续旋转馈电技术和威尔金森功分器的引入展宽了天线阵的轴比带宽,背馈的馈电形式消除了馈电网络辐射对天线的圆极化辐射特性的影响,使天线阵的圆极化带宽进一步得到拓展。实测结果表明:在回波损耗小于-10dB条件下,该天线阵的阻抗带宽达到75.0%,轴比小于2dB的带宽达到45.6%。
In this paper, C-band 4-band wideband circularly polarized microstrip antenna array is designed by using continuous feed technology and doubly fed square patch circularly polarized microstrip antenna as a unit. Using Wilkinson power splitters in feed network design improves the impedance bandwidth of the antenna array. The continuous rotation feed technology and the introduction of Wilkinson power splitter broaden the axial ratio bandwidth of the antenna array. The feed back form of feed back eliminates the influence of the feeding network radiation on the circularly polarized radiation characteristics of the antenna, Circular polarization bandwidth is further expanded. The experimental results show that the impedance bandwidth of the antenna array reaches 75.0% under the condition that the return loss is less than -10 dB, and the bandwidth of the antenna array with the axial ratio less than 2 dB reaches 45.6%.