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在文章中,一种新型的可同时覆盖2G,3G,4G移动通信的超宽带天线被设计并制作出来。该天线综合采用了端部加载技术和特殊的双套筒技术。天线端部加载部分对天线输入阻抗的虚部起到了抵消的作用,从而使天线的阻抗曲线变化平缓,达到了拓宽天线阻抗带宽的目的。实测结果表明,在S11<-10d B条件下,该天线工作频率范围为0.783GHz~2.773GHz,即阻抗带宽为3.47:1,相对带宽为110.6%。在VSWR<1.5的条件下,该天线工作频率范围为0.86GHz~2.07GHz,即阻抗带宽为2.41:1,相对带宽为82.6%。同时,该天线具有水平全向的辐射特性。
In the article, a new type of ultra-wideband antenna that can simultaneously cover 2G, 3G and 4G mobile communications is designed and manufactured. The antenna incorporates end loading technology and special double sleeve technology. The antenna end loading part cancels the imaginary part of the antenna input impedance, so that the impedance curve of the antenna changes gently and the purpose of broadening the impedance bandwidth of the antenna is achieved. The measured results show that the operating frequency range of the antenna is from 0.783GHz to 2.773GHz under S11 <-10d B, that is, the impedance bandwidth is 3.47: 1 and the relative bandwidth is 110.6%. Under the condition of VSWR <1.5, the operating frequency of the antenna ranges from 0.86GHz to 2.07GHz, that is, the impedance bandwidth is 2.41: 1 and the relative bandwidth is 82.6%. At the same time, the antenna has horizontal omni-directional radiation characteristics.