一种新型小型化宽带平面全向天线

在传统圆形单极子平面天线的基础上引入了Wilkinson功分器、渐变型微带馈线和瓶状接地板结构,设计了一款3.4~7.4 GHz频段的新型小型化宽带平面全向天线.通过引入Wilkinson功分器来改善天线方向图不圆度,较好地实现全向辐射;天线背面采用瓶状结构的金属接地板,达到了良好的阻抗匹配效果.结果表明：该平面全向天线驻波比小于2的阻抗带宽为4 GHz,中心频点5.4 GHz处的增益为3.35 dB,中心频点5.4 GHz在天线辐射方向的不圆度小于3.50 dB,整个阻抗带宽内的增益为2.3~3.35 dB,仿真结果与实测结果基本吻合.

A novel miniaturized wideband planar omnidirectional antenna

A novel miniaturized wideband plane omnidirectional antenna with 3.4-7.4 GHz band is designed in this paper.Based on traditional circular monopole planar antenna,the antenna introduces a Wilkinson power divider,a tapered microstrip feeder,and a bottled floor structure.A Wilkinson power divider is introduced at the microstrip feeder to improve the unroundness of pattern,which achieves better omnidirectional radiation;and a metal ground floor of bottle shaped structure is printed on the back of this antenna to achieve good impedance matching effect.The results show that the planar omnidirectional antenna has impedance bandwidth of 4 GHz,the gain at the center frequency of 5.4 GHz is 3.35 dB,the unroundness of radiation pattern at the center frequency of 5.4 GHz is less than 3.50 dB,and the gain at the whole impedance bandwidth is 2.3-3.35 dB.The simulation results are basically consistent with the measured results.