设计了一款新型超宽带对跖Vivaldi天线.该天线介质板两侧采用相同的金属辐射贴片结构,并在主轴方向加载梯形介质基板,进而改善了天线的电场分布,将电场有效地约束在主轴辐射方向,从而提高了天线的定向辐射特性.实测结果与仿真结果基本吻合,该天线在2.5~40 GHz频率范围内电压驻波比小于2,增益为1.8~8.9 dB.此外,E面方向图保持良好的对称性,增益峰值偏移现象得到明显抑制,具有辐射方向性好、增益高、主瓣宽度窄、交叉极化比小等优点.%An novel ultra-wideband Vivaldi antenna is designed,this antenna has the same structure of metal radiation patch on both sides of dielectric plate.In order to effectively constrain the electric field in the direction of main axis radiation,a trapezoidal dielectric substrate is loaded in the direction of major axis,which improves the directional radiation performance.The measured results show that the VSWR of this antenna is smaller than 2 between 2.5~40 GHz,its gain is 1.8~8.9 dB.In addition,the antenna pattern maintains good symmetry,gain peak shifting at E-plane is significantly restrained,and it also has the advantages of good radiation direction,high gain,narrow main lobe width and low cross-polarization ratio.
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