一种超宽带高增益对踵Vivaldi天线

An ultra-wideband high-gain antipodal Vivaldi antenna

本文设计了一种带宽3.3~40 GHz的新型超宽带高增益对踵Vivaldi天线,该天线介质板两侧采用相同的辐射结构,由一个微带线和两条指数型槽线构成.在天线辐射方向添加一块梯形结构介质板,将天线正反两面的表面电流限制在天线辐射方向,既可以矫正E面方向图的增益峰值偏移角度,也可以提升天线辐射强度.实测结果显示,3.3~40 GHz带宽内的驻波比均小于2,倍频带宽大于12,增益为1.0~12.6 dB.该天线的E面方向图对称性好,天线的交叉极化比小,且易于设计、成本低廉,在超带宽、高增益的天线领域具有较高应用价值.

A novel ultra-broadband high-gain antipodal Vivaldi antenna is designed with a bandwidth of 3.3-40 GHz frequency.The same radiation structure,which consists of one microstrip line and two exponential slot lines,is printed on both sides of the dielectric plate.In order to effectively constrain the surface current in the radiation direction,a trapezoidal dielectric substrate is added in the radiation direction,which can not only correct the gain peak offset angle of E-plane pattern,but also improve the radiation intensity of antenna.The measured results show that the VSWR(Voltage Standing Wave Ratio)is smaller than 2 at the frequency band of 3.3-40 GHz,the frequency doubling bandwidth is up to 12,and the gain is 1.0-12.6 dB.In addition,the antenna has the characteristics of good symmetry in E-plane pattern,small cross-polarization ratio,simple structure,easy processing and low cost,thus it has high research significance and application prospects in antenna with high bandwidth and high gain.