带引向器的非对称平衡对拓Vivaldi天线设计

摘要

设计了一副改进的非对称平衡对拓Vivaldi天线.辐射贴片外边缘用3阶多项式曲线修正,以实现很宽的阻抗带宽.在天线口径处嵌入一个金属贴片作引向器以改善天线的辐射特性.对辐射贴片引入非对称性,使得E面波束偏离得到进一步补偿.实测结果表明,该天线具有极宽的工作带宽,在2 ～40 GHz内的增益大于0 dBi,且在15～30 GHz内的增益大于14 dBi;E面的波束偏离在6 ～40 GHz频率范围内小于3°.该天线具有结构简单、尺寸紧凑(44 mmn×98 mm)以及方向图稳定等优点.该天线能够较好地应用于相控阵、超宽带系统等.%A modified asymmetric balanced antipodal Vivaldi antenna is designed.The outer edges of the radiation patches are modified by a 3-order polynomial curve to achieve an extremely large impedance bandwidth.A metal patch is inserted in the antenna aperture to enhance the radiation characteristics.The beam tilts in E-plane are further compensated by introducing structure asymmetry on radiation patches.The measured results show that the proposed antenna achieves a very wide bandwidth from 2 to more than 40 GHz with peak gain ＞0 dBi and ＞14 dBi over the 15 ～ 30 GHz frequency range.Moreover,the squinted beam of E-plane is less than 3° from 6 to 40 GHz.The proposed antenna has advantages of simple structure,compact size(44 mm×98 mm),and stable radiation patterns.This antenna can be a good candidate for phased array,ultra-wideband(UWB) system and so on.