超宽带Vivaldi阵列天线设计

摘要

为了满足超宽带系统对天线的需求，本文设计并制造了覆盖6～18GHz频带的超宽带Vivaldi阵列天线，并采用微带渐变线功分器网络达到超宽带馈电与低损耗传输的目的。通过组阵与添加寄生单元进一步降低天线驻波，提高了阵列性能。仿真计算与实测结果表明该阵列天线在超宽频带内驻波小于2．1，并且具有优良的辐射特性。%For satisfying request of the UWB system for antenna, an ultra wide-band Vivaldi array antenna which covering the frequency band from 6GHz to 18GHz is designed and manufactured. And the microstrip tapered-line power divider is adopted to achieve ultra wide-band feeding and low-cost transmission. Arranging array and adding parasitic elements can further reduce VSWR of the antenna, and enhance performance of the array. The simulated computation and measured results indicate that the VSWR of this array antenna is less than 2. 1, and the array antenna has excellent radiation characteristic in the ultra wide frequency band.