一种宽带Vivaldi天线仿真设计

Simulation and Design of a Broadband Vivaldi Antenna

相控阵馈源接收机相互交叠的波束可形成更为连续的视场,大大提高了射电天文巡天观测效率,作为一种新兴的阵列天线接收系统,被越来越多的应用于射电天文领域。随着射电天文对超宽带、大视场等需求的不断攀升,相控阵馈源系统的工作带宽也在不断拓展。Vivaldi天线作为一种端射行波天线,被广泛应用于相控阵系统中。相对相控阵馈源应用来说,Vivaldi天线在展现自身宽带性能的同时,在紧密排列的紧耦合阵列情况下可实现超宽带特性。本文设计一种工作于0.7~1.8GHz下的宽带Vivaldi天线,带内回波损耗仿真结果在-10dB以下,带内天线增益仿真结果大于4.2dB。后续工作将进一步开展相控阵馈源阵列仿真及优化设计。

The overlapped beams of Phased Array Feed receivers can form a more continuous field of view,which greatly improves the efficiency of radio astronomy observation.As a new array antenna receiving system,it is more and more used in the radio astronomy.With the increasing demand of radio astronomy for ultra broadband and large field of view,the working bandwidth of phased array feed system is also expanding.Vivaldi antenna is widely used in phased array system as a kind of end launched traveling wave antenna.Compared with phased array feed applications,Vivaldi antenna can achieve ultra wideband characteristics in the case of tightly coupled arrays while displaying its broadband performance.In this paper,a broadband Vivaldi antenna operating at 0.7-1.8 GHz is designed.The simulation results of in band return loss are all below-10 d B,and the simulation results of antenna gain in band are all greater than 4.2 dB.The following work will further develop the phased array feed array simulation and optimization design.