High Frequency Analysis of the Vivaldi Antenna Parameters

The purpose of this paper is to analyze the influence of different constructive elements of a Vivaldi antenna on its characteristic parameters (directivity, gain, S parameters). An initial antenna is considered and the substrate material, width of the microstrip line used as feeding and the shape of the planar metallic antenna are then modified. The antenna is modeled with a high frequency numerical modeling program, namely HFSS. The values of the parameters obtained for the different structures following different modifications will be compared with the ones of the initial antenna and an optimum antenna will be determined.