Some Parametric Studies on Vivaldi Antenna

Purpose of this paper is to study parametrically the impedance and radiation characteristics of a Vivaldi Antenna [1]. Usually, the performance of Vivaldi is sensitive to the parameters, the effects of major geometry parameters of the radiators and feeding transition on antenna performance are investigated across the frequency range of 3.1 to 10.6 GHz. The Vivaldi elements are fed by broadband microstrip-to-slotline baluns. A 2:1 bandwidth (3.4 to 7 GHz) was achieved for VSWR, gain and cross-polarization isolation. The design iteration, simulations results are presented. The information derived from this study provides guidelines for the design and optimization of the Vivaldi antenna which are widely used for UWB applications.