Effect of the Different End Shapes on the Gain Flatness of the Antipodal Vivaldi Antenna

In this study, effects of the different end shapes on the gain flatness of an Antipodal Vivaldi Antenna (APVA) operating over 3.1-10.6 GHz are investigated. The antenna having an ending with parallel wires is proposed for gain flatness in this study. Numerical studies are performed for four different APVAs having endings in different shapes of elliptical, circular and partially square forms and parallel wires. The best gain flatness is obtained for the antenna having the ending of the parallel wires.