Enhancement in Gain of a compact UWB Vivaldi antenna by using zero index metamaterial array

In this paper, a compact zero index metamaterial integrated vivaldi antenna having UWB characteristics is presented. The proposed antenna exhibits higher gain due to the addition of meandered shaped anisotropic zero index metamaterials (AZIM) cells. The overall size of the proposed antenna is 23×26 mm
²
which is suitable for UWB applications. Moreover the antenna has a peak gain of 5.5 dBi, group delay profile is within 1ns and has a stable radiation characteristics.