Design and performance analysis of vivaldi antenna at very high frequency

In this article, we suggested the design of a Vivaldi antenna which operates in very high frequencies range in GHz to achieve high performance in terms of bandwidth and directivity. Designed Vivaldi Antenna works in the frequency band of 45-53 GHz. Vivaldi antennas is analysed using CST software to obtain the voltage standing wave ratio (VSWR) characteristic so that one can judge how well designed antenna is impedance matched to the transmission line it is connected to. Obtained VSWR ranges from 1.4 to 2 and high directivity level ranges from 4.9 dBi at 49.75 GHz to 5.2 dBi at 46.25 GHz which shows the progress in directivity and lower frequency range coverage. The proposed Vivaldi antenna displays steady radiation pattern throughout the frequency band. The VSWR characteristic and farfield radiation pattern are plotted to realize the antenna mechanism.