Modifications on an Antipodal Vivaldi Antenna for 5G, ISM, Multiband or UWB Operation

In this paper, we propose a modification in the design of an Antipodal Vivaldi Antenna (AVA) to achieve applications on multi-band, mid-band, wide-band, and ultra-wide-band (UWB). Designed on a RT/duroid 5880 laminate (dielectric constant 2.2) of thickness 0.787 mm, the original antenna was conceived to meet the requirements of technologies 5G and ISM, as well as UWB applications. The modified AVA was designed by introducing notches on the inner exponential shape of the original AVA only on the top side. A parametric analysis of the notches dimensions shows how the antenna can be modified from a UWB to a narrowband, passing by a multi-band frequency behavior. Results also show that the approach presented here has almost no effect on the original electromagnetic performance such as radiation patterns and gain of the new antenna in comparison with the original AVA. Simulations were carried out with HFSS ANSYS software.