Ultra Wide Band Antipodal Vivaldi Antenna with Tapered Triangular Corrugated Edges

Abstract

In this paper, a tapered triangular corrugated edge antipodal vivaldi antenna (TTCE-AVA) is presented. The total size of the antenna is 49.5 × 57 mm2and it operates in a bandwidth of almost five octaves, from 1.3GHz to 44GHz. The introduced technique will result in ultra-wide bandwidth while having a small size compare to other works. To achieve this, first, a minimum-size conventional antipodal vivaldi antenna (CAVA) is designed, with respect to the tradeoff between the lowest operating frequency and the substrate dielectric constant. Then, the low end operating frequency is extended and the gain over the entire frequency bandwidth was enhanced, by adding two circular-shape loads (CL) to the CAVA. The reflection coefficient of the resulting CL-AVA is then improved, by applying a tapered triangular corrugation at the edges (TTCE) of the circular sections. The resulting TTCE-AVA is manufactured and tested. The simulation and experimental results demonstrate excellent performance in an ultra-wide frequency band from 1.3 to 44 GHz.