Modified Antipodal Vivaldi Antenna to Gain Enhancement for Ultrawideband Applications

The utilization of the antenna as the supporting device for telecommunication infrastructure is essential, including its function for ultra-wideband (UWB) applications. UWB needs ultra-wideband antennas. One of the antennas is an Antipodal Vivaldi Antenna (AVA). This paper presents a modified AVA to enhance the gain by adding a trapezoidal dielectric director (TDD). The TTD is placed in the direction of wave propagation to amplify receiving of the EM waves. A characteristic of the proposed antenna has been simulated. The result shows that the proposed antenna achieves return loss> 10 dB at the 3.6 GHz - 12 GHz frequency range with a better-matched impedance and more stability. This method also gave a better gain up to 11.81 dBi. This method also helps the antenna reduce a beam split on its main lobe at a high frequency.