A Comb-shaped Corrugated Antipodal Vivaldi Antenna with a Parasitic Patch for UWB Application

This paper presents a performance comparison of a comb-shaped Vivaldi antenna for ultrawideband (UWB) applications, which is antipodal in nature. The antenna utilizes a $50 \Omega$ microstrip feed line for energizing the antenna. To achieve ultrawide-band behavior, a parasitic elliptical-shaped patch and corrugated slots are employed. The patch controls frequency shifting along with high-gain behavior via electromagnetic coupling. To validate the proposed antenna, Rogers RT5880 substrate is used $\left(\varepsilon_{r}=2.2\right.$, tan $\left.\delta=0.0009\right)$. The proposed antenna operates in a frequency range from 5 to 28 $\mathbf{G H z}$, with the highest gain of 12.5dBi at 27.5GHz. It has a total radiation efficiency of $97 \%$ at 21.25GHz. The proposed Vivaldi antenna is a suitable candidate for high-gain wireless applications. The CST Studio Suite is employed to extract the simulation results of the antenna.