Ultra-wideband (UWB) antennas have numerous advantages compared to their narrow-band counterparts.
They can significantly reduce the footprint of a system by replacing multiple antennas traditionally needed to cover numerous bands. For imaging and sensing, the dataquality can be improved since a wider band corresponds to a higher information content. For defense applications, UWB communication is desirable as the system can continue to function when a specific frequency band is jammed.
We have designed an UWB Vivaldi antenna with high gain performance across the 2.5-57 GHz band by employing a pseudoelement to enhance directivity, notched flares to reduce sidelobe levels, and corrugations to reduce backlobe levels. Maximum and minimum gains of 16 and 4 dB are achieved, respectively, across the band. A larger bandwidth (22.8:1) and higher peak gain is presented when compared to similar UWB tapered slot antennas. The antenna offers directive radiation patterns with a narrow HPBW. The antenna design can be seen in figure 1 and the simulated/measured endfire gain can be seen in figure 2.
E. Yetisir, J. T. Li and N. Ghalichechian, “UWB Dual-polarized Dipole Array with Dielectric and FSS Superstrate and 65° Scanning ,” IET Microwaves, Antennas & Propagation, 2018.
J. Eichenberger, E. Yetisir and N. Ghalichechian, "Antipodal UWB Vivaldi Antenna with Pseudoelement and Notched Flares for 2.5-57 GHz Applications," 2018 IEEE International Symposium on Antennas and Propagation (APS URSI), Boston, MA, 2018.