An Improved Design of UWB Slotted Antipodal Vivaldi Antenna for Through-wall Imaging (TWI) Systems. - Ahmed, Sajjad; Joret, Ariffuddin; Katiran, Norshidah; Abbasi, Muhammad Inam; Khan, Fawad Salam (Periodica Polytechnica: Electrical Engineering & Computer Science, 2025)