William O. Coburn. “An Ultra-Wideband Absorber Backed Planar Slot Antenna”. Applied Computational Electromagnetics Society Journal (ACES) 32, no. 12 (July 30, 2021): 1129–1131. Accessed April 22, 2026. https://journals.riverpublishers.com/index.php/ACES/article/view/9401.