Mohamed M. Elsewe, and Deb Chatterjee. “Mutual Coupling Characterization of Ultra-Wideband U-Slot Microstrip Patch Array Antennas”. The Applied Computational Electromagnetics Society Journal (ACES), vol. 32, no. 12, July 2021, pp. 1164-7, https://journals.riverpublishers.com/index.php/ACES/article/view/9421.