Ying Jiang Guo, Kai Da Xu, and Xiao Hong Tang. “Multi-Functional Ultra-Wideband Monopole Antenna With High Frequency Selectivity”. Applied Computational Electromagnetics Society Journal (ACES), vol. 33, no. 01, July 2021, pp. 37-42, https://journals.riverpublishers.com/index.php/ACES/article/view/9323.