Akbari, M. ., R. . Movahedinia, and A. . Sebak. “Ultra-Wideband Antenna With Variable Notch Band Function by Defected Ground Structure and Shorting Pin”. Applied Computational Electromagnetics Society Journal (ACES), vol. 29, no. 06, Sept. 2021, pp. 452-9, https://journals.riverpublishers.com/index.php/ACES/article/view/10979.