Jin, D.-L. ., J.-S. . Hong, and H. . Xiong. “A Novel Single-Sided Wideband Metamaterial”. Applied Computational Electromagnetics Society Journal (ACES), vol. 27, no. 12, Nov. 2021, pp. 971-6, https://journals.riverpublishers.com/index.php/ACES/article/view/12277.