Ping Xu, Shengyuan Luo, Yinfeng Xia, Tao Jiang, and Yingsong Li. 2019. “A Low Mutual Coupling Two-Element MIMO Antenna With a Metamaterial Matrix Loading”. The Applied Computational Electromagnetics Society Journal (ACES) 34 (12):1851-56. https://journals.riverpublishers.com/index.php/ACES/article/view/8069.