Chung, K. L. ., A. . Cui, M. . Ma, B. . Feng, and Y. . Li. “Central-Symmetry Decoupling Technique for Circularly-Polarized MIMO System of Tightly Packed Chinese-Character Shaped Patch Antennas”. Applied Computational Electromagnetics Society Journal (ACES), vol. 36, no. 09, Nov. 2021, pp. 1125-31, https://journals.riverpublishers.com/index.php/ACES/article/view/12109.