Li, J., F. Wang, G. Wen, Y. Huang, and W. Zhu. “Planar Metamaterial for Matched Waveguide Termination”. Applied Computational Electromagnetics Society Journal (ACES) 28, no. 12 (September 19, 2021): 1236–1243. Accessed October 20, 2024. https://journals.riverpublishers.com/index.php/ACES/article/view/11257.