Yu, Qiming, Shaobin Liu, Zhengyu Huang, Xiangkun Kong, Yuehong Hu, and Yongdiao Wen. “Gain Enhancement Planar Lens Antenna Based on Wideband Focusing Gradient Meta-Surface”. The Applied Computational Electromagnetics Society Journal (ACES) 36, no. 06 (November 4, 2021): 650–656. Accessed May 8, 2024. https://journals.riverpublishers.com/index.php/ACES/article/view/12061.