Yang, Li, Yang Hongchun, Wang Yawei, and Xiao Shaoqiu. 2021. “Ultra-Wideband Bandpass Filter Based on Parallel-Coupled Microstrip Lines and Defected Ground Structure”. Applied Computational Electromagnetics Society Journal (ACES) 28 (01):21-26. https://journals.riverpublishers.com/index.php/ACES/article/view/11695.