Ma, Hui, Jiayuan Lu, Yuran Li, Lin Liu, and Jianpeng Wang. 2021. “Design of a Compact Wideband Balun Bandpass Filter With High Selectivity”. Applied Computational Electromagnetics Society Journal (ACES) 31 (04):396-400. https://journals.riverpublishers.com/index.php/ACES/article/view/10153.