Xida Deng, Kai Da Xu, Zhigang Wang, and Bo Yan. 2021. “Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure”. Applied Computational Electromagnetics Society Journal (ACES) 32 (12):1148-51. https://journals.riverpublishers.com/index.php/ACES/article/view/9413.