Ma, Y., W. Che, W. Feng, and J.-X. Chen. “Square Dual-Mode Quasi-Elliptic Bandpass Filter With Wide Upper Stopband”. Applied Computational Electromagnetics Society Journal (ACES) 28, no. 11 (September 27, 2021): 1056–1060. Accessed May 13, 2026. https://journals.riverpublishers.com/index.php/ACES/article/view/11315.