Zhang, G. ., Wang, J. ., Dou, Y. . and Cui, H. . (2021) “Compact Microstrip Lowpass Filter with Ultra-Wide Stopband using Stepped-Impedance Trapezoid Resonators”, Applied Computational Electromagnetics Society Journal (ACES), 29(04), pp. 335–339. Available at: https://journals.riverpublishers.com/index.php/ACES/article/view/11043 (Accessed: 13 May 2026).