ZHANG, G. .; WANG, J. .; DOU, Y. .; CUI, H. . Compact Microstrip Lowpass Filter with Ultra-Wide Stopband using Stepped-Impedance Trapezoid Resonators. Applied Computational Electromagnetics Society Journal (ACES), [S. l.], v. 29, n. 04, p. 335–339, 2021. Disponível em: https://journals.riverpublishers.com/index.php/ACES/article/view/11043. Acesso em: 13 may. 2026.