Performance Enhancement of Microstrip Hairpin Band Pass Filter Using Dumbbell DGS and Split Ring Resonator DGS . International Journal of Information and Electronics Engineering, [S. l.], v. 1, n. 1, p. 59–64, 2021. Disponível em: https://ijiee.org/index.php/ijiee/article/view/11. Acesso em: 16 sep. 2026.