Y ILIYASU, A.; HAMID, M. R.; A RAHIM, M. K.; AMINU-BABA, M.; MOHD YUSOF, M. F. Compact Wideband Frequency Reconfigurable Metamaterial Antenna Design. ELEKTRIKA- Journal of Electrical Engineering, [S. l.], v. 18, n. 1, p. 22–25, 2019. DOI: 10.11113/elektrika.v18n1.145. Disponível em: https://elektrika.utm.my/index.php/ELEKTRIKA_Journal/article/view/145. Acesso em: 21 sep. 2021.