, A. Q. D. S. M. A. S. B. Donut Shaped Ultra wideband Antenna for Cognitive Radio Application. International Journal on Recent and Innovation Trends in Computing and Communication, [S. l.], v. 5, n. 6, p. 1017 –, 2017. DOI: 10.17762/ijritcc.v5i6.892. Disponível em: https://ijritcc.org/index.php/ijritcc/article/view/892. Acesso em: 7 may. 2024.