SWITCHED-BEAM ARRAY ANTENNA AT 28 GHZ FOR 5G WIRELESS SYSTEM BASED ON BUTLER MATRIX BEAMFORMING NETWORK. Nigerian Journal of Technology, [S. l.], v. 38, n. 2, p. 484–489, 2019. Disponível em: https://nijotech.com/index.php/nijotech/article/view/1994. Acesso em: 30 apr. 2026.