ZEAIN, M. Y.; ABU, M.; ZABRI, S. Investigation of Printed Helical Antenna Using Varied Materials for Ultra-wide band Frequency. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), [S. l.], v. 10, n. 2-7, p. 137–142, 2018. Disponível em: https://jtec.utem.edu.my/jtec/article/view/4441. Acesso em: 21 dec. 2024.