Design Study of Normal Mode Helical Antenna with Dual-Frequency and Circular Polarization Used in Mobile. مجلة الهندسة والتنمية المستدامة, [S. l.], v. 17, n. 3, p. 79–93, 2013. Disponível em: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/999.. Acesso em: 18 2024.