CUI, H. .; WANG, J. .; LI, J.-L. . Compact Microstrip Branch-line Coupler with Wideband Harmonic Suppression. Applied Computational Electromagnetics Society Journal (ACES), [S. l.], v. 27, n. 09, p. 766–771, 2021. Disponível em: https://journals.riverpublishers.com/index.php/ACES/article/view/12365. Acesso em: 13 may. 2026.