Fazel Rangriz Rostami, Gholamreza Moradi, and Reza Sarraf Shirazi. “Dual-Band Wide-Angle Circularly-Polarized Microstrip Antenna by Ferrite Ring Inserted in Its Cavity Domain”. Applied Computational Electromagnetics Society Journal (ACES), vol. 32, no. 01, Aug. 2021, pp. 81-86, https://journals.riverpublishers.com/index.php/ACES/article/view/9779.