Ping Wang, Qi Wu, Yu Shao, and Dong Huang. “A Low Profile Circularly Polarized Antenna Based on Stepped Open-Ended Slot Radiator”. The Applied Computational Electromagnetics Society Journal (ACES) 34, no. 08 (August 1, 2019): 1165–1171. Accessed July 3, 2022. https://journals.riverpublishers.com/index.php/ACES/article/view/8283.