Ji-Hong Kim, Chang-Hyun Jeong, and Wang-Sang Lee. “Rotated Stacked Yagi Antenna With Circular Polarization for IoT Applications”. The Applied Computational Electromagnetics Society Journal (ACES), vol. 34, no. 08, Aug. 2019, pp. 1246-9, https://journals.riverpublishers.com/index.php/ACES/article/view/8307.