Lin, Y.-F. ., Kao, Y.-C. ., Chen, H.-M. ., & Pan, S.-C. . (2022). Bidirectional Radiated Circularly Polarized Annular-Ring Slot Antenna for Portable RFID Reader. Applied Computational Electromagnetics Society Journal (ACES), 25(3), 182–189. Retrieved from https://journals.riverpublishers.com/index.php/ACES/article/view/15603