Lin, Y.-F. ., Kao, Y.-C. ., Chen, H.-M. . and Pan, S.-C. . (2022) “Bidirectional Radiated Circularly Polarized Annular-Ring Slot Antenna for Portable RFID Reader”, Applied Computational Electromagnetics Society Journal (ACES), 25(3), pp. 182–189. Available at: https://journals.riverpublishers.com/index.php/ACES/article/view/15603 (Accessed: 13 May 2026).