M. H. Ariff, M. Y. Hisyam, M. Z. Ibrahim, S. hisyam@ump.edu.my Khatun, I. Ismarani, and N. Shamsuddin, “Circular Microstrip Patch Antenna for UHF RFID Reader”, JTEC, vol. 10, no. 1-2, pp. 61–65, Jan. 2018.