Abstract
Several recent works highlighted that metamaterial-based antennas are capable to function similar to large printed antennas. This paper presents a novel split-ring resonator-based UHF RFID tag antenna with photonic bandgap structure on metallic objects for high gain, which consists of two symmetrical C-shaped resonators with outer strip lines to feed split-ring resonator structure through implementing an inductively coupled feed approach placed on the top surface of Polytetrafluoroethylene substrate. The simulation results were verified by the presented method via enhancing the performance of tag antennas for metallic object.