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For wideband RFID systems, a dual-frequency printed folded dipole antenna is designed with a photonic bandgap (PBG) structure carved in the antenna's arms. Simulated results show that this antenna has good return loss characteristic and hemisphere direction radiation characteristic, at two working centre frequencies of 0.90 and 2.24'GHz. Compared to other improved structures, the new PBG structure has special advantages in simplifying the antenna structure. Considering engineering processes, the influences of antenna arm width, dielectric loss, the PBG structure bore size and substrate on the performance of an antenna are particularly studied.