Ultrathin low cost Electromagnetic Band Gap (EBG) materials as UHF RFID tag substrate

Passive UHF (ultra high frequency) RFID (radio frequency identification) is a promising technology for products tracking in logistics. However, the UHF RFID tag is greatly affected by backside goods especially metallic objects. In this paper, we introduce a new technique to insulate the UHF RFID tag from backside objects. An electromagnetic band gap (EBG) material which is a good electromagnetic wave insulator is prepared as RFID tag substrate. With this substrate, the measurement results shows that the UHF RFID tag still can be read with high speed even on the metallic objects within a short range (0.5 m).