A novel triple-feed I-shaped slot antenna for an RFID tag designed for metallic objects

In this paper, a triple-feed, I-shaped slot RFID tag antenna is proposed. The design methodology as well as simulation results of the proposed RFID tag antenna are also presented . The maximum read range of the three cases implemented with different RFID chips mounted at the designed locations, have been found to be 3.6 m, 3.2m and 4.8 m with a 1.259 W EIRP and the RFID reader system located in free space. The special design of the proposed RFID tag, can be fabricated by directly punching out an I-shaped slot in a metallic foil or a plate, and then combined with one of the three RFID chips with different characteristics. The RFID tag, so designed can be directly mounted on objects made with metal plate. An important advantage of the design is that the RFID tag does not require an increase in the thickness as a conventional tag could to isolate it from metallic objects.