A new concept of UHF RFID tag for metallic object tracking with embedded cavity

This paper presents a new solution for labeling metallic items like boxes and cavities. The proposed tag is based on the use of electromagnetic properties of cavities and the passive loop AKTAG RFID tag. Moreover the design avoids the physical connection between the RFID chip and the antenna. Simulation and measurement results are in good agreement. The feasibility of performing hidden tag using existing metallic cavity embedded in the object structure is demonstrated. When the tag is inside the cavity, a read-range of 5.5 m was measured in anechoic chamber, and a read-range of 7.7 m is reached when the loop tag is directly coupled to the slot.