Design of UHF RFID Z Shaped Slot Patch Tag for Human Monitoring Applications

Abstract

This paper addresses the design of passive new Z shaped slot patch antennas in UHF band (860MHz-960MHz) for radiofrequency identification and sensing applications, insulated from the human body by thin silicone layer, in this case the human skin presents the object to be tagged or bio-tracked, thus providing a poor communications because of the high dielectric properties of human tissues. A new tag structure combining rectangular patch, tow tuning slots and inclined internal slot, which have been optimized for an IC with R=380ohm and C=2.8pF, is here discussed through numerical simulations, using the finite element method via HFSS solver. Finally the achieved antennas designs having different sizes are evaluated utilizing a layered anatomical model of the human body. The simulated performance indicates a possible application of these tags to any part of the body.