Sensing the human body by implanted RFID tags

Starting from the physical evidence that passive RFID systems may be used as self-sensing devices, the feasibility of human monitoring by means of implanted tags is here investigated. The sensing capabilities, the backscattering contrast and the communication link are analyzed considering a specific medical application, i.e. the continuous monitoring of brain edema evolution in patients neurosurgery treated. By using numerical simulations all the significant issues of the passive sensing are here investigated at different frequency bands. Preliminary experimental results with simplified phantoms corroborate the analysis.