The
major challenge in the design of implantable tags is to establish a
convenient communication link by using a reader power that is
compliant with local emission regulation. Fig. 5 shows the
minimum power (estimated by numerical simulations3) that is
requested to the UHF RFID reader to activate (turn-on) a small
dipole tag implanted, in different positions, into an homogeneous
(muscle-like) phantomresembling the human body, interrogated
by a 5-dB gain PIFA antenna