In this work, an UHF RFID tag integrated with an Inertial Measurement Unit (IMU) sensor has been designed, realized, and tested. It leverages on a specific RFID chip provided with both wireless and wired memory access. High robustness, effectiveness, and working range, are assured through the use of an on-board battery to boost the chip sensitivity and to supply an ultra-low power microcontroller and the sensors. In such a context, specific electromagnetic aspects have been faced to insulate the battery from the radiofrequency (RF) circuitry and a Planar Inverted-F Antenna (PIFA) has been designed to match the RFID chip input impedance. Different devices have been realized, tested, and then applied on specific human body segments to feed a virtual human-body biomechanical model and validate the RFID-based approach.
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