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Multichip RFID Epidermal Sensor for Body Temperature Monitoring

A dual chip UHF RFID epidermal sensor tag is here proposed for monitoring human body temperature. A multi-mode square loop configuration has been loaded by two orthogonal matching elements whose position and shape are such to simultaneously optimize the reading performance of both ICs. Thanks to the presence of two independent sensors, the device is able to perform differential measurements respect to the body position (the acquisition points are slightly delocalized) and to the external environment. The device is hence a concept of a single heat-flux thermometer to be used to estimate the core temperature of the body.