Harmonic RFID Temperature Sensor Design for Harsh Environments

This letter presents a new passive sensor for temperature measurements based on a harmonic radio-frequency identification (RFID) tag that uses the temperature sensitivity of Schottky diodes as the main component for the generation of harmonics. The design of the harmonic sensor is based on the fact that the diode is a nonlinear device that when excited at one fundamental frequency generates harmonics of that signal. In this case, the generation mechanism is sensitive to temperature due to the diode thermal voltage variation with temperature. Measurements prove the performance of the sensor.