A Novel Temperature Sensor Based on Chipless RFID Tags

A novel temperature sensor that does not use external temperature-sensitive materials but employs the characteristics of a dielectric substrate to sense temperature changes is proposed. The sensor is based on chipless RFID tags which can remotely and wirelessly detect the temperature. The effect of temperature on the RFID substrate is investigated and it is found that the dielectric constant of the substrate decreases as the temperature rises. The specific design process of chipless RFID is presented and different antenna structures are simulated and compared. Finally, the simulation results of the design under different temperature changes are given. The sensor uses multiple C-shaped scatterers, which can include more sensitive properties of the substrate to detect the temperature change. As the temperature changes, the position of the formant of the backscattered signal will shift, so that the sensor can be designed based on the relationship between the temperature change and the shift of the formant.