Design of a low-power temperature sensing tag based on RFID

Abstract

Designing a low-power RFID enabled sensor for detecting temperature is the main aim of this paper. The functionality of this sensor is hinged on the fact that temperature change leads to the bending of the structural beams which causes displacement of the plate resulting in a change in the capacitance. This means that the RFID tags resonant frequency is influenced by the sensor capacitance variation. The frequency shift can be detected and measured by UHF RFID readers that operate in the range of 900–930 MHZ band, then the temperature change can also be measured. In this paper, a tag is employed and the aim is to make a low-cost, low-power and efficient sensor that is able to function in many environmental conditions. The efficiency of operations in the cold supply chain can be made much better by pervasive sensing of the temperature.