Passive RFID microstrip antenna sensor for temperature monitoring

In this paper, an ultra-high-speed and high-sensitivity temperature sensor based on a microwave band-stop filter modified with ZnO/MoS 2 /RGO nanocomposite materials is designed and manufactured. The amplitude of the temperature in the environment is determined in the frequency band from 2.73 GHz to 2.76 GHz. The optimized microstrip patch temperature sensor obtains a higher response and better quality factor, which improves the sensitivity of the temperature sensor. In order to study the performance of the temperature sensor, the sensor element modified with molybdenum disulfide (MoS 2 ) sensitive material was placed in the radiosonde detection box, and the temperature level test was realized under the same humidity environment. The measurement results show that the amplitude change of the insertion loss from 0 °C to 200 °C shows a horizontal linear change. In addition, the temperature response recovery time is less than 10 s, and the temperature hysteresis is less than 0.34 °C. This paper also discusses the mechanism of microstrip temperature-sensitive sensing from the perspective of molecular polarization. This provides a simple and easy method for realizing a high-sensitivity, fast-response microstrip temperature sensor. • RFID sensors are very effective for real-time temperature monitoring. • The proposed sensor is a passive chip - less RFID sensor. • The transition metal compound sensor has low cost and is easy to popularize.