Characteristics Analysis of RFID Multiparameter Sensor Tags Based on Various Substrate Materials

Not only are large bridges and structures susceptible to structural collapse owing to mechanical loads, but they are also susceptible to structural degeneration due to insufficient environmental monitoring. Therefore, the monitoring of environmental characteristics must be added to the field of structural health monitoring, which is no longer sufficient if it focuses just on changes in mechanical qualities. In this research, a reversible multiparameter sensor for temperature and humidity detection is developed so that it can be reused to increase economic efficiency. A portable, low-cost vector network analyzer (VNA) is used to detect the change in temperature and humidity by observing the shift of the resonant frequency of the sensor, and the performance of a multiparameter sensor with various substrates is compared and assessed The humidity sensitivity of the sensor is about 1.8 MHz/RH. A linear fit using normalized frequency shift with temperature results in greater temperature sensitivity of 179.23 ppm/°C for the RO3010, proving the sensor’s viability. In addition to identifying various sensors, a 5-bit resonator tag was created for coded identification.