Integrated sensor for humidity, temperature, light, and carbon dioxide based on passive RFID

Abstract

In recent years, radio frequency identification (RFID) technology has been widely used in smart agriculture. In order to measure the multi-dimensional environmental information during the planting of agricultural products, this paper proposes an integrated humid temperature phosgene (HTLC) sensor based on passive RFID. The structure is optimized by the HFSS software and the multi-dimensional integrated sensor is prepared by engraving. The passive RFID HTLC multidimensional sensor operates stably at 10–50 %RH, 5–25 ℃, 700–1900 lux and 800–1600 ppm. The frequency shift is 80 MHz at 10–50 %RH and the sensitivity is 2 MHz/%RH. In the temperature range of 5–25 ℃, the amplitude change is 12.58 dB and the sensitivity is 0.63 dB/℃. For 700–1900 lux light, the amplitude variation is 10.03 dB and the sensitivity is 0.02 dB/Lux at room temperature. For CO2 concentrations of 800–1600 ppm, the sensor has an amplitude change of 9.43 dB and a sensitivity of 0.012 dB/ppm. The sensor has the advantages of low cost, fast response, good repeatability and good stability, and can collect and display the parameter information of the crop growth environment in multiple dimensions, making the monitoring and management more accurate and intelligent, and helping to adjust the growth environment of the crop in time, thereby improving the yield of the crop.