This work present the fabrication and design of a flexible chipless RFID humidity sensor, which can be used for the low cost humidity monitoring of the intelligent food packaging. With inkjet-printed ink and ion-exchange technique, silver antenna operating at ultra-high frequency with high gain is fabricated on the flexible polyimide (PI). The proposed antenna structure is designed by finite element method (FEM) based Ansys high frequency structure simulator (HFSS). The physical properties of the silver nanoclusters are characterized by the SEM, XRD and AFM techniques. With the integration of the designed silver antenna and the linear dielectric behavior of PI film to humidity, a chipless RFID humidity sensor is developed. The resonance frequency of the chipless RFID sensor is shifted with the environmental humidity, resulting in the variation of the backscattered power level. The sensitivity have been optimized by the antenna design and the fabricated process, leading to the signals can be easily detected by the RFID reader. The developed low cost passive chipless RFID sensor has potential applications for the intelligent food packaging.<br/>

RFID-enabled wireless humidity sensor for food packaging

2019 Fall National Meeting

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