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A novel chipless RFID humidity sensor based on a finite Artificial ImpedanceSurface (AIS) is presented. The unit cell of the AIS is composed of threeconcentric loops thus obtaining three deep and high Q nulls in theelectromagnetic response of the tag. The wireless sensor is fabricated usinglow-cost inkjet printing technology on a thin sheet of commercial coated paper.The patterned surface is placed on a metal backed cardboard layer. The relativehumidity information is encoded in the frequency shift of the resonance peaks.Varying the relative humidity level from 50% to 90%, the frequency shift hasproven to be up to 270MHz. The position of the resonance peaks has beencorrelated to the relative humidity level of the environment on the basis of ahigh number of measurements performed in a climatic chamber, specificallydesigned for RF measurements of the sensor. A very low error probability of theproposed sensor is demonstrated when the device is used with a 10% RH humiditylevel discrimination.

An Inkjet Printed Chipless RFID Sensor for Wireless Humidity Monitoring