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Applications of Chipless RFID Humidity Sensors to Smart Packaging Solutions.

Viviana Mulloni1, Giada Marchi1, Andrea Gaiardo1

  • 1Center for Sensors and Devices, Fondazione Bruno Kessler, 38123 Trento, Italy.

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|May 11, 2024
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Summary

New chipless radio-frequency identification (RFID) humidity sensors offer tunable performance for smart packaging. These flexible, low-cost sensors enable wireless monitoring of humidity levels, enhancing package integrity and product quality.

Keywords:
chipless RFIDhumidity sensingmicrowave sensorsmart packagingthreshold sensor

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Smart packaging integrates technologies like RFID for enhanced functionality.
  • Sensing capabilities, particularly for humidity, are crucial for advanced packaging but are still under development.
  • Existing solutions may lack flexibility, cost-effectiveness, or wireless read-out for humidity monitoring.

Purpose of the Study:

  • To propose novel chipless RFID humidity sensors for smart packaging applications.
  • To introduce a strategy for tuning sensor performance and operating humidity range.
  • To evaluate the sensors' suitability for different packaging integrity and humidity measurement tasks.

Main Methods:

  • Development of flexible, low-cost, chipless RFID sensors.
  • Implementation of a structural parameter adjustment for performance tuning.
  • Utilizing both frequency shift and intensity variation for humidity measurement (double parameter sensing).
  • Wireless read-out of sensor data.

Main Results:

  • Sensors demonstrated adjustable sensitivity and operating humidity ranges.
  • Significant variation in performance characteristics was observed among different sensor configurations.
  • The sensors proved adaptable for both low-humidity threshold detection and complex humidity measurement in non-hermetic packages.

Conclusions:

  • The proposed chipless RFID humidity sensors are viable for smart packaging.
  • Tunable structural parameters allow customization for diverse application requirements.
  • These sensors offer a flexible, cost-effective, and wireless solution for humidity monitoring in packaging.