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Passive UHF RFID Tag for Multispectral Assessment.

Pablo Escobedo1, Miguel A Carvajal2, Luis F Capitán-Vallvey3

  • 1ECsens, CITIC-UGR, Department of Electronic and Computer Technology, ETSIIT University of Granada, Granada E-18071, Spain. pabloescobedo@ugr.es.

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Summary
This summary is machine-generated.

This study introduces a battery-free radio frequency identification (RFID) tag with optical sensing. The flexible, printed RFID tag can detect light across UV to infrared spectrums for various applications.

Keywords:
microcontrolleroptical sensorpassive RFID tagprinted electronicsscreen printingspectral fingerprint

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Area of Science:

  • * Materials Science and Engineering
  • * Electrical Engineering
  • * Sensors and Instrumentation

Background:

  • * Traditional radio frequency identification (RFID) tags are primarily used for identification and tracking.
  • * Integrating sensing capabilities into passive RFID tags can expand their functionality for remote monitoring.
  • * Existing multi-spectral sensing solutions often require active power sources, limiting their applicability.

Purpose of the Study:

  • * To design, fabricate, and characterize a novel passive RFID tag with integrated optical sensing.
  • * To enable spectral fingerprinting of electromagnetic radiation from ultraviolet to infrared without a battery.
  • * To demonstrate the tag's utility in real-world applications like color analysis and ripeness monitoring.

Main Methods:

  • * Screen-printing of antenna and circuit connections on a flexible polymeric substrate.
  • * Integration of five photodiodes for broad spectral range detection (UV to near-infrared).
  • * Implementation of an ultra-low-power microcontroller-based switch for sensor data acquisition.

Main Results:

  • * Successful fabrication of a passive, multi-spectral optical sensing RFID tag.
  • * Demonstration of spectral fingerprinting capabilities across UV, visible, and near-infrared regions.
  • * Validation of the system through color chart measurements and fruit ripening sensing.

Conclusions:

  • * The developed passive RFID tag offers a versatile, low-power solution for multi-spectral optical sensing.
  • * This technology enables battery-free spectral analysis and remote monitoring applications.
  • * The flexible, printed nature of the tag allows for integration into diverse objects and environments.