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A High-Sensitivity Inkjet-Printed Flexible Resonator for Monitoring Dielectric Changes in Meat.

Jamal Abounasr1, Mariam El Gharbi1, Raúl Fernández García1

  • 1Department of Electronic Engineering, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain.

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Summary

A new flexible loop antenna sensor accurately monitors meat quality by tracking dielectric property changes. This cost-effective, printable sensor offers real-time, non-invasive food safety insights.

Keywords:
2.4 GHz ISM banddielectric property analysisflexible loop antennainkjet-printed sensormeat freshness monitoringmicrowave resonancenon-invasive monitoringpermittivity-based sensingprinted electronicsreal-time food quality assessment

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Area of Science:

  • Electrical Engineering
  • Food Science
  • Materials Science

Background:

  • Food quality degradation affects dielectric properties.
  • Real-time, non-invasive monitoring is crucial for food safety.
  • Radio Frequency (RF) sensors offer potential for quality assessment.

Purpose of the Study:

  • To develop and validate a flexible loop antenna sensor for real-time meat quality monitoring.
  • To investigate the sensor's performance based on dielectric property changes during meat storage.
  • To assess the sensor's sensitivity, accuracy, precision, and repeatability.

Main Methods:

  • Design and simulation of a flexible loop antenna sensor using CST Microwave Studio 2024.
  • Operation within the 2.4 GHz Industrial, Scientific, and Medical (ISM) band.
  • Experimental validation using five meat samples over a six-day storage period, measuring resonance frequency shifts.

Main Results:

  • The sensor detected consistent frequency shifts from 2.14 GHz (Day 0) to 1.29 GHz (Day 5).
  • Average sensitivity was 0.173 GHz/day, with high correlation between measured and simulated results (R2=0.984 and R2=0.974).
  • Demonstrated high precision and repeatability with low standard deviations.

Conclusions:

  • The flexible loop antenna sensor is a sensitive, accurate, and cost-effective solution for real-time meat quality monitoring.
  • The sensor's design is compact, printable, and scalable for integration into Internet of Things (IoT) platforms.
  • This technology advances non-invasive, RF-based food safety by enabling early detection of spoilage.