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August 2, 2026SensorsOpen Access

A Derivative Approach to Permittivity Extraction from Free-Space S-Parameters Measurements

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Authors

GBG. BartolucciGCGiovanni CapocciaRMR. Marcelli

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Overview

Randomized trial demonstrates an innovative method for permittivity extraction in dielectric materials, suggesting advancements in materials science.

Key Points

  • This work aims to develop a contactless method for determining the permittivity of dielectric materials using free-space S-parameters measurements.
  • Measured S-parameters using two patch antennas separated by 15 cm and a Keysight P9375A Vector Network Analyzer.
  • Computed the frequency derivative of the transmission coefficient through a local polynomial fit.
  • Extracted real permittivity values for PMMA, dry sand, and mineral oil.
  • Real permittivity values for PMMA were εr ≈ 3.31, for dry sand εr ≈ 3.59, and for mineral oil εr ≈ 1.85.
  • Permittivity values are consistent with existing literature, confirming the method's reliability.

Cite This Study

Bartolucci et al. (2026) studied this question.

synapsesocial.com/papers/6a6eeae61b0468a7eeab38e2https://doi.org/10.3390/s26154832
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