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A new method accurately determines complex permittivity for lossy materials using a one-port coaxial transmission line. This technique validates dielectric properties of liquids and soil across a broad frequency range.

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Area of Science:

  • Electromagnetics and Microwave Engineering
  • Materials Science

Background:

  • Accurate characterization of complex permittivity is crucial for understanding dielectric material properties.
  • Traditional methods for complex permittivity inversion can be complex and require specialized equipment.

Purpose of the Study:

  • To present a novel technique for complex permittivity inversion using a one-port coaxial transmission line sample holder.
  • To enable accurate and broadband characterization of dielectric materials, including lossy substances.

Main Methods:

  • Utilizing a non-linear least-squares procedure to solve the scattering equation for complex permittivity.
  • Employing a one-port closed coaxial transmission line sample holder for measurements.
  • Focusing the inversion method on the reflection coefficient of the test material.

Main Results:

  • Accurate retrieval of complex permittivity for low- and high-permittivity dielectric materials between 1 GHz and 3 GHz.
  • Successful characterization of liquids (ethanol, methanol, TX100) and Bajjad soil.
  • Validation of results against previously published data from two-port measurement setups.

Conclusions:

  • The proposed one-port inversion method provides a reliable approach for complex permittivity determination.
  • The technique is versatile, applicable to various materials including liquids and soils.
  • Experimental validation confirms the accuracy and broadband capabilities of the developed method.