iQ Cavity for Material Permittivity Characterization

TL;DR

This paper introduces a new measurement method combining waveguide experiments, CEM simulations, and genetic algorithms to accurately determine the complex permittivity of low-loss dielectric materials.

Contribution

It presents a novel approach that integrates experimental measurements with computational optimization for material characterization.

Findings

Accurately extracts complex permittivity of low-loss materials.

Effective for low dielectric loss tangent specimens.

Applicable to X-band and UHF waveguides.

Abstract

We present an X-band waveguide (WR90) and UHF waveguide (WR1500) measurement method that permits the extraction of the complex permittivity for low dielectric loss tangent material specimen. The extraction method relies on computational electromagnetic (CEM) simulations; coupled with a genetic algorithm; to fit the experimental measurement and the simulated transmitted scattering parameter (S21) of the TE10 mode through the waveguide with the material specimen partially filling the cross-section. This technique provides the material measurement community with the ability to accurately extract material properties of low-loss material specimen.