Permittivity and permeability determination for high index specimens using partially filled shorted rectangular waveguides

TL;DR

This paper introduces a novel method to accurately determine the permittivity and permeability tensors of high index, variable shape specimens using reflection measurements in a partially-filled shorted rectangular waveguide, validated with experimental data.

Contribution

The paper presents a new technique for extracting tensor elements of permittivity and permeability from reflection data in a specialized waveguide setup, applicable to high index and dispersive materials.

Findings

Method accurately characterizes high index materials

Validates with measurements from magnetic composites

Handles frequency dispersive specimens

Abstract

A method for determining the permittivity and permeability for specimens with high refractive index and variable shape is investigated. The method extracts the permeability and permittivity tensor elements from reflection measurements made with a partially-filled shorted rectangular waveguide on an electrically small specimen. Measurements are performed for two isotropic, heavily loaded coaxial magnetic composites. Supporting measurements from a stripline cavity and coaxial airline are used to validate the method. The results demonstrate the methods ability to handle frequency dispersive and high index materials.