Electromagnetic material characterization of a PEC backed lossy simple media using a rectangular waveguide resonant slot technique

Electromagnetic material characterization is the process of determining the complex constitutive parameters of a certain media. The motivation here is the development of a non-destructive material characterization technique for a lossy, simple media (linear, homogeneous and isotropic) backed by a perfect electric conductor (PEC). In order to extract both the permittivity and permeability of the media, two independent experimental interrogations of the material are required. For a rectangular waveguide the experimental interrogations take the form of either reflection or transmission coefficients. The experimental data is then compared iteratively to the formulation, resulting in the extraction of the complex constitutive parameters for the media.; This dissertation will demonstrate, through the use of a transverse slot cut in the bottom wall of a rectangular waveguide, how waveguide scattering parameters are used to effectively extract both the permittivity and permeability of a lossy simple media backed by a PEC. A two-dimensional Newton's complex root search algorithm is used to iteratively solve for the complex constitutive parameters. Results for a magnetic radar absorbing material are compared to measurements using a partially-filled rectangular waveguide technique to verify the formulation.