Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Engineering
Low Frequency Material Characterization Of Thin Substrates In A Coaxial Transmission Line, Lee B. Cole
Low Frequency Material Characterization Of Thin Substrates In A Coaxial Transmission Line, Lee B. Cole
Theses and Dissertations
This research analyzes the complex permittivity and permeability of thin material samples at low frequencies in the presence of large outer air gaps. It uses the modal method developed in previous research to account for the errors introduced to the system by the presence of higher order modes excited by the air gaps. The theoretical scattering parameters returned by the modal method are compared to the measured scattering parameters and the difference between the two is minimized using a complex root search algorithm. The method is tested with samples of a dielectric material and the magnetic material WaveX which respectively …
Electromagnetic Characterization Of Inhomogeneous Media, Marcus A. Sitterly
Electromagnetic Characterization Of Inhomogeneous Media, Marcus A. Sitterly
Theses and Dissertations
Developed two permittivity profile extraction algorithms for inhomogeneous materials. These two algorithms were created using discrete and continuous approaches. The discrete method used a piece-wise constant permittivity assumption that allowed the use of homogeneous wave equations. Using laboratory data and a theoretical formulation, the permittivity of each piece-wise constant layer within the material was extracted using a root search algorithm. The continuous approach solved the problem using inhomogeneous wave equations. These equations were used to extract a linear permittivity profile using laboratory data and a root search.