Document Type
Article
Publication Date
11-7-2007
Abstract
In this paper, a nondestructive technique for determining the complex permittivity and permeability of magnetic sheet materials using two flanged rectangular waveguides is presented. The technique extends existing single probe methods by its ability to simultaneously measure reflection and transmission coefficients imperative for extracting both permittivity and permeability over all frequencies. Using Love’s Equivalence Principle, a system of coupled magnetic field integral equations (MFIEs) is formed. Evaluation of one of the two resulting spectral domain integrals via complex plane integration is discussed. The system, solved via the Method of Moments (MoM),yields theoretical values for the reflection and transmission coefficients. These values are compared to measured values and the error minimized using nonlinear least squares to find the complex permittivity and permeability of a material. Measurement results for two magnetic materials are presented and compared to traditional methods for the purpose of validating the new technique. The technique’s sensitivity to uncertainties in material thickness and waveguide alignment is also examined.
DOI
10.2528/PIER07102405
Source Publication
Progress In Electromagnetics Research (ISSN 1070-4698 | eISSN 1559-8985)
Recommended Citation
Hyde, M. W. & Havrilla, M. J. (2007). A Nondestructive technique for determining complex permittivity and permeability of magnetic sheet materials using two flanged rectangular waveguides. Progress In Electromagnetics Research, 79: 367–386
Comments
Co-author Milo Hyde was enrolled in an AFIT PhD program at the time of this article. (AFIT-DEE-ENG-10-12, September 2010 graduation.)