Scalar Reflectometer Based Nondestructive Technique for Measuring Complex Permittivity and Permeability

A low cost, scalar reflectometer based method, named "multithickness method" (MTM), is proposed for non-destructively and simultaneously charactering the complex permittivity and permeability of lossy materials via an open-ended coaxial probe (OECP). The spectral domain immitance (SDI) method has been used to theoretically model the OECP-based test setup, followed by the establishment of uncertainty analysis model. A discussion about how to select the multi thicknesses of test sample is also included based on the analysis and our experience. The broadband frequency-swept measurement, supported by the uncertainty analysis, has been conducted on a typical absorbing material under different thicknesses combination conditions. The experiment results agree well with the reference data, which validates the feasibility and effectiveness of this improved technique