Time Domain Measurement of Material Permittivity and Permeability
Accurate knowledge of material complex relative permittivity (ε r = ε r ′ − jε r ″) and permeability (μ r = μ r ′ − jμ r ″) is required for just about any application utilizing the electromagnetic properties of materials. Applications that need precise information of the frequency dependence of ε r and μ r include design of radar absorbing material and RAM geometry, design of transmission line circuits on microwave substrates, and simulation and analysis of the propagation of electromagnetic waves in and through complex media. Frequency domain measurement of material properties are well known, and can be accomplished in a number of ways. These include lumped circuit and balanced bridge methods at low frequencies, and waveguide, TEM transmission line and resonant cavity methods for high frequencies1,2, and optical techniques. A comprehensive overview of material electromagnetic properties measurement techniques was recently presented by Afsar3. These techniques typically are conducted at low voltage and low electric field strengths, and assume that the material properties are independent of the field strength.
KeywordsReflection Coefficient Relative Permeability Time Domain Measurement Frequency Domain Measurement Material Permittivity
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