Automatic System to Measure Complex Permittivity and Permeability using Cavity Perturbation Techniques

A cavity perturbation technique suitable for measuring dielectric parameters of various dielectric materials and magnetic parameters of amorphous magnetic wires is discussed. From the shift in the resonant frequency and the Q-value, the complex permeability of the material can be calculated. Three different methods to determine the resonant frequency and the quality factor from complex transmission coefficient are used and compared to find which is most accurate and precise when tested using identical materials.