The improved technique of electric and magnetic parameters measurements of powdered materials

This paper presents the measurement technique that allows to determine the relative permittivity and permeability of powdered materials. Measurements are realized in a coaxial transmission line which guarantees the broad band frequency characterization. Calculations utilize the scattering matrix parameters of the two-port formed by the sample of powdered material supported by two dielectric walls. The proposed measurement procedure is demonstrated in the example of ferrite powder – Yiitrium Garnet YIG class ferrite for which the relative permittivity (ε′,ε″)(ε′,ε″) and permeability (μ′,μ″)(μ′,μ″) are determined in the frequency range of 200–1200 MHz.

► We investigated powdered Yiitrium Garnet ferrite.
► The explicit determination of scattering parameters of powdered sample.
► Proposed attempt to solve a multivalued logarithm.
► Values of relative complex permittivity and permeability in frequency range from 200 MHz to 1200 MHz.