A Broad-Band, Automated, Stripline Technique for the Simultaneous Measurement of Complex Permittivity and Permeability

A broad-band automated technique for making frequency-swept measurements of complex permittivity and permeability simultaneously is described. Epsilon_r and µ_r are computed from S-parameter measurements made on a strip transmission-line device loaded with the material under test. The derivation of epsilon_r and µ_r as functions of S₁₁ and S₂₁ is included, as well as a practical design for a stripline sample holder. Measured epsilon_r and µ_r data for several dielectrics and ceramic ferrites is also presented. The technique has been found to have an overall accuracy of better than +-5 percent.