Measurement techniques for permeability, permittivity and EMI shielding: a review

With the advent of more sophisticated network analyzers and spectrum analyzers, the ability to fully characterize the constitutive parameters of material over very broad frequency ranges has become feasible with relatively simple fixtures. The paper reviews various methods of measurement and the advantages and limitations of each technique. Newer methods, such as the permeameter and force gradient magnetometer, are examined as well as older approaches such as the VSM and transmission line methods. A brief discussion of shielding measurements and simple models is included. A comprehensive reference list is provided.<>