Complex permittivity and permeability of barium and strontium ferrite powders in X, KU, and K-band frequency ranges

Accurate results for the complex permittivity, epsi=epsi' - jepsi' and permeability, mu=mu'-jmu' of barium ferrite powder and strontium ferrite powder in the frequency range from 8.0 to 26.5 Ghz is presented. The complex permittivity and permeability are determined via the waveguide transmission/reflection (TR) technique and the waveguide cavity resonator technique at 25 degree Celsius and relative humidity less than 75 %.