Measurement of complex permittivity and permeability of hexagonal ferrite composite material using a waveguide in microwave band

This paper reports a method for measuring for the complex permittivity and permeability of hexagonal ferrite composite as lossy material. The measurement using a waveguide in the microwave band. In order to measure the S-parameter of hexagonal ferrite, a sample should completely fill in the waveguide end and the sample holder. The complex permittivity and permeability of the hexagonal ferrite composite material are measured using the vector network analyzer (VNA) in the frequency range from 7 to 14 GHz. Their complex permeability and permittivity, magnetic and dielectric loss tangent values were calculated at given thickness according to NRW formula and transmit line method in microwave frequency. The proposed measurement method can be a useful technique for measuring dielectric and magnetic properties of absorbing materials