Microwave permittivity and permeability properties and microwave reflections of ferrite powders

Magnetic powders applications are becoming attractive in electromagnetic shielding interferences in wireless systems. Magnetic powders are also very important in magnetic resonances imaging and as well as the drug delivery applications in biomedical research. As such, a good understanding of the magnetic powders´ microwave responses is crucial in modern technological applications. In this paper we present accurate broad-band data on the real and imaginary parts of permeability and permittivity of Ni_1-x-yCo_xCu_yFe_2-z-dMn_zO₄ and Ni_1-xZn_xFe_2-yMn_yO₄ substrates in the frequency range of 4 to 40 GHz.