Microwave propagation parameters in magnetic fluids.

Complex dielectric permittivity and complex magnetic permeability measurements of two magnetic fluids (as microwave propagation media), in the approximate range 0.2-5 GHz were performed. The two samples consisted of magnetite nanoparticles, dispersed in kerosene and in water, respectively. Based on the dielectric and magnetic measurements, the frequency (f ) dependence of the attenuation parameter, [Formula: see text], the phase constant, [Formula: see text], the propagation constant, [Formula: see text], the intrinsic impedance, Z(m), the refractive index, n, the reflection coefficient, R, the wavelength, [Formula: see text] and the skin depth, [Formula: see text], of the investigated samples were determined.