Reflectivity of Hybrid Microwave Absorbers Based on NiZn Ferrite and Carbon Black

Abstract: This study had as main objective to show that the adequate combination of magnetic and dielectric particles can improve the radar absorbing materials performance. For this, formulations of polyurethane resin loaded with carbon black and NiZn ferrite, with general composition MFe2O4, where M = Ni, Zn or both elements, homogenized by conventional mechanical mixture, were prepared. Reflectivity measurements of different coating formulations applied on aluminum flat plates (l.0 ± 0.l mm-thickness) were performed using the Naval Research laboratory arch technique, in the X-band frequency...