Characteristics of Composite Electromagnetic Wave Absorber Made of Ni-Zn Ferrite and Isolated SiO2 Particles

It is found through simulation study that electromagnetic wave absorbers made of composites of Ni-Zn ferrite and SiO2 particles, which are isolated in the continuous medium of Ni-Zn ferrite, show absorption in the frequency regions both below and above 1 GHz. The spray method is proposed to realize such composites in this study. It is confirmed by XRD and electromagnetic characteristics that thin films of Ni-Zn ferrite can be coated on the surfaces of SiO2 particles by the spray thin film deposition method and the measured complex permeability is close to that calculated using the isolation model of SiO2 particles in the Ni-Zn ferrite medium.