Electromagnetic properties of silica-coated planar anisotropy carbonyl-iron particles in quasimicrowave band

For the sake of thinner electromagnetic wave absorbers used in quasimicrowave band, planar anisotropy carbonyl-iron (PACI) coated with amorphous SiO(2) particles as absorber and paraffin as matrix were prepared. The complex permeability, complex permittivity and microwave absorption properties were investigated in the frequency range of 0.1-18 GHz. Both the real parts of permeability and permittivity are increased with the increasing of PACI/SiO(2) particles volume concentrations. The minimum reflection loss shifts to the low frequency region with increase in PACI/SiO(2) particles volume concentrations. The decrease of matching frequency could be well explained by the increasing of,mu and epsilon. The PACI/SiO(2) core-shell material exhibits great potential in application absorbers in quasimicrowave frequency range.