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Electromagnetic(EM)parameters characterized by the complex permeability(εr=ε'-iε'')and the complex permittivity(μr=μ'-iμ'')and microstructure are important for designing microwave materials to lessen EM pollution[1].Here,EM responses of FeCo/C/CoFe2O4 nanocomposites with unique core double-shells microstructure were investigated in the range of 2-18 GHz by Agilent 8722ES vector network analyzer.