▎ 摘　　要

Reduced graphene oxide (RGO) was prepared by the oxidation-reduction method. Cobalt nanoparticles were coated on the surfaces of the graphene sheets by using a chemical plating method. The complex relative permittivity and permeability in the frequency range of 2-18 GHz were measured by using a vector network analyzer. The reflection loss curves of the materials were calculated using computer simulation. The simulated results showed that the reflection loss of Co/RGO was stronger than that of RGO. The maximum absorption peaks shifted to lower frequency region as the thickness increased. The reflection loss greater than -10 dB over a wide frequency range 12.5-17.5 GHz and the maximum absorption peak was -12.5 dB at 15.5 GHz at a thickness of 2 mm.