▎ 摘　　要

In this paper, a high-efficiency microwave absorbing material has been prepared through a combination of doped polyaniline (PANI)-coated porous-structure carbonyl iron powder (CIP) and a small amount of graphene sheets within bisphenol F epoxy resin. The reflection loss (RL) performance of these composites has been evaluated by electromagnetic attenuation and impedance matching. Compared to compact iron particles, the porous-structure carbonyl iron particles have a higher complex permittivity and permeability that are closely related to their microstructures. The -10 dB absorption bandwidth and the minimum RL of the composite material showed improvement in comparison to the pure graphene sheets composite. The minimum reflection loss reached -45 dB at a thickness of 3.5 mm while the bandwidth with less than -10 dB RL reached up to 4.6 GHz in the range of 10.3 GHz to 15 GHz, with a matching thickness of 2 mm. The improved microwave absorption performance of the hybrid composite is due to the interfacial polarization, enhanced conductivity, and loss of the electromagnetic radiation through increased transmission routes due to multiple reflection.