▎ 摘　　要

Using a combination of Ag-coated hollow glass spheres (HGS@Ag) and a small quantity of graphene sheets within the epoxy matrix, we have prepared a novel lightweight high efficiency microwave absorption composite. Compared with pure HGS@Ag and graphene composite, the 10 dB absorption bandwidth and the minimum reflection loss of the novel composite are improved. Reflection loss exceeding 20 dB is obtained for composites in a wide frequency range and the minimum reflection loss reaches 46 dB while bandwidth less than 10 dB can reach up to 4.1GHz when an appropriate absorber thickness between 2 and 3.5mm is chosen. The enhanced microwave absorption performance of the novel composite is due to the enhanced dielectric response, enhanced conductivity, and the trap of electromagnetic radiation with increased propagation paths by multiple reflections. (C) 2015 AIP Publishing LLC.