Study on wave-absorbing performance of special embedded-shaped honeycomb structured graphene/polymer composites

With the rapid advancement of anti-stealth technology and the increasing demand for electronic reliability, graphene/polymer nanocomposites have garnered significant attention in the field of multifunctional integrated microwave absorbing materials, owing to their excellent microwave absorption, thermal conductivity, and mechanical properties. However, achieving satisfactory absorption performance and effective broadband absorption in the low-frequency range through material optimization alone remains challenging. By integrating the advantages of material-based absorption and structural absorption, a novel type of special embedded-shaped graphene/polymer nanocomposite honeycomb structure is proposed. Based on effective medium theory, the influence of the interfacial effect and resonance effects on the absorption performance of graphene/polymer nanocomposites is discussed. Through numerical simulation, the impacts of geometric parameters for the irregular honeycomb structure on absorption performance are also investigated. The results demonstrate that the optimal microwave absorption performance of the structure is jointly governed by the polarization relaxation resonance of the graphene/polymer composites and the resonance effect of the special embedded honeycomb structure. At a structural height of 15 mm, the absorption bandwidth reaches 14.2 GHz, accompanied by a minimum reflection loss of −47.8 dB at approximately 4.5 GHz.