▎ 摘　　要

NOVELTY - Simulation and preparation of double-layer ultra-wide band thin type wave-absorbing metamaterial comprises adding polyvinyl alcohol powder into water, cold water stirring, water bath heating, stirring, adding graphene powder, and stirring to obtain suspension; spraying release agent on a glass plate, drying, taking out, covering layer of glass fiber, placing paper honeycomb plate on the glass fiber, pressing a piece of glass plate, drying, bonding paper honeycomb plate and glass fiber together, and uncovering the whole from the glass plate to obtain lower honeycomb plate mold; filling the suspension to lower layer structure, drying for 15 minutes, and repeating process; filling the suspension to upper layer structure, drying, and repeating process; compounding lower and upper layer absorbing materials; and testing wave-absorbing performance, obtaining reflection loss curve, comparing with simulation result, and verifying microwave effective absorption effect. USE - The method is used for simulating nd preparing double-layer ultra-wide band thin type wave-absorbing metamaterial. ADVANTAGE - The method is simple, has high preparation efficiency, and wide effective absorption bandwidth and does not need special equipment. DETAILED DESCRIPTION - Simulation and preparation of double-layer ultra-wide band thin type wave-absorbing metamaterial comprises: (A) adding polyvinyl alcohol powder into purified water, cold water stirring for 1.5 hours, water bath heating at 80 degrees C, stirring, adding graphene powder, and stirring for 5 hours at 400-500 revolutions/minute (rpm) in a ball mill to obtain suspension; (B) spraying release agent on a glass plate, drying at 170 degrees C for 15 minutes, taking out, covering a layer of glass fiber, placing the paper honeycomb plate on the glass fiber, pressing a piece of glass plate, drying at 120 degrees C for 90 minutes, completely bonding the paper honeycomb plate and glass fiber together, and uncovering the whole from the glass plate to obtain lower honeycomb plate mold; (C) filling the suspension to the designed lower layer structure to the lower layer honeycomb plate mold, drying for 15 minutes at 50 degrees C, and repeating process for 2-3 times until the dried honeycomb structure is completely filled; (D) filling the suspension to the designed upper layer structure into the upper honeycomb plate mold, drying for 15 minutes at 50 degrees C, and repeating process for 2-3 times until the dried honey comb structure is completely filled; (E) compounding lower and upper layer absorbing materials; and (F) testing wave-absorbing performance, obtaining reflection loss curve, comparing with the simulation result, and verifying the microwave effective absorption effect.