▎ 摘　　要

The effects of processing parameters on microwave-absorbing properties of innovative reduced graphene oxide paper (RGOP)-based structures are investigated. The fabrication method of RGOP is vacuum filtration, and the important processing parameters include graphene oxide (GO) weight fraction in suspension, sonication time for suspension, and number of layers of RGOP. RGOP is incorporated with either air spacers or glass fabric composites to fabricate RGOP RAS (radar-absorbing structures), and its microwave absorbing-performance is measured by rectangular waveguide method. With air spacer thickness of 4.4 mm, the reflection loss of the RAS increases with the increase in GO weight fraction in suspension up to 1.5 wt%. However, the RGOP20-T15-L6 RAS exhibits better reflection loss of -26.5 dB. Reflection loss of the RAS increases with the increase in sonication time for suspension up to 15 min. The reflection loss of the RAS also increases with the increase in the of number of layers of RGOP up to nine layers. With the use of the glass fabric composite, the RAS possesses better microwave-absorbing properties and is thinner. RGOP20-T15-L9 RAS incorporated with glass fabric composite exhibits reflection loss of -37.4 dB at 11.8 GHz with total thickness of 2.76 mm. The reflection losses of the RGOP RAS are simulated with the measured electromagnetic properties of RGOP using Ansys HFSS, and the results correlate well with experimental data. With the flexible and tailored RGOP, the RGOP RAS is quite suitable for the fabrication of curved 3D microwave-absorbing structures that can be applied to complicated shapes of stealth aircraft or battleships.