Microwave absorbing materials have been becoming a countermeasure and security media for radio environment, and also been becoming the main military force attached by the world. In this study, experimental data, theoretical researches and FEKO-a 3D structure and electromagnetic field analysis simulation tool, namely, FEldberechnung bei Korpern mit beliebiger Oberflache, are effectively combined. Through systematic studies on electromagnetic parameters and microwave absorbing properties of high-performance absorbing functional particle Fe 3 O 4 -rGO (i.e. reduced graphene oxide), single-layer composite Fe 3 O 4 -rGO@EP/GF (epoxy/glass fiber) and multi-layer structure composite Fe 3 O 4 -rGO@EP/fiber, combined with the simulation calculations of material structures, design on the microwave absorption performances of fiber/resin structural composites is achieved. In particular, under the guidance of FEKO simulations, a multi-layer structure composite with two layers of Fe 3 O 4 -rGO@EP/GF with different Fe 3 O 4 -rGO added amounts as the absorbing layer and carbon fiber (CF) reinforced EP as the reflecting layer is prepared, which has an effective absorption bandwidth of 8. 43-12.40 GHz, almost covering the whole X-band, and RL min (minimum reflection loss) up to −34.60 dB at 10.37 GHz. The relevant experimental results are basically consistent with the FEKO simulation results. This study is helpful to improve the developing efficiencies and properties of microwave absorbing structure composites with both excellent mechanical properties and outstanding microwave absorbing performances, especially conducive to industrial productions. absorption intensity was −31.0 dB at −9.9 GHz. Se-Won Eun et al [2] produced the tested material glass/EP-MWCNT and introduced the 'split sample' test method, which, used to measure the reflection and absorption to electromagnetic waves, could analyze quantitatively the effects of layering by implementing layering with different thickness and position in the same sample, test results showed that the minimum reflection loss (RL min ) of the material prepared was −52.9 dB, resonance occurring at 10.01 GHz, and the effective absorption bandwidth was 8.3-12.4 GHz, almost covering the whole X-band. In addition, the effects of fiber lamination angle [3], pulp modification degree [4,5] and special hollow fiber [6] on the microwave absorbing properties of composites were studied too. used self-assembly technology to manufacture broadband periodic structural absorbing material with GO solution and PP fabric, through coupling multiple resonances and edge diffraction, the periodic structure absorbing material prepared had more than 90% absorption in the whole measurement frequency range (2-40 GHz, 75-110 GHz); in addition, it showed high absorption intensity (RL <−15 dB) over a wide frequency range (62.73 GHz). Wei-Li Song et al [8] accelerated the design of highefficiency microwave absorbing dielectric composites by allowing attenuation evaluation diagrams; based on this, combined with CST simul...
