A simple methodology to fabricate ultra-porous and lightweight epoxy foam composites loaded with carbon fibers is presented. These materials are proposed for microwave absorbing application. The elaborated composite density can be controlled via proper proportioning of carbon fiber/solvent/surfactant/epoxy components constituting the absorber composites. The influence of the weight percentage of these different components, on the composite structure, is studied. The density of the composites can be reduced to 0.05g‧cm⁻³ while the density of the neat epoxy foam is about 0.12g‧cm⁻³. Dielectric characterization of composites elaborated with low weight percentages of carbon fibers (from 0.0125 wt.% to 0.075 wt.%) is conducted using free space method. The simulation of a multilayer absorber is conducted and predicts a promising absorption performance (reflection coefficient <-10 dB) for the wide studied frequency band; this result was confirmed by the measurement of a multilayer absorber prototype. Finally, these performances are compared to commercial absorber materials having same dimensions.

提出了一种简单的方法来制造碳纤维负载的超多孔和轻质环氧泡沫复合材料。这些材料被建议用于微波吸收应用。可以通过适当比例地构成吸收剂复合材料的碳纤维/溶剂/表面活性剂/环氧树脂组分来控制精细的复合材料密度。研究了这些不同组分的重量百分比对复合结构的影响。复合材料的密度可以降低到0.05g‧cm ^-3而整齐环氧泡沫的密度为约0.12g‧cm ^-3。使用自由空间法进行了低重量百分比的碳纤维（0.0125 wt。％至0.075 wt。％）制成的复合材料的介电表征。进行了多层吸收器的仿真，并预测了在宽的研究频带中有希望的吸收性能（反射系数<-10 dB）；多层吸收器原型的测量结果证实了这一结果。最后，将这些性能与具有相同尺寸的市售吸收材料进行比较。