微量碳纤维平行排布吸波材料结构模型(Ⅰ)

提出了一种雷达波频段内碳纤维结构吸波材料微量碳纤维平行排布的吸波模型。初步确立了碳纤维平行排布时不同影响参量:电场的入射方向、碳纤维的间距、孔数、碳纤维周围介质的电磁参数变化等与吸波性能的关系,并探讨了这种排布方式的吸波机理。结果表明,微量碳纤维吸波材料只在电场方向与纤维平行方向呈单峰吸收。不同间距的排布有自己的特征吸收频率,纤维支数增加吸波性能增强,碳纤维周围介质的电磁参数对吸波效果有重要影响。同时表明这种吸波材料是一种电阻损耗性吸渡材料。相关研究用此模型可获得较为满意的解释。

Model of microwave absorbing materials based on parallel- arranged carbon fiber

A microwave absorbing model of Cf /Epoxy composites with a small quantity of carbon fiber parallel arranged was suggested. It is established that the relations between the reflection loss and the influence factors such as the incidence direction of electric field, the distance between two parallel carbon fibers, the counts of carbon fibers, the electromagnetic charac-ters of mediums around carbon fibers, etc. The microwave absorbing mechanism of the composite is discussed. There is one absorbing peak in the graph of reflection loss when the incidence direction of electric field is parallel to the orientation of carbon fibers. When carbon fiber distances are different, the composites have the reflection loss in particular frequency. The more the counts of carbon fibers are, the more the dB of reflection loss is. If proper contents of ferrite are added in the e-poxy, it can enhance the reflection loss of microwave. The energy of electromagnetic wave is transited as the heat by resis-tance loss. This model can explain most results obtained in our previous research.