Effects Of Carbon Fiber Arrangements On Microwave Absorbing Properties Of Structural Composites And Mechanics Discussions

A series of radar absorbing materials were prepared by using laminating techniques.The absorbing properties of these composites in which carbon fibers were embeddedin parellel, orthogonal or vertical and that carbon fiber felts were arranged incapacitive or perceptual mode were researched systematically. Based on the resultsabove, vertical-arranged carbon fibers and perceptual-arranged carbon fiber felts werehybridized and hybrid composites were prepared. The radar absorbing material (RAM)reflectivity were measured using reflectivity arch measurement and the mechanicswere discussed. For carbon fibers/epoxy resins composites, the reflection loss was influencedsignificantly by carbon fiber's distance and content. The reflection loss of vertical-arranged composites was better than that of parellel- and orthogonal-arranged ones. Ithad a better reflection property in Ku band than that in X band. A maximum reflectionloss of –20dB and over 8 GHz bandwidth were obtained from the composites inwhich fiber distance was 4 mm and the fiber content was 1k per beam. For carbon fiber felts/epoxy resins composites, the reflection loss of perceptual-arranged the dimension of mesh and the width of carbon felts bar influencedcomposites significantly. The dimension of carbon felts piece and the distancebetween two pieces of carbon felts influenced the reflection loss of capacitive-arranged composites significantly. The composite had a maximum reflection lossbelow –30dB from 9 to 11 GHz. With integrations of merits of vertical-arranged carbon fibers and perceptual-arranged carbon fiber felts, different partitions of the composite were composed ofperceptual-arranged carbon fiber felts bars(width=5mm,diatance=10mm) and vertical-arranged carbon fibers(distance=8mm ,1k per beam ) and the reflection loss band-width was 8 GHz from 10 to 18 GHz below -20dB. A maximum reflection loss of–30dB and over 10GHz bandwidth from 8 to 18 GHz were obtained from thecomposite with Interpenetration of perceptual-arranged carbon fiber felts bars (width=5mm, diatance=20mm) and vertical- arranged carbon fibers(distance=4mm ,1k perbeam ).