Microwave absorption of CB/ABS continuous conductivity medium

Carbon black(CB)/Acrylonitrile Butadiene Styrene(ABS) continuous medium absorber was prepared by means of hot pressing.The effects of carbon black fraction and sample thickness on CB/ABS composites' microwave absorption and dielectric performance were studied.The analysis results indicated that the dielectric constant and loss tangent of CB/ABS composites increased with increasing of CB content,when CB mass fraction got to 20wt%,which corresponded to volume resistivity 105Ω·cm of CB/ABS composites,absorption peak of the CB/ABS slab were improved greatly and arrived at optimally values.Thick samples were helpful to the loss of microwave to a certain extent.Microwave absorption of CB/ABS continuous conducting medium was calculated according to formula of modified Rayleigh effective-medium theory and general reflection loss and it is found that calculated values were close to experimental values,which could tell us that this calculating method was applied and could be used as valuable reference of absorbing slab design.