Abstract
Nonwovens containing pitch-based carbon fiber (PCF), polyester fiber, or wool fiber with thermo-bonding fiber 4080 as the bonding agent are fabricated by the through-air thermal bonding process. The volume fraction of carbon fiber in the nonwovens ranges from 0 to 1.5%. Radar wave absorbing properties of the nonwovens are investigated by the far-field RCS measurement in the frequency range from 8 to 18 GHz. Results of the measurement indicate that the radar-absorbing capacity of the nonwovens is closely related to the volume fraction of carbon fiber in the nonwovens and the thickness of the nonwovens, regardless of the types of fiber except PCF in the nonwovens. When the thickness of the nonwovens is 10 mm, radar-absorbing capacity of the nonwovens varies with the content of PCF and reaches the maximum around the PCF volume fraction of 0.036%. When the thickness of the nonwoven with the PCF volume fraction of 0.036% is 6 mm, there appears an absorption peak on the curve of reflectivity at the frequency around 11 GHz, and the absorption in the whole frequency range from 8 to 18 GHz is intensified. Electromagnetic parameters of the component fibers in the nonwovens are tested by the coaxial transmission line method andthe radar absorption characteristics of the nonwovens are explained on the basis of the electromagnetic properties of these fibers.
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