Abstract: The appropriate absorbing powders were selected by taking advantage of the transmission line theory of single layer absorber in combination with computer-aided design (CAD). The flexible textile coating fabrics based on copper-nickel coating fabric (CNCF) and metallic yarn blended composite fabric (MYBF) with polyurethane as matrix were prepared, and the thickness of coatings was 1.5mm. The electromagnetic properties of absorbing powder were measured and analyzed. The effects of absorbing powder and matrix of different mixed ratio and fundamental fabrics on reflection loss and absorption mechanism were investigated and studied in frequency range of 2.6GHz-18GHz.The results showed within a certain range absorbing powder volume percent increase, absorbing performance improved, band broadened, the peak of reflection loss curve moved to lower frequency. The absorbing performance of coating fabric based on MYBF was better than that based on CNCF.

Key words: acetylene carbon black, carbonyl iron powder, substrate, coating, absorbing capacity