Preparation of wave-absorbing coated composite fabric and its microwave absorption capacity

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). A flexible coated composite fabric with a layer depth of 1. 5 mm was manufactured with copper-nickel coating fabric( CNCF) and metallic yarn blended composite fabric( MYBF) as substrates,respectively and polyurethane as matrix. The electromagnetic properties of absorbing powders were measured and the effects of absorbing powders with different mixed ratios of the matrix on the reflection loss and absorption mechanism of the coated composite fabric were investigated in frequency range of 2. 6-18. 0 GHz. The results showed that within a certain range,with the increase of absorbing powder volume percent, absorbing performance improved,band broadened,and the peak of reflection loss curve moved to the lower frequency. The absorbing performance of the coating fabric based on MYBF was better than that based on CNCF.