The composite absorber is made of highly flame retardant polystyrene impregnated with carbon, with high performance, wide band characteristics. In addition, its light weight can greatly reduce the weight of items. The absorber gives full play to the characteristics of various loss materials, and has excellent radio wave absorption performance from the low frequency 30MHz. Meet all kinds of 1m, 3m, 5m, 10m method full/half wave anechoic chamber EMC test site.