Research on absorpting properties of double-layer absorpting materials

According to resistance matching principle and electromagenetic spreading regulation, double-layer absorpting materials with resistance gradual changing structure were designed.The experiments show that,matching layer plays an importmant role in absorption ratio;its EM parameters and thickness should be controlled precisely to realize good absorption ;and the bigger of its EM parameters,the thinner of matching thickness.Electronic medium materials are light and magenetic medium materials are big in loss.Double-layer absorption materials composed of them own low area density ,electronic loss and magenetic loss.It is measured that reflectivity is less than -10dB in 8～18GHz for 1~#,2~#,and less than -8dB for 3~#～6~#.So them can be used practically.