Study on electromagnetic wave transmission performances of ultra-thin metallic films

Microwave absorbing performances of ultra-thin metallic films were analyzed by resonance absorbing principle and transmission line theory. The sheet resistances and reflectivity of ultra-thin aluminum and nickel films were measured when they were applied to foam with different thickness. The little difference between the calculated and experimental results was discussed. Both the influence of foam thickness upon absorption peak position and the influence of metallic films of different sheet resistance upon absorbing peak value were discussed. It is concluded that the structure of ultra-thin metallic films can result in resonance absorbing, the absorbing performances were decided by both medium materials and metallic films.