Multilayer Absorber Based on Carbon Fibers Loaded Epoxy Foam

Abstract

Due to the rapid development of electronics and telecommunications, protection against electromagnetic waves has become an active area of research, and the intensification of protective materials usage is reflecting the market needs and the great demand of such products. The form and composition of electromagnetic absorbers are various and depend on the application under consideration. The typical absorbing materials used in the anechoic chambers are made of Polyurethane (PU) foam loaded with carbon particles. These absorbers have either flat or pyramidal forms [1]; our targeted form is the flat multilayer absorber. The foam structure of these absorbers gives them a low density but also a high flexibility which induces machining errors. On the other hand, the carbon particles load ensures an absorption in large frequency band but this load is volatile as well so that it can easily escapes from the absorber and threatens human health. Our proposed material [2] is made of epoxy foam (rigid foam) loaded with carbon fibers (nonvolatile load).