Structural composite material absorbing radar waves and use of such a material

摘要

The invention relates to structural composite material able to absorb radar waves at frequencies of 18 GHz, 35 GHz and 94 GHz. This material comprises at least three layers of non-magnetic, dielectric material obtained by stacks of impregnated plies, including an outer layer with a low reflection index and losses having an effective dielectric permittivity of around 3, to promote the penetration of the incident radar waves, an intermediate layer having an effective dielectric permittivity of around 5, and an inner layer loaded with electrically conductive particles and having a substantial effective dielectric permittivity of around 15 to 20. The material may have applications in the manufacture of chests for military vehicles, for example.