ECCOSORB^® AN is a series of lightweight, Refers to the medium of air (or vacuum) in which radio waves may travel. This is in contrast to waves traveling on transmission lines such as coax or waveguide, or through a medium, such as an Free Space Absorber (Specular Absorber)free space, multi-layer, broadband microwave absorbers. Products are made from polyurethane foam that is treated with carbon and assembled in a laminate construction to generate a controlled An absorber in which the dielectric properties effectively vary as the radiation passes through the absorber. This is accomplished by stacking layers having different dielectric properties (ECCOSORB AN, ANW).conductivity gradient. Each product in the series has it’s own low end cut-off frequency that forms the basis of selection based on operating frequency. Reflectivity reduction is at least 20 dB down for normal incident energy with the correct choice of ECCOSORB^® AN absorber.

In situations where the absorber will come in contact with water, fuel, hydraulic fluids, or will be used outdoors, ECCOSORB^® ANW is recommended. 

Examples for use are radar antenna nacelles, anechoic enclosures, antenna or target test mounts in radar ranges, and inside or outside horn antennas.  ECCOSORB^® AN can also be used to produce desired modifications in antenna patterns such as the reduction of side-lobes and back-lobes.  ECCOSORB^® AN is equally effective against linear, elliptical, or circular The orientation of the electric field of the radiation. Radiation transmitted from a dipole antenna has its electric field parallel to the antenna. The wave travels in a direction perpendicular to the antenna. The electric field of the radiation being transferred is perpendicular to the widest dimension of the rectangle.
polarization and relatively insensitive to incidence angles out to 70 degrees.