Novel planar absorber designs using genetic algorithms

Electromagnetic absorbers are often used to reduce radar echo from anechoic chambers, aircraft and so on. For many applications, the absorber must be built conformable to a complex surface, or must have a flat interface with the air. A new class of planar electromagnetic absorbers is proposed. This absorber is created by drilling textures within or on top of lossy material coatings. Genetic algorithms are applied to optimize the absorbers and thus achieve low reflectance over a wide frequency band. Numerical results demonstrate that the new absorber outperforms multilayer coatings and the absorber using FSS-screens. These new absorbers have been designed for various requirements.