Application of micro-genetic algorithm (MGA) to the synthesis of broadband microwave absorbers comprising multiple frequency selective surfaces embedded in dielectric and magnetic media

We present a novel optimization procedure to synthesize broadband microwave absorbers comprised of multiple frequency selective surfaces (FSSs) embedded in dielectric and magnetic media, which may be lossy or lossless. A micro-genetic algorithm (MGA) is employed for optimal selection of the material and thickness of each layer, the FSS screen cell structure, its periodicities in the x- and y-directions, its placement within the composite and the screen material. The result is a multi-layer composite that provides maximum absorption of both TE and TM waves simultaneously for a prescribed range of frequencies and incident angles. This technique automatically places an upper bound on the total thickness of the composite.