Design of Multilayer Radar Absorbing Material Containing the Composite of Magnetic Metal Fiber as One Layer

In this paper, we present a method for designing multilayer-radar-absorbing material. Generally, low reflectance within low frequency band is difficultly obtained by using ordinary lossy material. Magnetic metal fiber may have larger permeability at low microwave band than ordinary lossy materials have, but until now, no design has been performed for absorbing material containing magnetic fiber. We design the absorbing material by using magnetic fiber composite as a layer together with several ordinary material layers. The parameters and thicknesses of these layers are optimized by a modified genetic algorithm. The obtained results show that the reflectance at low frequency have been improved considerably.