Effect of particle size on radar wave absorption of fractal frequency selective surface loaded multilayered structures

A thin broadband multilayer absorber loaded with fractal frequency selective surface (FSS) by employing micron (80-90 μm) and nano (20-30 nm) sized Ti based Fe₃O₄ nanoparticles have been presented. The experimentally measured complex permittivity and permeability values have been used for implementation of a two layer absorber in the range of 8.2 to 12.4 GHz. A double layer absorber loaded with Sierpinski gasket geometry based fractal FSS, designed with the help of Ansoft HFSS, has been found to possess a peak reflection loss (RL) value of -33.83 dB at 8.2 GHz for 1.6 mm thickness and bandwidth of 2.5 GHz corresponds to RL <; - 10 dB.