Hybrid Minkowski Fractal FSS Based Multiband Polarization Insensitive Radar Absorber

It is still a difficult issue for researchers to achieve optimal absorption at the same time, polarization insensitivity, in the development of microwave absorbing structures. In this paper, a unit cell influenced by hybrid fractal geometry is created in such manner that absorption at six resonance frequencies occurs in C, X, and Ku bands. The designed structure exhibits an excellent absorption incidence angle up to 90° for transverse electric (TE) and transverse magnetic (TM) mode. The simulation results show a peak absorptivity greater than 95% at 4.1 GHz, 7.1 GHz, 9.5 GHz, 11.7 GHz, 14.0 GHz and 17.5 GHz, respectively. The surface current distributions are plotted, which support the absorption phenomena at resonant frequencies.