Wideband Ultra-Thin Polarization Insensitive Flower shaped Absorber

A compact ultrathin wideband, wide incidence angle, nearly perfect metamaterial absorber has been proposed in this paper. The unit cell consists of a simple flower shaped resonator with a circular patch and four chip resistors. Under normal incidence, it has absorptivity greater than 90% from 5.55 GHz to 15.39 GHz. While, when the incidence angle is oblique it can achieve absorptivity greater than 80% up to 45 degrees for both TE and TM mode waves. The unit cell electrical area and thickness are 0.22 lambda(L) x 0.22 lambda(L) and 0.11 lambda(L) where, lambda(L) is the lowest absorption frequency wavelength. Input impedance and field distribution have been discussed to analyze the absorption mechanism.