Simulation Study of Ultra Compact Polarization Independent Dual-Band Metamaterial Absorber

Abstract

In this paper, a dual-band ultra-thin compact polarization independent metamaterial absorber is proposed. The proposed absorber consists of two resonating structures i.e. a swastika-shaped and a square ring-shaped. The swastika shaped structure is enclosed within a square ring. The size and thickness of the unit cell are 6 × 6 mm ² and 0.015λ (where λ is the lowest resonating frequency), respectively. The combination of two resonating structures provides peak absorbance at 5.65GHz and 10.91GHz with maximum absorptivity 98.8% and 99.5%, respectively. The application platform of the reposed absorber lies in C and X band. The surface current distributions at 5.65GHz and 10.91GHz have been studied for a better insight of the absorption peaks. The simulation study confirms that the proposed absorber stable over wide angle under TE and TM polarization. Moreover, the proposed unit cell provides polarization insensitivity due to fourfold symmetric geometry.