Dual Band Metamaterial Absorber For S And C Band Applications

This paper describes the design of a low frequency dual band metamaterial absorber. The unit cell of the proposed absorber contains 3 hexagonal split ring resonators with four wave trappers encircled in a circular ring resonator. The modelling and simulation of the unit cell with a dimension of 32mm X 32mm are carried out in ANSYS HFSS. For enhancing the absorption capability, complete metal backing is provided for the proposed structure. On simulation, perfect absorption is achieved at 2.4 GHz (ISM band) and 5.3 GHz (satellite band) frequencies. The metamaterial element is modelled on FR4_epoxy substrate with a dielectric constant of 4.4 and loss tangent of 0.02. The metamaterial properties of the proposed structure are investigated using S- parameter retrieval method and found to have perfect double negative behavior at 2.4GHz.