Metamaterial-based perfect absorbers are used in many applications like photo-detectors, sensors, special light modulators, wireless communications and photovoltaic. The mechanism of absorption is based on the complete suppression of reflection and transmission of incident wave. Here we present a multi resonances perfect absorber made of Graphene micro-ribbons that each ribbons have different values of chemical potential witch brought us tunability, which by changing the value of chemical potential for each ribbon we can change the frequency of resonances independently and we can achieve to a tunable bandwidth. In the following the results for reflection and absorption from simulation are presented. Finally an equivalent circuit model is proposed for our structure and shown to very accurately predict the element absorption.
