In this paper, a broadband tunable polarization converter based on Graphene Metasurfaces is proposed. This polarization converter works in the Terahertz frequency region, using the advantage of Graphene characteristics. It has a tunable polarization conversion ratio. Designed Graphene-shaped periodic structure on top of the substrate is utilized to convert the incident wave polarization to the desired target in a flexible operational band in the terahertz frequencies. The polarization conversion ratio is more than 0.9 in a wide range of frequencies in the Terahertz band from 5.43 to 7.66 THz (the fractional bandwidth is 34%). The proposed polarization converter is insensitive to the angle of the incident wave up to 40°. Using Graphene provides a tunable frequency response without changing the geometry of the designed structure.

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