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In this paper, a broadband tunable polarization converter based on graphenemetasurfaces is proposed. This polarization converter works in the terahertz(THz) frequency region, using the advantage of graphene characteristics to havea tunable frequency response. The designed graphene-shaped periodic structureon top of the substrate is utilized to convert the incident wave polarizationto the desired target in a flexible operational band in the THz frequencies.The polarization conversion ratio is more than 0.85 in a wide range offrequencies in the THz band from 4.86 to 8.42 THz (the fractional bandwidth is54%). The proposed polarization converter is insensitive to the angle of theincident wave up to 40{\deg}. Using graphene provides a tunable frequencyresponse without changing the geometry of the designed structure.

Broadband Tunable Terahertz Polarization Converter based on Graphene-shaped Metasurfaces