 We investigate the interaction between polarized terahertz radiation and microstructured large area graphene in transmission geometry by laterally patterning a closed graphene sheet with intercalation doping into stripes, observing unequal transmittance of the radiation polarized parallel and perpendicular to the stripes, and analyzing the polarization dependence in a large frequency range from less than 80 gigahertz to 3 TGZ. This article was authored by Christian Sorge, Sasha Prue, Johanna Schmidt, and others.