▎ 摘　　要

In this paper, a dual band graphene square patch antenna is designed for operation in 4 THz and 7.75 THz. The main idea of this paper is partitioning the graphene patch into pieces to have more degrees of freedom to reconfigure the polarization of antenna. Antennas polarization is controlled by partitioning the patch into 9 elements, resizing them and changing their chemical potential. The main operation mode of antenna has linear polarization in its boresight. Circular polarization is reached in five different modes; each mode has its own advantages. The main purpose is to achieve minimum efficiency loss modes among all chemical potential combination modes. Each mode has two separate types, one type will have RHCP and the other one will have LHCP, switching types will change RHCP to LHCP or LHCP to RHCP.