polarization controlling of multi resonant graphene-based microstrip antenna

In this paper, a graphene-based patch antenna is proposed. the antenna structure is designed so that each of the various antenna sections affected by chemical potential changes can provide a certain radiation behavior for the antenna far-field. the main purpose of the design is to control the polarization of the antenna only by changing its graphene layer fermi energy level, so that its physical structure remains fixed. in this way, it is possible to achieve a wideband antenna with a favorable matching in the frequency range of 0.82 to 1.07 thz. it is possible to control its polarization in three states: the right- and left-hand circular polarization with an axial ratio less than 3 db for a frequency range of 0.975 to 1.025 thz, and linear polarization in frequency range of 0.82 to 1.07 thz. the important point is that the physical structure of the antenna by adding circular layered patches at its edges provided us with the possibility of achieving a circular polarization, and with the creation of multi resonance behavior in the input impedance, provided the possibility of increasing bandwidth, significantly.