▎ 摘　　要

In this paper, a circular patch antenna with cross-shaped slot is designed. Graphene has been used in the design of the said antenna. The proposed antenna structure has frequency reconfigurable capability. The central frequency of the antenna is considered to be 1.6 THz as required by the design. The cross-shaped slot reconfigurable graphene-based microstrip patch antenna is realized on a SiO2 substrate. In the center of the designed circular patch antenna, a slot is placed in the form of two orthogonal physical arms, or in other words, a cross shape. And as a result, the distribution of the final current of the antenna will have an orthogonal domain in the farfield. Which will have a phase difference of 90 degrees. And this is the realization of circular polarization. In the range of 0.5 THz to 2 THz, cross-shaped slot reconfigurable graphene-based microstrip patch antenna has favorable conditions in terms of matching and polarization. Also, S-11 is less than - 15 dB for the target range. The axial ratio is obtained less than 2 dB. Obtaining an axial ratio below 3 dB is ideal for providing circular polarization. Radiation efficiency is about 59%. Finally, the results of radiation efficiency, 2D and 3D radiation patterns, E-field distribution, H-field distribution and surface current distribution have been considered.