In this paper an antenna with dynamically controllable radiation pattern direction, in the low THz frequency band, is designed and investigated. The radiating element is composed of a rectangular patch antenna on a grounded dielectric while, radiation pattern control is made possible through applying a superstrate, inspired by metasurface structures, with gap of $25\mu m$ from the antenna surface. The radiating patch as well as the ground plane are designed with gold while the metasurface consists of graphene loops and patches which are placed on the either sides of a dielectric with the same material of the antenna substrate. Tunable radiation pattern direction is provided through activating appropriate columns of the metasurface unit cells. With applying an electrostatic bias voltage the graphene surface conductivity increases and the corresponding unit cells resemble properties of metals and impose parasitic effects on the antenna radiation pattern, which through wise selection of the metasurface unit cells the antenna radiation pattern is tilted in the desired direction. It is shown that the antenna radiation pattern can be dynamically controlled in the wide range of $\pm 35\mathit{degrees}$, symmetrically, in the H-plane.

在本文中，设计并研究了一种在低太赫兹频段具有动态可控辐射方向图方向的天线。辐射元件由接地电介质上的矩形贴片天线组成，而通过应用超表面结构启发的覆盖层可以控制辐射模式，其间隙为$25\mu 米$从天线表面。辐射贴片和接地平面均采用金设计，而超表面由石墨烯环和贴片组成，它们放置在与天线基板材料相同的电介质两侧。通过激活超表面单位单元的适当列来提供可调谐辐射方向图。通过施加静电偏置电压，石墨烯表面电导率增加，相应的晶胞类似于金属的特性，并对天线辐射图施加寄生效应，通过明智地选择超表面晶胞，天线辐射图向所需方向倾斜。结果表明，天线辐射方向图可以在很宽的范围内动态控制。$\pm 35\mathit{度数}$，对称地，在 H 平面。