This paper describes a graphene-based Yagi-Uda antenna with a dual-band response. The proposed antenna consists of four parasitic elements and one driven element are made up of graphene material. The driven element is excited by a 50 Ω pec microstrip feedline connected through a PEC vias. The proposed antenna operates at a lower band and upper band of 7.7 $\mathit{THz}$ and 8.3 $\mathit{THz}$ respectively. The antenna provides a dual-band response as well as high directivity of 7.89 dBi at 7.6 $\mathit{THz}$. The maximum efficiency and high front to back ratio (FBR) have been obtained as 84 $\%$ and 15.4 dB respectively. Furthermore, the resonant frequency can be tuned by varying the external bias voltage of graphene elements. The configuration of antenna is generated higher order mode such as $\mathit{T}{\mathit{M}}_{22}$, $\mathit{T}{\mathit{M}}_{24}$ and $\mathit{T}{\mathit{M}}_{26}$ for lower band and $\mathit{T}{\mathit{M}}_{42}$, $\mathit{T}{\mathit{M}}_{44}$ and $\mathit{T}{\mathit{M}}_{46}$ for the upper band of the proposed antenna. The antenna has been obtained dual-band which can be useful for different applications simultaneously in both the band. Moreover, the proposed antenna has potential application in $\mathit{THz}$ communication systems such as biomedical application: spectroscopy, endoscope, and cancer imaging, screening for weapons, explosive as well as nano communication networks, etc.

本文介绍了具有双频响应的基于石墨烯的Yagi-Uda天线。拟议中的天线由四个寄生元件组成，一个从动元件由石墨烯材料制成。通过PEC通孔连接的50Ωpec微带馈线激励被驱动元件。拟议的天线在7.7的较低频段和较高频段工作$\mathit{太赫兹}$ 和8.3 $\mathit{太赫兹}$分别。该天线在7.6时可提供双频带响应以及7.89 dBi的高方向性$\mathit{太赫兹}$。最高效率和高前后比（FBR）已达到84$％$和15.4 dB。此外，可以通过改变石墨烯元件的外部偏置电压来调谐谐振频率。天线的配置是生成高阶模式的，例如$\mathit{Ť}{\mathit{中号}}_{22}$， $\mathit{Ť}{\mathit{中号}}_{24}$ 和 $\mathit{Ť}{\mathit{中号}}_{26}$ 对于较低的乐队和 $\mathit{Ť}{\mathit{中号}}_{42}$， $\mathit{Ť}{\mathit{中号}}_{44}$ 和 $\mathit{Ť}{\mathit{中号}}_{46}$拟议天线的较高频段。天线已获得双频段，可同时在两个频段上用于不同的应用。此外，拟议中的天线具有潜在的应用前景$\mathit{太赫兹}$ 通讯系统，例如生物医学应用：光谱学，内窥镜和癌症成像，武器筛查，炸药以及纳米通讯网络等。