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Dynamic beam-steering of graphene-based terahertz cross Yagi–Uda antenna with a theoretical approach
Journal of Optics ( IF 2.1 ) Pub Date : 2020-12-23 , DOI: 10.1088/2040-8986/abcf83
Seyyed Mohammad Mehdi Moshiri , Najmeh Nozhat , Maryam Khodadadi

In this paper, for the first time, a dynamic tunable graphene-based cross Yagi–Uda antenna in the terahertz region has been investigated comprehensively by two numerical methods and analytical analysis. To verify the accuracy of the analytical solution based on the coupled dipole method to obtain the directivity pattern, two numerical methods of finite-element and finite-difference time-domain have been used. Numerical results are well matched with the theoretical ones. By introducing the tunable cross Yagi–Uda antenna with graphene-coated spheres, different directivity radiation patterns such as omni-, vertical and horizontal bi- and quad-directional have been obtained with the maximum directivities of 2.42, 12.4, 12.3, and 10.5 dBi, respectively. Moreover, the effect of different element shapes including cube and cylinder on the directivity and radiation efficiency has been studied. Also, the new idea of multiple-access and controlling the user’s access to the radiated optical electromagnetic waves from the transmitting antenna has been studied as an optical wireless on-chip link. Finally, the effect of structural parameters on the directivity of the proposed antenna has been surveyed with the tolerance of 5% to investigate the imperfections that may appear in the fabrication process.



中文翻译:

基于石墨烯的太赫兹交叉八木-宇田天线的动态波束转向

本文首次通过两种数值方法和分析方法,对太赫兹地区基于动态可调谐石墨烯的八木-Uda交叉交叉天线进行了全面研究。为了验证基于偶极子耦合方法求解解析度的准确性,采用了时域有限元和时域有限差分两种数值方法。数值结果与理论值吻合良好。通过引入带有石墨烯涂层球体的可调谐八木十字天线,可获得不同的方向性辐射图,例如全向,垂直和水平双向和四向,最大方向性分别为2.42、12.4、12.3和10.5 dBi。 , 分别。而且,研究了包括立方体和圆柱体在内的不同元素形状对方向性和辐射效率的影响。另外,作为光学无线片上链路,已经研究了多路访问并控制用户对来自发射天线的辐射光电磁波的访问的新思想。最后,已经调查了结构参数对拟议天线方向性的影响,公差为5%,以调查制造过程中可能出现的缺陷。

更新日期:2020-12-23
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