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Influence of Graphene Coating of the Elements in a Two-Dimensional Parabolic Mirror Consisting of Parallel Cylinders on Radio Wave Focusing
Radiophysics and Quantum Electronics ( IF 0.8 ) Pub Date : 2021-02-16 , DOI: 10.1007/s11141-021-10051-5
E. A. Velichko , A. P. Nickolaenko

We model the diffraction of a plane TE-polarized electromagnetic wave by a parabolic structure consisting of N parallel circular cylinders, where N ∼ 50. The problem of diffraction of a plane wave by a cylinder with arbitrary coordinates of its center is solved. The coupling of individual structural elements is not allowed for in the performed calculations. The field behavior in the vicinity of the focus of the considered parabolic antenna is studied for cylinders made of a dielectric, a dielectric with a graphene monolayer, and perfectly conducting cylinders. It is found that a layer of graphene can lead to an almost twofold increase in the maximum amplitude of the field in the focus, which makes the focusing properties of the dielectric antenna rather close to those of an antenna consisting of perfectly conducting cylinders. It is shown that the field amplitude in the focus oscillates strongly as the frequency increases, and the focus itself moves slightly off the center of the reflector system. The size of the focal spot is studied as a function of the incident-field frequency, cylinder radii, and the distance between the individual reflectors. It is shown that the field in the vicinity of the considered structure has certain features, such as slow and fast oscillations of the field amplitude, which occur as the frequency of the incident wave varies.



中文翻译:

平行圆柱组成的二维抛物面镜中元素的石墨烯涂层对无线电波聚焦的影响

我们用一个由N个平行圆柱体组成的抛物线结构(其中N〜50)来模拟平面TE极化电磁波的衍射。解决了平面波被中心为任意坐标的圆柱体衍射的问题。在执行的计算中不允许各个结构元件的耦合。对于由电介质制成的圆柱体,具有石墨烯单层的电介质和导电性良好的圆柱体,研究了所考虑的抛物线天线焦点附近的场行为。已经发现,石墨烯层可以导致聚焦场的最大振幅几乎增加两倍,这使介电天线的聚焦特性与由导电圆柱体组成的天线的聚焦特性相当接近。结果表明,聚焦点的场幅随频率的增加而剧烈振荡,聚焦点本身略微偏离反射镜系统的中心。根据入射场频率,圆柱半径和各个反射镜之间的距离来研究焦点的大小。结果表明,所考虑结构附近的场具有某些特征,例如场振幅的慢速和快速振荡,它们随入射波频率的变化而发生。

更新日期:2021-02-16
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