A Physical Optics Approach to the Analysis of Metascreens
A Physical Optics Approach to the Analysis of Metascreens
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DOI：
10.1109/access.2020.3021345
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
M. Mencagli;E. Martini;S. Maci;M. Albani
中科院分区：
文献类型：
--
作者：
M. Mencagli;E. Martini;S. Maci;M. Albani
基于超表面（MTS）的人造屏幕，也称为超屏幕（MetS），正在成为一种非常流行的电磁场操纵工具。尽管人们在合成方法的开发上投入了大量的研究工作，但基于这一概念对真实结构进行精确建模的工作却很少。本文提出了一种基于物理光学 (PO) 的方法，用于有效描述由介电层分隔的 MTS 堆栈组成的元屏幕的散射场。 PO 电流的推导基于电场和磁场适当传输系数的定义，而电场和磁场传输系数又依赖于多层结构的等效传输线模型。在此模型中，MTS 通过均匀化的等效表面阻抗来表示。所提出的模型考虑了非局部传输特性以及 MetS 的有限厚度和尺寸。通过与全波模拟的比较，验证了散射场预测的准确性。
Artificial screens based on metasurfaces (MTSs), also called metascreens (MetSs) are becoming a very popular tool for electromagnetic field manipulation. While significant research efforts have been devoted to the development of synthesis methodologies, less work has been done for the accurate modeling of real structures based on this concept. This paper presents a method based on a Physical Optics (PO) for the efficient description of the scattered field of metascreens consisting of a stack of MTS separated by dielectric layers. The derivation of the PO currents is based on the definition of proper transmsission coefficients for the electric and magnetic fields which, in turn, relies on an equivalent transmission line model of the multilayer structure. In this model, the MTSs are represented through homogenized equivalent surface impedances. The proposed model takes into account the non-local transmission properties and the finite thickness and size of the MetS. The accuracy in the scattered field prediction has been verified through comparison with full-wave simulations.