论文标题
通过薄板进行元图建模
Metasurface Modeling by a Thin Slab
论文作者
论文摘要
我们研究了模拟跨表面的可能性，该元表面被定义为表面偏振电流的零厚度表，其特征在于亚波长度厚度和常规的宽敞培养基参数。首先，我们在平均电磁场方面详细阐述了跨面和平板之间的一般对等关系。然后，我们得出了元图和平板敏感性之间的确切关系，并通过全波模拟进行验证。最后，我们讨论了简单而有见地的平均场近似（AFA）公式，说明了其不适用于强大的跨表面磁场变换，并建立了其有效性范围。所有这些发展都仅限于正常平面波发生下最简单的各向同性跨表面的最简单情况。我们从这种情况的等价性的复杂性中得出结论，通常最好根据广义纸过渡条件（GSTC）对元表面进行建模。
We investigate the possibility to model a metasurface, defined as a zero-thickness sheet of surface polarization currents, by a thin slab, characterized by a subwavelength thickness and usual voluminal medium parameters. First, we elaborate a general equivalence relation between the metasurface and the slab in terms of average electromagnetic fields. Then, we derive exact relations between the metasurface and slab susceptibilities and validate them by full-wave simulations. Finally, we discuss the simple and insightful Average Field Approximation (AFA) formula, illustrate its inappropriate for strong metasurface field transformations, and establish its range of validity. All of these developments are restricted to the simplest case of a uniform isotropic metasurface under normal plane wave incidence. We conclude from the complexity of the equivalence for this case, that a metasurface is generally best modeled in terms of Generalized Sheet Transition Conditions (GSTCs).
