Planar negative refractive index media using periodically L-C loaded transmission lines
Planar negative refractive index media using periodically L-C loaded transmission lines
复制标题
DOI：
10.1109/tmtt.2002.805197
复制
发表时间：
2002-12-01
影响因子：
4.3
通讯作者：
Kremer, PC
中科院分区：
文献类型：
--
作者：
Eleftheriades, GV;Iyer, AK;Kremer, PC
最近的演示负折射利用三维集合的离散周期性散射体合成人工介电常数和磁导率同时为负。在本文中，我们提出了一个替代的角度来看，利用著名的L-C分布式网络表示的同质化的材料的设计和功能。在传统的低通拓扑中，量L和C分别表示正的等效磁导率和等效介电常数。然而，在双重配置中，其中L和C的位置简单地互换，这些等效材料参数同时假定为负值。这些双网络的二维周期性版本用于演示负折射和聚焦;这些现象是这样的介质支持传播基波后向谐波的事实的表现。因此，我们提出了这些人工传输线介质的特点，并提出了一个合适的手段，实现它们在平面形式。然后，我们提出了电路和全波场模拟说明负折射和聚焦，并使用这样的实现聚焦的第一个实验验证。
Recent demonstrations of negative refraction utilize three-dimensional collections of discrete periodic scatterers to synthesize artificial dielectrics with simultaneously negative permittivity and permeability. In this paper, we propose an alternate perspective on the design and function of such materials that exploits the well-known L-C distributed network representation of homogeneous dielectrics. In the conventional low-pass topology, the quantities L and C represent a positive equivalent permeability and permittivity, respectively. However, in the dual configuration, in which the positions of L and C are simply interchanged, these equivalent material parameters assume simultaneously negative values. Two-dimensional periodic versions of these dual networks are used to demonstrate negative refraction and focusing; phenomena that are manifestations of the fact that such media support a propagating fundamental backward harmonic. We hereby present the characteristics of these artificial transmission-line media and propose a suitable means of implementing them in planar form. We then present circuit and full-wave field simulations illustrating negative refraction and focusing, and the first experimental verification of focusing using such an implementation.