Guided modes in a waveguide filled with a pair of single-negative (SNG), double-negative (DNG), and/or double-positive (DPS) layers
Guided modes in a waveguide filled with a pair of single-negative (SNG), double-negative (DNG), and/or double-positive (DPS) layers
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DOI：
10.1109/tmtt.2003.821274
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发表时间：
2004-01
影响因子：
4.3
通讯作者：
A. Alù;Nader Engheta
中科院分区：
文献类型：
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作者：
A. Alù;Nader Engheta
本文给出了由下列任意两种材料构成的平行平板波导中导模的理论分析结果：（1）具有负真实的介电常数和正真实的磁导率的材料（ε-负）;（2）具有负的真实的磁导率，但具有正的真实的介电常数的材料（μ-负）;（3）具有负的真实的介电常数和磁导率（双负）的材料;和（4）在给定频率范围内具有正的真实的介电常数和磁导率（双正）的常规材料。这些导模的显着性能进行了研究，在如何选择这些材料和它们的参数进行配对，然后进行比较和对比与传统波导中的导模。特别的功能，如单模厚波导和TE模式的存在与薄平行板波导中的无截止厚度突出和讨论。物理的见解和直观的理由的数学研究结果也提出。
Here we present the results of our theoretical analysis for guided modes in parallel-plate waveguides filled with pairs of parallel layers made of any two of the following materials: (1) a material with negative real permittivity, but positive real permeability (epsilon-negative); (2) a material with negative real permeability, but positive real permittivity (mu-negative); (3) a material with both negative real permittivity and permeability (double-negative); and (4) a conventional material with both positive real permittivity and permeability (double-positive) in a given range of frequency. Salient properties of these guided modes are studied in terms of how these materials and their parameters are chosen to be paired, and are then compared and contrasted with those of the guided modes in conventional waveguides. Special features such as monomodality in thick waveguides and presence of TE modes with no-cutoff thickness in thin parallel-plate waveguides are highlighted and discussed. Physical insights and intuitive justifications for the mathematical findings are also presented.