Experiments on evanescent-wave amplification and transmission using metamaterial structures
Experiments on evanescent-wave amplification and transmission using metamaterial structures
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DOI：
10.1103/physrevb.73.245119
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发表时间：
2006-06
影响因子：
3.7
通讯作者：
T. Cui;X. Lin;Q. Cheng;H. Ma;X. Yang
中科院分区：
文献类型：
--
作者：
T. Cui;X. Lin;Q. Cheng;H. Ma;X. Yang
本文对波导结构的倏逝波放大和倏逝波传输进行了理论和实验研究。在平面基片集成波导（SIW）中可以很容易地产生倏逝波（或截止波），其行为与传统的矩形波导非常相似。我们插入一个结构化的左手材料（LHM），这是由分布的串联电容和并联电感到SIW验证EWA和EWT现象。从透射系数的模拟和实验结果，我们观察到，倏逝波被放大，并通过具有负折射的频带内的结构LHM超材料传输。我们还表明，倏逝波不能传输，如果我们插入一个右手微带线或分布电容电路内的基片集成波导。这些实验直接证实了LHM超材料中的EWA和EWT现象。我们注意到，理想均匀左手材料的理论预测与结构化超材料的实验观察之间存在内部电场分布差异。我们给出了这种差异的解释。
We present a theoretical and experimental study on the evanescent-wave amplification (EWA) and evanescent-wave transmission (EWT) using a waveguide structure. The evanescent waves (or cutoff waves) can be easily generated in a planar substrate integrated waveguide (SIW), which behaves quite similarly to a conventional rectangular waveguide. We insert a structured left-handed material (LHM) that is composed of distributed series capacitors and shunt inductors into a SIW to verify the EWA and EWT phenomena. From both simulation and experimental results on transmission coefficients, we observe that evanescent waves are amplified and transmitted through the structured LHM metamaterial within the frequency band that exhibits negative refraction. We also show that evanescent waves cannot be transmitted if we insert a right-handed microstrip line or distributed capacitor circuit inside the SIW. Such experiments directly confirm the EWA and EWT phenomena in the LHM metamaterial. We notice that there is a discrepancy in internal electric field distributions between theoretical predictions in the ideally homogeneous LHM and experimental observations in the structured metamaterial. We give an explanation for this discrepancy.