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Research and Application of Metamaterial Transmission Mechanism

Author: JiGang
Tutor: LiuXueGuan
School: Suzhou University
Course: Communication and Information System
Keywords: Metamaterial electromagnetic grating band-gap wedge waveguide
CLC: O441.6
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
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Abstract


Metamaterial is a kind of material which has special electromagnetic characteristics, its structure can be changed in artificial way. The typical Metamaterial includes Left-handed materials, electromagnetically induced transparency materials, photonic crystals and so on. In this paper, the electromagnetic grating will be studied. Periodically arrayed metal strips constitute the metal electromagnetic grating which is a vital realization form of Metamaterial. Electromagnetic grating with different structures have different electromagnetic transmission properties, specially the transmission abilities and band-gap characteristics. Therefore, it has considerable significance to study the transmission mechanism for the application of Metamaterial.Firstly, we made a theoretical model of electromagnetic grating,analyzed the factors that influence electromagnetic grating transmission characteristics theoretically. Then, the transmission properties of two typical electromagnetic grating were studied. Parameters which influence the structure character were analyzed with time-domain analysis methods, and a transmission changing regularity was concluded as a result. In the analysis, study objects are selected as the one-dimensional electromagnetic grating in the form of cuboid and cylinder unit and the two-dimensional electromagnetic grating on the basis of cuboid structure. The variation of electromagnetic wave’s electric field caused by transmission through structures was analyzed in detail using OptiFDTD simulation software. The simulation result of each structure parameter was provided. With the analysis, a regularity of the electric field variation caused by transmission and grating coupling was given, offering a theoretical reference for electromagnetic grating design.After that, transmission properties of wedge-shape waveguide structures with two different boundaries were analyzed, Through the research on wedge-shape waveguide with boundaries of cooper, And also, the relationship between transmission property and structure parameters was provided, put forward a proposal that extract electromagnetic wave with certain frequency with wedge-shape waveguide. Firstly, with the band-gap characteristic of photonic crystals, the problem of electromagnetic wave transmission loss was solved. And also, the fact that electromagnetic waves with different frequencies have different transmission depth in the wedge-shape waveguide was proved theoretically. And then, a wedge-shape waveguide with photonic crystals as its border was constructed, The simulation results show that, the structure has great prospect in the extraction of electromagnetic wave with certain frequency.At last, the paper was concluded and the related research work of late is prospected.

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CLC: > Mathematical sciences and chemical > Physics > Electromagnetics,electrodynamics > Electricity and Magnetism > Electromagnetic properties of substances
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