两种新型负折射材料的设计

发布时间：2018-03-07 12:16

本文选题：负折射材料　切入点：介电常数　出处：《山西大学》2015年硕士论文　论文类型：学位论文

【摘要】：自从负折射率材料在理论上突破和实验上证实以来,这种新型材料就成为人们关注的热点。人们相继在微波频段、太赫兹频段、红外频段、甚至光频段设计和实现了负的折射率材料。负折射材料是一种人工合成材料,其介电常数与磁导率在同一频段同时为负,电磁波在其中传输时,E,H,K三者之间关系为左手螺旋关系,因此又称为左手材料。负折射材料中传播的电磁波波矢与能流方向相反,从而呈现出了许多异于常规介质的新奇特性。本文设计了两种新型的负折射材料。通过数值模拟和S参数反演法得到的结果表明,这两种结构的材料分别具有单频段和双频段的负折射特性。同时数值研究了这两种负折射材料结构单元的尺寸参数对材料的电磁参数的影响,并进行了优化设计。本论文安排如下：第一章介绍了负折射材料基本理论、新奇特性和国内外的研究现状。第二章对经典的S参数反演法和仿真软件HFSS做了简单的介绍。第三章设计一种由改造的开口谐振环和十字交叉线为结构单元的新型负折射率材料。利用仿真软件HFSS对这种新型材料结构单元进行S参数提取,并通过S参数反演法得到材料的宏观电磁参数,如介电常数、磁导率、波阻抗和折射率。结果表明该材料在21GHz到24.5GHz之间具有单频段的负折射。同时分析了基本单元结构的参数变化对负折射频段的影响,根据分析的结果,给出了该材料在优化参数下的介电常数、磁导率以及负折射率分布。第四章利用改造过的“8”字矩形金属环分别刻蚀在FR-4介质基板的两侧,设计了一种双频段负折射材料的结构单元,仿真实验发现,该结构单元可以在17.3GHZ到17.8GHz之间和20.2GHz到21.2GHz之间实现双频段的负折射,同时通过分析结构参数变化对该单元结构的电磁参数的影响,对其进行优化设计。第五章总结全文。
[Abstract]:Since the breakthrough in theory and experimental verification of negative refractive index materials, this new material has become the focus of attention. People have been in the microwave frequency band, terahertz band, infrared frequency band, Even the negative refractive index material is designed and realized in the optical frequency band. The negative refraction material is a synthetic material, whose permittivity and permeability are negative at the same frequency band. Therefore, it is also called left-handed material. The electromagnetic wave vector propagating in negative refraction material is opposite to the direction of energy current. In this paper, two new negative refraction materials are designed. The results obtained by numerical simulation and S-parameter inversion show that, The materials of these two structures have the negative refraction characteristics of single frequency band and double frequency band respectively. The influence of the size parameters of the structural elements of the two negative refraction materials on the electromagnetic parameters of the materials is numerically studied. The thesis is arranged as follows: in chapter 1, the basic theory of negative refraction material is introduced. In chapter 2, the classical S-parameter inversion method and the simulation software HFSS are briefly introduced. In Chapter 3, a new structure unit is designed, which is composed of a modified open resonant ring and a crossover line. Using the simulation software HFSS to extract the S parameters of this new material structure unit, The macroscopic electromagnetic parameters, such as permittivity and permeability, are obtained by S-parameter inversion. The results show that the material has negative refraction in a single frequency band from 21GHz to 24.5GHz. At the same time, the influence of the parameters of the basic unit structure on the negative refraction band is analyzed. The dielectric constant, permeability and negative refractive index distribution of the material under the optimized parameters are given. In Chapter 4th, the modified "8" rectangular metal ring is used to etch on both sides of the FR-4 dielectric substrate, respectively. A kind of negative refraction material structure element in double frequency band is designed. The simulation results show that the structure unit can achieve negative refraction in the range of 17.3 GHz to 17.8 GHz and 20.2GHz to 21.2GHz, respectively. At the same time, by analyzing the influence of the structural parameters on the electromagnetic parameters of the unit structure, the optimization design is carried out. Chapter 5th summarizes the full text.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

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