人工电磁材料近零折射率特性的研究

发布时间：2018-05-12 01:09

本文选题：人工电磁材料 + 零折射率　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：人工电磁材料是近些年物理学、材料学和电磁学的重要研究热点之一。该材料具有一些常规材料所不具有的特性，这些新颖特性能够应用在许多重要领域，突破传统瓶颈。本文所研究的零折射率材料作为人工电磁材料的一种，具有零折射率、近零相移等特点，近零折射率材料能够应用在很多新型微波器件和天线中。论文的主要研究内容包括：首先介绍了人工电磁材料的实现手段和实现理论，对具有负介电常数和负磁导率的人工电磁材料及具有零折射率的材料的特性进行了系统分析，对其所具有的特性及能够应用的领域做了阐述。重点分析了实现机理不同的几种零折射率材料单元，其中有磁谐振单元开口谐振环（SRR）、电谐振单元弯折金属线、电场耦合谐振单元（ELC）以及基于开口谐振环的互补开口谐振环（CSRR）。然后对零折射率材料在提高天线增益和定向性方面进行了研究，阐述了零折射率覆层的波束汇聚原理，分析了覆层面积、覆层层数和覆层与天线间距离对天线性能的影响，并利用金属过孔和弯折线组合有效的降低了零折射率材料的响应频率，对人工电磁材料的均匀性进行了改善，，提出了一种应用于圆极化天线的零折射率覆层。对F-P谐振理论进行研究，分析了F-P谐振理论对确定覆层天线谐振腔高度的有效性，并以F-P理论为指导，设计了一种具有负反射相位和一定反射幅度的零折射率覆层。
[Abstract]:Artificial electromagnetic materials are one of the important research hotspots in physics, materials and electromagnetics in recent years. This material has some characteristics which are not possessed by conventional materials. These novel properties can be applied in many important fields and break through the traditional bottleneck. As a kind of artificial electromagnetic material, the zero refractive index material studied in this paper has the characteristics of zero refractive index and near zero phase shift. The near-zero refractive index material can be used in many new microwave devices and antennas. The main contents of this thesis are as follows: Firstly, the realization method and realization theory of artificial electromagnetic material are introduced, and the characteristics of artificial electromagnetic material with negative dielectric constant and negative permeability and material with zero refractive index are systematically analyzed. The characteristics and application fields are described. Several kinds of zero refractive index material elements with different mechanisms are analyzed, including magnetic resonance unit open resonant ring (SRR), electric resonance element bending metal wire, electric field coupled resonance unit (ELC) and complementary open resonant ring based on open resonance ring (CSRR). Then the zero-refractive index material in improving antenna gain and directionality is studied. The principle of beam convergence of zero-refractive index coating is described. The effects of the area of the coating, the number of layers and the distance between the coating and antenna on the antenna performance are analyzed. The response frequency of zero refractive index material is effectively reduced by the combination of metal through hole and bending line, and the homogeneity of artificial electromagnetic material is improved. A kind of zero refractive index coating applied to circular polarization antenna is proposed. The F-P resonance theory is studied, and the effectiveness of F-P resonance theory in determining the height of cladding antenna resonator is analyzed. A zero-refractive index coating with negative reflection phase and certain reflection amplitude is designed under the guidance of F-P theory.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：O441.6;TN820

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