基于逆变换光学的天线设计研究

发布时间：2018-03-28 11:27

本文选题：变换光学　切入点：逆变换光学　出处：《北京交通大学》2017年硕士论文

【摘要】：变换光学的提出为人工电磁材料与电磁波的自由调控之间架起了一座桥梁。变换光学通过坐标变换,对变换媒质的材料参数进行设计,从而使得通过变换媒质的电磁波可以按照人们设想的方式进行传播。借助其可以自由调控电磁波的显著优点,变换光学与天线设计的交叉研究也逐渐成为了热点。本文从变换光学的基本概念出发,结合其相关的延伸理论,并以人工电磁材料作为最终的实现手段,对变换光学在天线设计领域中的应用进行了相关的理论分析与仿真验证,具有一定的理论意义与应用前景。本文的主要研究内容与创新点如下:1.研究了变换光学理论条件下阻抗边界条件的处理方法与应用。理论推导出了共形变换下阻抗边界条件在变换前后应遵循的变换形式,并通过仿真进行了验证。2.以天线应用为背景,提出了逆变换光学的设计思路,实现了传播波到表面波的转化表面以及多波束生成表面的设计。针对传播波到表面波转化表面的设计进行了深入和细致的研究,分析了坐标变换方式以及厚度的不同对其辐射特性的影响。3.基于逆变换光学理论,设计出了一种新型的多波束双极化转换表面,并对结构参数进行了合理的近似和有效的简化,最终通过紧凑的多层人工电磁表面结构予以实现。本文研究表明,以变换光学为理论指导,以人工电磁材料为物质基础的创新研究将为天线辐射特性的灵活且有效调控带来新的思路和途径,相关交叉学科研究领域蕴藏着巨大的科研潜力。
[Abstract]:A bridge between artificial electromagnetic material and the free control of electromagnetic wave is put up in the paper. The material parameters of the transformed medium are designed by the transformation optics through coordinate transformation. So that the electromagnetic waves through the transformed medium can be propagated in the way that people imagine, and with the help of their remarkable advantages of being able to freely control the electromagnetic waves, The cross study of transform optics and antenna design has gradually become a hot topic. This paper starts from the basic concept of transform optics, combines its related extension theory, and takes artificial electromagnetic material as the final means of realization. The application of transform optics in antenna design is analyzed and simulated. The main contents and innovations of this paper are as follows: 1. The method and application of impedance boundary condition under the theory of transformational optics are studied. The co-deformed commutative resistance is derived theoretically. The transformation form that the anti-boundary condition should follow before and after the transformation, Based on the application of antenna, the design idea of inverse transform optics is put forward. The conversion surface from propagating wave to surface wave and the design of multi-beam generating surface are realized. The design of the transformed surface from propagating wave to surface wave is studied deeply and meticulously. The influence of coordinate transformation mode and thickness on the radiation characteristics is analyzed. Based on the inverse transform optical theory, a new multi-beam dual-polarization conversion surface is designed, and the structural parameters are reasonably approximated and effectively simplified. Finally, it is realized by compact multilayer artificial electromagnetic surface structure. The innovative research based on artificial electromagnetic materials will bring new ideas and approaches to the flexible and effective regulation of antenna radiation characteristics.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN820

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