新型人工磁导体结构特性研究及其在高性能天线中的应用

发布时间：2018-05-04 23:15

本文选题：人工磁导体(AMC) + 叠层波导(LWG)　；参考：《南京理工大学》2016年博士论文

【摘要】：人工磁导体(Artificial magnetic conductor,AMC)结构作为一种超材料,具有在特定频率范围内对平面波呈同相位反射的电磁特性,应用于天线设计中,可突破传统天线的结构极限,给无线通信系统中天线的发展带来了新的设计思路。随着无线通信技术的发展,为了满足高性能、智能化的毫米波系统与移动通信系统的发展需求,对天线的性能要求也越来越高,高效率、多功能成为现代微波毫米波天线的发展趋势。因此,探索新型人工磁导体AMC结构,开展AMC结构在提高天线效率和实现多功能特性等方面的应用研究,具有很高的学术价值与应用价值。本论文从现代无线通信系统对天线的性能需求出发,针对现有人工磁导体结构的基本特性及其在天线应用研究中存在的局限性,我们开展了深入的研究工作。本论文的创新性工作主要以论文的发表和专利的申请来体现,主体内容可以概括如下:1.基于AMC结构的LTCC毫米波天线阵列的高效率、集成化设计:结合LTCC多层工艺,提出基于AMC结构的宽带、高增益的毫米波微带天线;针对不同传输线在LTCC中的损耗特性,提出低损耗的双层一分四LWG功分网络,并与其他网络方案进行了性能比较和可行性分析;提出紧凑型LWG与矩形波导的过渡结构的改进设计,并采用背靠背测试件验证其传输性能;将上述工作相结合,研制出高效率的Ka波段4×4集成天线阵列,提出两个用于改善天线阵列性能的工程改进技术。通过实物测试,证实了提出的集成天线阵列具有稳定良好的辐射性能。该工作为基于LTCC技术的毫米波系统设计提供了较大的参考价值。这部分研究成果已在IEEE Transactions on Antennas and Propagation 期刊和2013 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference(CSQRWC),2013 IEEE International Workshop on Electromagnetics(iWEM)等会议上发表。2.新型支节加载AMC结构和非周期排布AMC结构的特性分析及在高性能天线中的应用:提出了新型的支节加载的AMC结构,给出了等效电路分析;将其应用于微带天线中,分析了其支节的非周期排布对天线性能的影响,通过合理优化加载支节的非周期排布,改善了 AMC结构表面电流和天线辐射口径场的分布一致性,使天线的带宽和增益得到了明显的提高;在此基础上,将支节加载型AMC结构等效为长方形AMC结构,结合寄生贴片思想,同时打破AMC结构的尺寸周期性和排布周期性,提出三个高性能微带天线的设计方案,并通过实验验证其高效率和宽带高效率的辐射特性。这部分工作为实现高性能天线设计提供了更大的发展空间。这部分研究成果已在IEEE Antennas and Wireless Propagation Letters 期刊和 2015 Asia-Pacific Microwave Conference上发表,其中以基于支节加载AMC结构的高增益微带天线申请了一项发明专利。3.新型的具有极化扭转功能的AMC结构及其特性分析:首次提出新型的具有极化扭转功能的人工磁导体,分析其实现极化扭转的机理,提出较为准确的等效电路;基于二维的Floquet谐波分析理论研究其表面反射场的分布,推导出二维反射系数与表面阻抗矩阵的关系;根据二维反射系数的幅度和相位分布,进一步分析了极化扭转特性及其影响因素,设计了具有较宽极化扭转频带且带内综合场为圆极化波的AMC结构;此外,还对该结构进行了结构演变和性能比较,总结出极化扭转AMC结构的设计思路。这部分工作为AMC结构的理论分析与设计提供了很好的理论指导。这部分研究成果已在IEEE Transactions on Antennas and Propagation,IET Electronics Letters 期刊和 2014年European Microwave Conference上发表,并获得IEEE天线与电波传播/微波理论与技术香港分会主办、香港中文大学承办的第15届研究生学生竞赛---天线与电波传播组最佳论文奖第一名;还以基于人工磁导体的低剖面极化扭转反射板申请了一项发明专利。4.极化扭转AMC结构在新型的低剖面、宽波束的圆极化天线和极化可重构天线上的应用:将提出的极化扭转AMC结构应用到偶极子天线中,利用其特殊的极化扭转特性,提出两种新型的低剖面、宽带、宽波束的圆极化偶极子天线,并对其进行性能比较,发现基于双金属柱极化扭转AMC结构的天线可实现对称性更好、低仰角特性更好的宽波束圆极化辐射特性;在此基础上,将极化扭转AMC结构与交叉偶极子天线相结合,提出可实现右旋圆极化、左旋圆极化和+45°线极化三种极化状态的多极化天线;结合开关控制的可重构网络,实现了三种极化快速切换的新型极化可重构天线。这部分工作为实现结构新颖和原理简单的可重构天线提供了很好的设计方案,为现代无线通信系统的多功能性能需求提供了技术参考。这部分工作与前面工作结合,已在IEEE Transactions on Antennas and Propagation 期刊和2015年Asia-Pacific Conference on Antennas and Propagation 上发表;还有 1 篇已录用于 IEEE Transactions on Antennas and Propagation。
[Abstract]:As a supermaterial, the Artificial magnetic conductor (AMC) structure has the electromagnetic characteristic of the same phase reflection to the plane wave in a specific frequency range. It can be applied to the antenna design. It can break through the limit of the structure of the traditional antenna and bring a new design idea to the development of the antenna in the wireless communication system. In order to meet the development demand of high performance and intelligent millimeter wave system and mobile communication system, the development of the letter technology is becoming more and more demanding for the performance of the antenna. High efficiency and multifunction become the development trend of modern microwave millimeter wave antenna. Therefore, the structure of the new type of artificial magnetic conductor AMC is explored and the structure of AMC is carried out to improve the efficiency and reality of the antenna. In this paper, we have carried out a deep research work on the basic characteristics of the existing artificial magnetic conductor structure and its limitations in the research of the antenna application. The innovative work is mainly embodied in the publication of the paper and the application of the patent. The main content can be summarized as follows: 1. the high efficiency and integrated design of the LTCC millimeter wave antenna array based on the AMC structure: combining with the LTCC multilayer technology, the broadband, high gain milli wave microstrip antenna based on the AMC structure and the loss of the different transmission lines in the LTCC are proposed. The low loss double decker four LWG power network is proposed and the performance comparison and feasibility analysis are carried out with other network schemes. The improved design of the transition structure of the compact LWG and the rectangular waveguide is proposed, and the back to back test parts are used to verify the transmission performance, and the efficient Ka band 4 x 4 set is developed by combining the above work. Two engineering improvements are proposed to improve the performance of antenna arrays. Through physical testing, it is proved that the proposed integrated antenna array has good radiation performance. This work provides a great reference for the design of the millimeter wave system based on LTCC technology. This part of the research results has been in the IEEE Transactions on. Antennas and Propagation periodicals and 2013 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference. Application: a new type of AMC structure loaded with joint is proposed and the equivalent circuit analysis is given. It is applied to the microstrip antenna. The effect of the non periodic arrangement of the joint on the performance of the antenna is analyzed. The distribution uniformity of the surface current of the AMC structure and the antenna radiant aperture field is improved by optimizing the non periodic arrangement of the load section. The bandwidth and gain of the line are obviously improved. On this basis, the AMC structure is equivalent to a rectangular AMC structure. Combined with the idea of parasitic patch, the size periodicity and the periodicity of the AMC structure are broken at the same time, the design of three high performance microstrip antennas is proposed, and the high efficiency and broadband efficiency are verified by experiments. This part of the work provides a greater development space for high performance antenna design. This part of the research has been published on the IEEE Antennas and Wireless Propagation Letters journal and 2015 Asia-Pacific Microwave Conference, in which a high gain microstrip antenna based on a node loaded AMC structure has been applied for the application of a high gain Microstrip antenna. .3. new type of AMC structure with polarization and torsion function and its characteristics analysis: a new type of artificial magnetic conductor with polarization torsion function is first proposed, the mechanism of polarization torsion is analyzed, and a more accurate equivalent circuit is put forward. Based on the two-dimensional Floquet harmonic analysis theory, the distribution of the surface reflection field is studied and the derivation is derived. The relationship between the two-dimensional reflection coefficient and the surface impedance matrix is obtained. According to the amplitude and phase distribution of the two-dimensional reflection coefficient, the polarization and torsion characteristics and its influencing factors are further analyzed. A AMC structure with a wide polarization torsion band and a circular polarization wave with a comprehensive field in the band is designed. Furthermore, the structure evolution and performance comparison are also carried out. The design idea of the polarized torsional AMC structure is summarized. This part provides a good theoretical guide for the theoretical analysis and design of the AMC structure. The results have been published on the IEEE Transactions on Antennas and Propagation, IET Electronics Letters periodicals and 2014 European. Line and wave propagation / microwave theory and technology Hongkong branch sponsored by the Hongkong branch, the fifteenth graduate student competition held by Chinese University Hong Kong, the first prize for the best paper award for the antenna and wave propagation group, and the application of a low profile polarized torsional reflector based on artificial magnetic conductors to invent a special.4. polarization torsion AMC structure in the new low profile Application of wide beam circular polarized antenna and Polarization Reconfigurable Antenna: the proposed polarization torsional AMC structure is applied to the dipole antenna. Using its special polarization and torsion characteristics, two new type of circular polarized dipole antennas with low profile, wide band and wide beam are proposed, and their performance is compared, and the polarization torsion based on bimetallic columns is found. The antenna with AMC structure can achieve better symmetry and better wide beam circular polarization characteristics with low elevation characteristics. On this basis, the polarization torsional AMC structure is combined with a cross dipole antenna, and a multi polarized antenna with three polarization states, which can realize right circular polarization, left circular polarization and +45 degree line polarization, is proposed. Three new polarization reconfigurable antennas with fast polarization switching are realized. This part provides a good design scheme for the realization of novel and simple reconfigurable antennas. It provides a technical reference for the multi-functional performance requirements of modern wireless communication systems. This part of the work is combined with the previous work and has been in the IEEE T The ransactions on Antennas and Propagation journal and the Asia-Pacific Conference on Antennas and Propagation are published in 2015; and 1 also have been recorded for IEEE.

【学位授予单位】：南京理工大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN820

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