太赫兹传输线与天线技术的研究

发布时间：2018-01-16 00:25

本文关键词：太赫兹传输线与天线技术的研究　出处：《东南大学》2017年硕士论文　论文类型：学位论文

【摘要】：太赫兹(THz)科学技术作为一个发展迅速且极为重要的前沿研究领域,在高速无线通信、雷达、医学成像、安全检查、射电天文、电子对抗等不同的领域都有着巨大的应用潜力,对于推动国民经济发展、加强国家安全建设都有着重大的战略意义。基片集成波导(Substrate Integrated Waveguide,SIW)具有集成度高、功率容量高、可低成本大规模生产、加工精度高等优点,成为低成本平面太赫兹传输线设计的一种备选方案。为有效研究太赫兹SIW作为传输线的损耗特性,基于实际测试考虑,设计高性能太赫兹SIW到矩形波导的转接成为必要。此外,太赫兹天线作为太赫兹通信和辐射系统中的关键部分,其性能会直接影响整个系统的应用效果。利用低成本工艺实现紧凑且高增益的太赫兹天线是一个有价值的研究方向。本文针对太赫兹传输线和天线技术两方面,做了以下主要工作:1、首先概述了太赫兹科学技术的发展情况,之后分别介绍了太赫兹转接和太赫兹天线的研究背景和发展现状,然后阐述了矩形波导传输、基片集成波导设计以及几何光学(Geometrical Optics,GO)的相关基础理论。2、设计了一款太赫兹SIW-矩形波导转换器,详细讨论了转接结构对于传输系数中谐振点产生的具体影响,利用低成本PCB工艺对D波段和G波段SIW传输线进行了实物加工和测试验证,并对单个导波波长的太赫兹SIW传输线损耗特性和单个转接损耗进行了提取和分析,对损耗特性曲线中的波动进行了分析。证明了该方案可用来实现高性能太赫兹SIW-矩形波导转换器,同时有效探究了太赫兹SIW作为传输线的损耗特性。3、设计了一款太赫兹高增益金属透镜天线,详细阐述了设计原理和过程,从理论上提取和分析了透镜结构在宽频带上的相位补偿效果,利用低成本的金属铣削工艺分别对140GHz和412.5GHz天线进行了实物加工,之后在THz暗室中对S参数、增益、方向图进行了实际测试,并对天线损耗进行了分析。结果显示,140 GHz和412.5 GHz天线在对应频段内的实测最大增益分别达到27.2 dBi和27.7 dBi。验证了该方案用低成本金属铣削工艺来实现高增益太赫兹天线的可行性。
[Abstract]:Terahertz (THZ) Science and Technology as a rapidly developing and extremely important frontier research field in high-speed wireless communications, radar, medical imaging, security inspection, radio astronomy. Electronic countermeasures and other fields have great application potential for the promotion of national economic development. It is of great strategic significance to strengthen the construction of national security. Substrate Integrated guide SIWs are highly integrated. It has the advantages of high power capacity, low cost, large scale production and high machining precision. It has become an alternative to the design of low cost planar terahertz transmission line. In order to effectively study the loss characteristics of terahertz SIW as transmission line. Based on the practical test, it is necessary to design a high performance THz SIW to rectangular waveguide. In addition, THz antenna is a key part of THz communication and radiation system. Its performance will directly affect the application effect of the whole system. It is a valuable research direction to realize compact and high gain terahertz antenna with low cost technology. This paper focuses on terahertz transmission line and antenna technology. Firstly, the development of terahertz science and technology is summarized, then the research background and development status of terahertz switching and terahertz antenna are introduced respectively, and then rectangular waveguide transmission is expounded. A terahertz SIW-rectangular waveguide converter is designed based on the basic theory of Geometry Optics (GOG) and substrate integrated waveguide design. The influence of the transfer structure on the resonant point in the transmission coefficient is discussed in detail. The D band and G band SIW transmission lines are processed and tested by low cost PCB process. The loss characteristics of terahertz SIW transmission line and the single switching loss of a single guided wave wavelength are extracted and analyzed. The fluctuation in the loss characteristic curve is analyzed and it is proved that this scheme can be used to realize the high performance terahertz SIW- rectangular waveguide converter. At the same time, the loss characteristics of terahertz SIW as transmission line. 3. A terahertz high gain metal lens antenna is designed, and the design principle and process are described in detail. The phase compensation effect of lens structure in wide band is extracted and analyzed theoretically. The material processing of 140GHz antenna and 412.5GHz antenna are carried out by low cost metal milling technology. After that, the S parameters, gain and pattern are tested in the THz darkroom, and the antenna loss is analyzed. The measured maximum gain of 140 GHz and 412.5 GHz antennas in the corresponding frequency band is 27.2 dBi and 27.7 respectively. D Bi. verifies the feasibility of using low cost metal milling technology to realize high gain THz antenna.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN811;TN820

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