基于电磁超介质的太赫兹幅度调制器研究

发布时间：2018-04-20 09:15

  本文选题：太赫兹 + 开口谐振环　； 参考：《重庆邮电大学》2016年硕士论文

【摘要】：太赫兹波(Terahertz,THz)位于微波段与红外波段之间,由于太赫兹器件的缺乏,导致太赫兹技术发展缓慢。电磁超介质是一种具有天然媒质所不具备的超常物理性质的人工复合结构或复合媒质,主要包括细金属线、Swiss环、频率选择表面(frequency-selective surface,FSS)以及开口谐振环(split ring resonator,SRR)等一系列结构。开口谐振环是一类由一个或多个带有缝隙的金属图形组成的结构,可通过改变自身结构对太赫兹波作出有效的响应,在太赫兹技术中有广阔的应用前景。本文设计了三款基于SRR的太赫兹幅度调制器,其调制性能良好,可用于太赫兹大气通信Ⅳ窗口(627-711GHz),具有一定的参考和实用价值。首先,概述了超介质的结构,用等效媒质理论描述超介质的基本电磁特性,阐述了超介质电磁参数提取方法,利用等效电路法分析开口环谐振结构的谐振特性;随后,对电磁超介质的透射特性进行了详细地研究,讨论了SRR金属层材料、几何尺寸,衬底材料、加载方式、厚度,以及SRR单元多层结构对其透射特性的影响,同时分析了不同SRR结构透射特性的稳定性,对比了不同类型SRR结构的透射性能。最后,设计了三款工作在太赫兹大气通信Ⅳ窗口的SRR幅度调制器,三款幅度调制器的工作频率均为669GHz,调制深度在80%附近,插入损耗在1d B左右。三款调制器分别表现出了各自不同的优点:单开口SRR幅度调制器的结构最简单,易于后期制作实物且尺寸误差很小;改进型双开口SRR幅度调制器的插入损耗较低,调制性能稳定;四开口SRR幅度调制器的调制深度较高,结构灵活可控。综上,本文所设计的基于SRR的太赫兹幅度调制器性能良好,可工作于太赫兹大气通信Ⅳ窗口,用于太赫兹大气通信。
[Abstract]:Terahertzt THz) is located between the microwave band and the infrared band. Due to the lack of terahertz devices, the development of terahertz technology is slow. Electromagnetic supermedia is a kind of artificial composite structure or composite medium with supernormal physical properties which is not possessed by natural medium. It mainly includes fine metal wire Swiss ring, frequency-selective surface FSS (frequency selective surface) and split ring resonator (SRR) of open resonant ring, etc. The open resonant ring is a kind of structure which is composed of one or more metal shapes with gaps. It can respond to terahertz wave effectively by changing its own structure. It has a broad application prospect in terahertz technology. In this paper, three terahertz amplitude modulators based on SRR are designed. They have good modulation performance and can be used in terahertz atmospheric communication window 627-711GHz, which has certain reference and practical value. Firstly, the structure of supermedia is summarized, the basic electromagnetic characteristics of supermedium are described by equivalent medium theory, the extraction method of electromagnetic parameters of supermedia is expounded, and the resonant characteristics of resonant structure of open ring are analyzed by equivalent circuit method. The transmission characteristics of electromagnetic supermedia are studied in detail. The effects of SRR metal layer material, geometric dimension, substrate material, loading mode, thickness and multilayer structure of SRR element on its transmission characteristics are discussed. At the same time, the stability of transmission characteristics of different SRR structures is analyzed, and the transmission properties of different types of SRR structures are compared. Finally, three SRR amplitude modulators operating in terahertz atmosphere communication window 鈪，

本文编号：1777169