本文選題：太赫茲 + 開口諧振環(huán)��； 參考：《重慶郵電大學》2016年碩士論文

【摘要】：太赫茲波(Terahertz,THz)位于微波段與紅外波段之間,由于太赫茲器件的缺乏,導致太赫茲技術發(fā)展緩慢。電磁超介質是一種具有天然媒質所不具備的超常物理性質的人工復合結構或復合媒質,主要包括細金屬線、Swiss環(huán)、頻率選擇表面(frequency-selective surface,FSS)以及開口諧振環(huán)(split ring resonator,SRR)等一系列結構。開口諧振環(huán)是一類由一個或多個帶有縫隙的金屬圖形組成的結構,可通過改變自身結構對太赫茲波作出有效的響應,在太赫茲技術中有廣闊的應用前景。本文設計了三款基于SRR的太赫茲幅度調制器,其調制性能良好,可用于太赫茲大氣通信Ⅳ窗口(627-711GHz),具有一定的參考和實用價值。首先,概述了超介質的結構,用等效媒質理論描述超介質的基本電磁特性,闡述了超介質電磁參數(shù)提取方法,利用等效電路法分析開口環(huán)諧振結構的諧振特性;隨后,對電磁超介質的透射特性進行了詳細地研究,討論了SRR金屬層材料、幾何尺寸,襯底材料、加載方式、厚度,以及SRR單元多層結構對其透射特性的影響,同時分析了不同SRR結構透射特性的穩(wěn)定性,對比了不同類型SRR結構的透射性能。最后,設計了三款工作在太赫茲大氣通信Ⅳ窗口的SRR幅度調制器,三款幅度調制器的工作頻率均為669GHz,調制深度在80%附近,插入損耗在1d B左右。三款調制器分別表現(xiàn)出了各自不同的優(yōu)點:單開口SRR幅度調制器的結構最簡單,易于后期制作實物且尺寸誤差很小;改進型雙開口SRR幅度調制器的插入損耗較低,調制性能穩(wěn)定;四開口SRR幅度調制器的調制深度較高,結構靈活可控。綜上,本文所設計的基于SRR的太赫茲幅度調制器性能良好,可工作于太赫茲大氣通信Ⅳ窗口,用于太赫茲大氣通信。
[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，

本文編號：1777169