【摘要】：在近幾年時間里,太赫茲技術發(fā)展非常迅速。除了傳統(tǒng)的太赫茲產(chǎn)生和太赫茲檢測設備外,太赫茲濾波器、吸收器等能改善傳輸過程和性能的太赫茲器件也成為了研究的熱點。因此,研究太赫茲濾波器的參數(shù)變化對性能的影響并設計出性能優(yōu)秀的太赫茲濾波器成為了一大研究重點。超材料是一種具有特殊性質(zhì)的人工合成材料。經(jīng)過適當?shù)脑O計,可以得到具有濾波器性能的超材料結(jié)構(gòu),超材料的出現(xiàn)為研究和設計太赫茲器件提供了極大的便利。 本文主要通過理論分析以及軟件仿真對基于柔性超材料的太赫茲濾波器進行設計與分析,討論了多個參數(shù)對太赫茲濾波器性能的影響,并設計了一款性能優(yōu)良的太赫茲濾波器。 首先,通過閱讀相關文獻了解超材料的性質(zhì)并利用MetalMUMPs工藝及相關知識在亞微米尺度下設計了多種單層太赫茲超材料結(jié)構(gòu),包括正方框型超材料結(jié)構(gòu)、圓環(huán)型太赫茲超材料結(jié)構(gòu)等。同時,對多層超材料結(jié)構(gòu)構(gòu)成濾波器的原理進行了分析和討論,并根據(jù)單層結(jié)構(gòu)設計了多種多層太赫茲超材料濾波器結(jié)構(gòu)。 然后,利用CST Microwave Studio仿真平臺對單層和多層超材料結(jié)構(gòu)進行了仿真,研究并討論了多個參數(shù)對性能的影響,包括金屬條的寬度與長度,單層金屬結(jié)構(gòu)之間的距離,多層金屬結(jié)構(gòu)兩層之間的距離對濾波器性能的影響等。同時實現(xiàn)了多種帶阻頻率范圍在0.5THz左右,吸收率均在95%以上,且上升沿平均斜率在115dB/THz的太赫茲濾波器,積累了大量的設計與仿真經(jīng)驗。 最后,在此基礎上,通過大膽創(chuàng)新,設計了一款性能優(yōu)良的基于超材料的太赫茲帶阻濾波器,并對其進行了仿真和分析。此濾波器的中心頻率在1.45THz,具有1.5THz左右的帶阻頻率范圍,并且在帶阻頻率范圍內(nèi)保持99.9%左右的吸收率峰值,且上升沿的平均斜率達到450dB/THz。此種超材料結(jié)構(gòu)非常新穎,具有一定的借鑒意義和研究價值。
[Abstract]:In recent years, terahertz technology has developed very rapidly. In addition to traditional THz generation and THz detection devices, terahertz devices such as terahertz filters and absorbers, which can improve the transmission process and performance, have also become the focus of research. Therefore, studying the effect of the parameters of THz filter on the performance and designing a terahertz filter with excellent performance has become a major research focus. Metamaterials are synthetic materials with special properties. After proper design, the supermaterial structure with filter performance can be obtained. The appearance of supermaterial provides great convenience for the research and design of terahertz devices. In this paper, the THz filter based on flexible supermaterial is designed and analyzed by theoretical analysis and software simulation. The influence of several parameters on the performance of THz filter is discussed, and a terahertz filter with excellent performance is designed. First of all, the properties of metamaterials were studied by reading the relevant literature, and a variety of monolayer terahertz supermaterial structures were designed at submicron scale using MetalMUMPs process and related knowledge, including square frame supermaterial structures. Ring type terahertz metamaterial structure and so on. At the same time, the principle of multi-layer supermaterial structure is analyzed and discussed, and the multi-layer terahertz supermaterial filter structure is designed according to the single-layer structure. Then, the effects of several parameters on the performance of single-layer and multi-layer metamaterials are studied and discussed by using CST Microwave Studio simulation platform, including the width and length of metal strip, the distance between monolayer metal structures. The influence of the distance between two layers of multilayer metal structure on the performance of the filter. At the same time, many kinds of THz filters with average slope of rise edge in 115dB/THz are realized in the range of 0.5THz and absorptivity above 95%, which has accumulated a lot of experience in design and simulation. Finally, through bold innovation, a terahertz band-stop filter with excellent performance based on metamaterials is designed and simulated and analyzed. The center frequency of the filter is 1.45 THZ, with the band stop frequency range of about 1.5THz, and the absorption peak value of 99.9% in the band stop frequency range, and the average slope of rising edge is 450 dB / THZ. This kind of metamaterial structure is very novel and has certain reference meaning and research value.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713

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本文編號：2238587