基于超材料的THz超薄吸波体设计及研究

发布时间：2018-03-09 09:49

本文选题：超材料吸波体　切入点：太赫兹　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：超材料是一种人为构造的新型结构材料,具有天然材料所不具备的超常电磁特性,为操控电磁波提供了一种新的途径。太赫兹技术由于其独有的特性及潜在的应用价值,使太赫兹频段的调控器件成为研究热点之一。但自然界的大多数材料在太赫兹频段的电磁响应均较弱,而超材料的出现为太赫兹技术的发展和应用提供了新的机遇。本文主要开展了微波及太赫兹双频超材料吸波体研究,并对太赫兹频段的超材料吸波体进行了设计、制作与测试。论文所做的主要工作及成果如下:(1)开展了X波段双频超材料吸波体的设计及仿真研究,通过表面电流及数值仿真分析得到,其在8.84GHz处吸收率达到98.86%,基板的厚度为其工作波长的1/70;在11.86GHz处吸收率为94.09%,基板的厚度为其工作波长的1/50。(2)开展了基于超材料的太赫兹超薄吸波体的研究工作,分析了入射角、电磁损耗、结构参数对超材料吸波体谐振频率和吸收率的影响。采用聚酰亚胺薄膜作为柔性基底,设计了双频柔性超材料吸波体,通过对其仿真分析得到,在100.65GHz处达到98.76%的吸收,在131.05GHz处达到94.64%的吸收,吸波体的厚度在两个谐振频点处分别为工作波长的1/58和1/44。(3)开展了THz超薄吸波体加工工艺的研究,采用MEMS光刻技术对超材料吸波体进行制备,得到了阵列为30×30为的超材料吸波体样品。对其吸收特性测试得到,和仿真结果相比,低频谐振频率红移了1.05GHz,高频谐振频率蓝移了1.45GHz。
[Abstract]:Metamaterials are a new type of artificial structural materials, which have the supernormal electromagnetic properties which are not possessed by natural materials, which provide a new way to manipulate electromagnetic waves. Terahertz technology has its unique characteristics and potential application value. It makes the control devices of terahertz band one of the research hotspots, but the electromagnetic response of most materials in nature is weak in the terahertz band. The appearance of metamaterials provides a new opportunity for the development and application of terahertz technology. In this paper, microwave and terahertz dual-frequency supermaterial absorbers are studied, and the supermaterial absorbers in terahertz band are designed. The main work and results of this paper are as follows: (1) the design and simulation of X-band dual-frequency supermaterial absorber are carried out, and the results are obtained by surface current and numerical simulation analysis. The absorptivity is 98.86 at 8.84 GHz, and the thickness of the substrate is 1 / 70 of its working wavelength; at 11.86 GHz, the absorptivity is 94.09, and the thickness of the substrate is 1 / 50. 2 of its working wavelength.) the ultra-thin terahertz absorber based on supermaterial is studied and the incident angle is analyzed. The effects of electromagnetic loss and structure parameters on the resonance frequency and absorptivity of the supermaterial were studied. Using polyimide film as the flexible substrate, the dual frequency flexible supermaterial absorber was designed. At 100.65 GHz and 94.64% GHz, the thickness of the absorber is 1/58 and 1 / 44.3of the working wavelength at the two resonant frequency points, respectively. The processing technology of the THz ultra-thin absorber is studied. MEMS photolithography was used to prepare the supermaterial absorber, and the supermaterial absorber sample with the array of 30 脳 30 was obtained. Compared with the simulation results, the low-frequency resonant frequency shifted 1.05 GHz red and the high-frequency resonant frequency blue-shifted 1.45 GHz.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB34

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