基于柔性超材料的太赫兹频段滤波器研究

发布时间：2018-09-12 09:24

【摘要】：在近几年时间里,太赫兹技术发展非常迅速。除了传统的太赫兹产生和太赫兹检测设备外,太赫兹滤波器、吸收器等能改善传输过程和性能的太赫兹器件也成为了研究的热点。因此,研究太赫兹滤波器的参数变化对性能的影响并设计出性能优秀的太赫兹滤波器成为了一大研究重点。超材料是一种具有特殊性质的人工合成材料。经过适当的设计,可以得到具有滤波器性能的超材料结构,超材料的出现为研究和设计太赫兹器件提供了极大的便利。本文主要通过理论分析以及软件仿真对基于柔性超材料的太赫兹滤波器进行设计与分析,讨论了多个参数对太赫兹滤波器性能的影响,并设计了一款性能优良的太赫兹滤波器。首先,通过阅读相关文献了解超材料的性质并利用MetalMUMPs工艺及相关知识在亚微米尺度下设计了多种单层太赫兹超材料结构,包括正方框型超材料结构、圆环型太赫兹超材料结构等。同时,对多层超材料结构构成滤波器的原理进行了分析和讨论,并根据单层结构设计了多种多层太赫兹超材料滤波器结构。然后,利用CST Microwave Studio仿真平台对单层和多层超材料结构进行了仿真,研究并讨论了多个参数对性能的影响,包括金属条的宽度与长度,单层金属结构之间的距离,多层金属结构两层之间的距离对滤波器性能的影响等。同时实现了多种带阻频率范围在0.5THz左右,吸收率均在95%以上,且上升沿平均斜率在115dB/THz的太赫兹滤波器,积累了大量的设计与仿真经验。最后,在此基础上,通过大胆创新,设计了一款性能优良的基于超材料的太赫兹带阻滤波器,并对其进行了仿真和分析。此滤波器的中心频率在1.45THz,具有1.5THz左右的带阻频率范围,并且在带阻频率范围内保持99.9%左右的吸收率峰值,且上升沿的平均斜率达到450dB/THz。此种超材料结构非常新颖,具有一定的借鉴意义和研究价值。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

【参考文献】