毫米波带通频率选择表面的研究

发布时间：2018-05-19 03:18

本文选题：频率选择表面 + 双波束合成器　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：频率选择表面FSS(Frequency Selective Surface)是一种平面二维周期性阵列结构,这种结构对不同频段的电磁波可以呈现不同的反射或者透射特性,本质上是一个空间电磁滤波器。随着科技的不断进步与发展,频率选择表面已经越来越多的应用于微波、红外波及可见光波段。近年来,国内外的学者及研究机构不断对频率选择表面进行各种深入的研究与分析,人们对频率选择表面各种特性的认识也日趋完善。如何将频率选择表面优良的电磁选择特性应用到实际生产生活中以发挥其最大价值,已然成为现阶段对频率选择表面研究的主要方向。针对频率选择表面在实际应用中的问题,本文主要从以下几个方面展开了分析研究与仿真设计:1、本文基于航空科学基金项目:毫米波/红外成像双模制导目标模拟技术的研究要求,对其中的关键技术——双波束合成器进行了深入的研究和分析。应用频率选择表面设计了毫米波/红外双波束合成器,实现了透射毫米波而反射红外的双工性能。介绍了频率选择表面的概念和工作机理,采用Floquet理论对包括频率选择表面在内的平面周期结构阵列进行了理论分析,讨论了影响频率选择表面的因素,介绍了设计频率选择表面的方法。按照项目技术指标要求,设计了一种十字环缝隙频率选择表面,该FSS采用正方形栅格排布,对入射波的不同状态具有稳定的中心频率和带宽,对8mm波段的毫米波呈透射性能,对红外信号呈反射性能。2、制作了频率选择表面样品,并在微波暗室中对样品进行8mm波的透过率测试,根据测试结果分析了加工误差对透射性能的影响并提出了相应的解决方法。根据查阅大量文献资料内容,理论上分析了样品的红外信号反射性能,得出了样品的红外反射率可以满足项目技术指标的结论。3、在频率选择表面应用于双波束合成器时,不同的介质加载结构会对其性能产生影响。本文对不同的介质加载形式对频率选择表面频率响应特性的影响进行深入的分析。在对比了三种不同介质加载结构的频率选择表面的电磁特性之后,设计了一种介质在双层频率选择表面之间加载的阵列结构,并进行了仿真分析,解决了传统双层结构中电磁波大角度入射时栅瓣出现的问题。4、本文对分形结构理论在频率选择表面设计中的应用进行了研究,并以经典的“Y”型结构为例,采用二阶Y孔分形单元结构,仿真设计了一种分形频率选择表面。该频率选择表面结构对称,抗交叉极化特性好,对8mm和3mm波段的毫米波呈透射性能,对红外信号呈反射性能,不仅满足双波束合成器的使用要求,而且对8mm和3mm毫米波/红外复合制导体制均适用。通过对仿真结果的详细分析得出了分形结构在频率选择表面中应用的特性和规律,对分形理论在频率选择表面中的应用具有一定的参考价值。
[Abstract]:Frequency selective Surface (FSS(Frequency Selective Surface) is a planar two-dimensional periodic array structure, which can reflect or transmit different electromagnetic waves in different frequency bands, and is essentially a spatial electromagnetic filter. With the development of science and technology, frequency-selective surface has been applied to microwave, infrared and visible light. In recent years, scholars and research institutions at home and abroad have carried out a variety of in-depth research and analysis on the frequency selective surface, and people's understanding of the various characteristics of the frequency selective surface is becoming more and more perfect. How to apply the excellent electromagnetic selection characteristics of frequency-selective surface to practical production and life to give full play to its maximum value has become the main direction of the research on frequency-selective surface at present. Aiming at the problem of frequency selective surface in practical application, In this paper, the analysis research and simulation design are mainly carried out from the following aspects. This paper is based on the aviation science foundation project: millimeter wave / infrared imaging dual-mode guidance target simulation technology research requirements, The key technology-dual-beam synthesizer is deeply studied and analyzed. A millimeter-wave / infrared dual-beam synthesizer is designed using frequency-selective surface to realize the duplex performance of transmitting millimeter-wave and reflecting infrared. This paper introduces the concept and working mechanism of frequency-selective surface, analyzes the planar periodic structure array including frequency-selective surface by using Floquet theory, and discusses the factors that affect the frequency-selective surface. The design method of frequency selective surface is introduced. According to the technical requirements of the project, a cross ring slot frequency selective surface is designed. The FSS is arranged with square grid, which has stable center frequency and bandwidth for different states of incident wave, and transmission performance to millimeter wave in 8mm band. The reflectivity of infrared signal was 0.2. the frequency selective surface samples were made, and the transmittance of 8mm wave was measured in the microwave darkroom. According to the test results, the influence of processing error on transmission performance was analyzed and the corresponding solution was put forward. According to a large amount of literature, the reflectivity of the infrared signal of the sample is analyzed theoretically, and the conclusion that the infrared reflectivity of the sample can meet the technical specifications of the project is obtained. The infrared reflectivity of the sample is applied to the dual-beam synthesizer on the frequency selective surface. Different dielectric loading structures have an effect on their performance. In this paper, the influence of different media loading forms on the frequency response characteristics of the frequency selective surface is analyzed. After comparing the electromagnetic characteristics of the frequency selective surfaces of three different dielectric loading structures, an array structure with medium loading between the double-layer frequency selective surfaces is designed, and the simulation analysis is carried out. In this paper, the application of fractal structure theory to the design of frequency-selective surface is studied, and the classical "Y" structure is taken as an example. A fractal frequency selective surface is designed by using the second order Y-hole fractal unit structure. The frequency selective surface structure is symmetrical, the cross-polarization resistance is good, the transmission performance of millimeter wave in 8mm and 3mm band, and the reflection performance to infrared signal, which not only meet the requirements of dual-beam synthesizer, but also meet the requirements of dual-beam synthesizer. It is also applicable to 8mm and 3mm millimeter wave / infrared composite guidance systems. Through the detailed analysis of the simulation results, the characteristics and rules of the fractal structure applied in the frequency selective surface are obtained, which has certain reference value for the application of the fractal theory in the frequency selective surface.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN822

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