發(fā)布時間：2018-05-19 03:18

  本文選題：頻率選擇表面 + 雙波束合成器�。� 參考：《西安電子科技大學》2014年碩士論文

【摘要】：頻率選擇表面FSS(Frequency Selective Surface)是一種平面二維周期性陣列結構,這種結構對不同頻段的電磁波可以呈現(xiàn)不同的反射或者透射特性,本質上是一個空間電磁濾波器。隨著科技的不斷進步與發(fā)展,頻率選擇表面已經越來越多的應用于微波、紅外波及可見光波段。近年來,國內外的學者及研究機構不斷對頻率選擇表面進行各種深入的研究與分析,人們對頻率選擇表面各種特性的認識也日趨完善。如何將頻率選擇表面優(yōu)良的電磁選擇特性應用到實際生產生活中以發(fā)揮其最大價值,已然成為現(xiàn)階段對頻率選擇表面研究的主要方向。針對頻率選擇表面在實際應用中的問題,本文主要從以下幾個方面展開了分析研究與仿真設計:1、本文基于航空科學基金項目:毫米波/紅外成像雙模制導目標模擬技術的研究要求,對其中的關鍵技術——雙波束合成器進行了深入的研究和分析。應用頻率選擇表面設計了毫米波/紅外雙波束合成器,實現(xiàn)了透射毫米波而反射紅外的雙工性能。介紹了頻率選擇表面的概念和工作機理,采用Floquet理論對包括頻率選擇表面在內的平面周期結構陣列進行了理論分析,討論了影響頻率選擇表面的因素,介紹了設計頻率選擇表面的方法。按照項目技術指標要求,設計了一種十字環(huán)縫隙頻率選擇表面,該FSS采用正方形柵格排布,對入射波的不同狀態(tài)具有穩(wěn)定的中心頻率和帶寬,對8mm波段的毫米波呈透射性能,對紅外信號呈反射性能。2、制作了頻率選擇表面樣品,并在微波暗室中對樣品進行8mm波的透過率測試,根據(jù)測試結果分析了加工誤差對透射性能的影響并提出了相應的解決方法。根據(jù)查閱大量文獻資料內容,理論上分析了樣品的紅外信號反射性能,得出了樣品的紅外反射率可以滿足項目技術指標的結論。3、在頻率選擇表面應用于雙波束合成器時,不同的介質加載結構會對其性能產生影響。本文對不同的介質加載形式對頻率選擇表面頻率響應特性的影響進行深入的分析。在對比了三種不同介質加載結構的頻率選擇表面的電磁特性之后,設計了一種介質在雙層頻率選擇表面之間加載的陣列結構,并進行了仿真分析,解決了傳統(tǒng)雙層結構中電磁波大角度入射時柵瓣出現(xiàn)的問題。4、本文對分形結構理論在頻率選擇表面設計中的應用進行了研究,并以經典的“Y”型結構為例,采用二階Y孔分形單元結構,仿真設計了一種分形頻率選擇表面。該頻率選擇表面結構對稱,抗交叉極化特性好,對8mm和3mm波段的毫米波呈透射性能,對紅外信號呈反射性能,不僅滿足雙波束合成器的使用要求,而且對8mm和3mm毫米波/紅外復合制導體制均適用。通過對仿真結果的詳細分析得出了分形結構在頻率選擇表面中應用的特性和規(guī)律,對分形理論在頻率選擇表面中的應用具有一定的參考價值。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN822

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本文編號：1908484