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(xué)》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(jié)構(gòu),這種結(jié)構(gòu)對(duì)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(zhì)上是一個(gè)空間電磁濾波器。隨著科技的不斷進(jìn)步與發(fā)展,頻率選擇表面已經(jīng)越來(lái)越多的應(yīng)用于微波、紅外波及可見(jiàn)光波段。近年來(lái),國(guó)內(nèi)外的學(xué)者及研究機(jī)構(gòu)不斷對(duì)頻率選擇表面進(jìn)行各種深入的研究與分析,人們對(duì)頻率選擇表面各種特性的認(rèn)識(shí)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(yīng)用到實(shí)際生產(chǎn)生活中以發(fā)揮其最大價(jià)值,已然成為現(xiàn)階段對(duì)頻率選擇表面研究的主要方向。針對(duì)頻率選擇表面在實(shí)際應(yīng)用中的問(wèn)題,本文主要從以下幾個(gè)方面展開(kāi)了分析研究與仿真設(shè)計(jì):1、本文基于航空科學(xué)基金項(xiàng)目:毫米波/紅外成像雙模制導(dǎo)目標(biāo)模擬技術(shù)的研究要求,對(duì)其中的關(guān)鍵技術(shù)——雙波束合成器進(jìn)行了深入的研究和分析。應(yīng)用頻率選擇表面設(shè)計(jì)了毫米波/紅外雙波束合成器,實(shí)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(jī)理,采用Floquet理論對(duì)包括頻率選擇表面在內(nèi)的平面周期結(jié)構(gòu)陣列進(jìn)行了理論分析,討論了影響頻率選擇表面的因素,介紹了設(shè)計(jì)頻率選擇表面的方法。按照項(xiàng)目技術(shù)指標(biāo)要求,設(shè)計(jì)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(duì)入射波的不同狀態(tài)具有穩(wěn)定的中心頻率和帶寬,對(duì)8mm波段的毫米波呈透射性能,對(duì)紅外信號(hào)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(duì)樣品進(jìn)行8mm波的透過(guò)率測(cè)試,根據(jù)測(cè)試結(jié)果分析了加工誤差對(duì)透射性能的影響并提出了相應(yīng)的解決方法。根據(jù)查閱大量文獻(xiàn)資料內(nèi)容,理論上分析了樣品的紅外信號(hào)反射性能,得出了樣品的紅外反射率可以滿足項(xiàng)目技術(shù)指標(biāo)的結(jié)論。3、在頻率選擇表面應(yīng)用于雙波束合成器時(shí),不同的介質(zhì)加載結(jié)構(gòu)會(huì)對(duì)其性能產(chǎn)生影響。本文對(duì)不同的介質(zhì)加載形式對(duì)頻率選擇表面頻率響應(yīng)特性的影響進(jìn)行深入的分析。在對(duì)比了三種不同介質(zhì)加載結(jié)構(gòu)的頻率選擇表面的電磁特性之后,設(shè)計(jì)了一種介質(zhì)在雙層頻率選擇表面之間加載的陣列結(jié)構(gòu),并進(jìn)行了仿真分析,解決了傳統(tǒng)雙層結(jié)構(gòu)中電磁波大角度入射時(shí)柵瓣出現(xiàn)的問(wèn)題。4、本文對(duì)分形結(jié)構(gòu)理論在頻率選擇表面設(shè)計(jì)中的應(yīng)用進(jìn)行了研究,并以經(jīng)典的“Y”型結(jié)構(gòu)為例,采用二階Y孔分形單元結(jié)構(gòu),仿真設(shè)計(jì)了一種分形頻率選擇表面。該頻率選擇表面結(jié)構(gòu)對(duì)稱,抗交叉極化特性好,對(duì)8mm和3mm波段的毫米波呈透射性能,對(duì)紅外信號(hào)呈反射性能,不僅滿足雙波束合成器的使用要求,而且對(duì)8mm和3mm毫米波/紅外復(fù)合制導(dǎo)體制均適用。通過(guò)對(duì)仿真結(jié)果的詳細(xì)分析得出了分形結(jié)構(gòu)在頻率選擇表面中應(yīng)用的特性和規(guī)律,對(duì)分形理論在頻率選擇表面中的應(yīng)用具有一定的參考價(jià)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(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN822

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本文編號(hào)：1908484