本文選題：頻率選擇表面(FSS)　切入點(diǎn)：極化　出處：《南京理工大學(xué)》2015年碩士論文

【摘要】：頻率選擇表面是一種空間電磁波濾波器件,這種器件比傳統(tǒng)濾波器在空間電磁波信號(hào)選擇方面有獨(dú)特優(yōu)勢(shì),頻率選擇表面在電磁隱身、電子對(duì)抗等領(lǐng)域的巨大應(yīng)用價(jià)值使其在軍用、民用方面得到廣泛應(yīng)用,在軍事應(yīng)用方面,其最重要的應(yīng)用就是作為隱身雷達(dá)罩。本文從理論和工程仿真兩個(gè)方面對(duì)FSS進(jìn)行研究和探討。在理論方面,介紹了包括FSS的基本分析理論、物理工作機(jī)制、常見的FSS單元類型,采用等效電路模型分析縫隙型和貼片型單元的傳輸網(wǎng)絡(luò)。在工程仿真方面,以Y型縫隙FSS單元為例,分別從單元臂長、介質(zhì)層厚度、介電常數(shù)、介質(zhì)加載方式、單元縫隙寬度、入射波角度、極化方式和單元間距等角度,仿真分析了以上基本參數(shù)改變對(duì)頻率選擇表面頻率傳輸響應(yīng)特性的影響。在傳輸特性理論分析方面,分別詳述了用模式匹配法和譜域分析法分析貼片單元和縫隙單元散射參數(shù)的方法。最后闡述了電磁波極化概念、極化類型和表示方法。通過仿真分析Y環(huán)形FSS和Y縫隙型單元基本參數(shù)對(duì)傳輸曲線的影響,對(duì)兩種單元的排列方式和旋轉(zhuǎn)角度對(duì)傳輸曲線極化穩(wěn)定性進(jìn)行深入的仿真研究,發(fā)現(xiàn)在正方形排列方式和三角形排列方式下,兩種FSS單元各自以不同方式旋轉(zhuǎn)某種角度后傳輸曲線均可獲得更穩(wěn)定極化穩(wěn)定性。在綜合仿真設(shè)計(jì)方面,首先介紹多層FSS電磁散射特性的分析方法,以方環(huán)形FSS單元為例,探索多屏FSS的仿真設(shè)計(jì)方法,多屏FSS具有更寬的傳輸帶寬、更陡峭的邊帶傳輸特性,且傳輸特性更穩(wěn)定,但是設(shè)計(jì)難度系數(shù)高,通帶插損大。從單元緊湊、小型化設(shè)計(jì)角度出發(fā),通過十字單元小型化前后性能進(jìn)行仿真對(duì)比發(fā)現(xiàn)小型化FSS設(shè)計(jì)性能得到改善。設(shè)計(jì)一種新型小型、高極化穩(wěn)定性的FSS單元,并對(duì)該新型單元進(jìn)行雙屏設(shè)計(jì),通過反復(fù)優(yōu)化介質(zhì)層的厚度和介電常數(shù),最終獲得良好的頻率傳輸響應(yīng)特性。
[Abstract]:The frequency-selective surface is a kind of spatial electromagnetic wave filter. This kind of device has a unique advantage over the traditional filter in the space electromagnetic wave signal selection.The great application value of electronic countermeasures makes it widely used in military and civil fields. In military applications, its most important application is as stealth radome.In this paper, FSS is studied from two aspects of theory and engineering simulation.In theory, the basic analysis theory, physical working mechanism, common type of FSS unit are introduced, and the equivalent circuit model is used to analyze the transmission network of slot type and patch type unit.In the aspect of engineering simulation, taking Y-type slot FSS element as an example, from the angles of arm length, dielectric layer thickness, dielectric constant, dielectric loading mode, gap width, incident wave angle, polarization mode and cell spacing, etc.The effects of the basic parameters above on the frequency transmission response of the frequency selective surface are simulated and analyzed.In the theoretical analysis of transmission characteristics, the scattering parameters of patch element and slot element are analyzed by mode matching method and spectral domain analysis method, respectively.Finally, the concept, type and representation of electromagnetic wave polarization are described.The influence of the basic parameters of Y ring FSS and Y slot elements on the transmission curve is analyzed by simulation. The polarization stability of the transmission curve is studied by the arrangement of the two units and the rotation angle.It is found that the transmission curves of the two kinds of FSS elements can obtain more stable polarization stability after rotating a certain angle in different ways under the square arrangement and triangle arrangement.In the aspect of synthetic simulation design, the analysis method of electromagnetic scattering characteristics of multi-layer FSS is introduced firstly. Taking square ring FSS unit as an example, the simulation design method of multi-screen FSS is explored. The multi-screen FSS has wider transmission bandwidth and steeper sideband transmission characteristics.And the transmission characteristic is more stable, but the design difficulty coefficient is high, the passband insertion loss is big.From the point of view of compact and miniaturized design of unit, the performance of miniaturized FSS is improved by simulation before and after miniaturization of cross unit.A new type of small, highly polarization-stable FSS element is designed and designed with double screens. By repeatedly optimizing the thickness and dielectric constant of the dielectric layer, a good frequency transmission response is obtained.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 徐念喜;高勁松;馮曉國;趙晶麗;梁鳳超;王巖松;陳新;王珊珊;朱華新;;一種適用于隱身天線罩的頻率選擇表面新單元研究[A];第七屆中國功能材料及其應(yīng)用學(xué)術(shù)會(huì)議論文集（第5分冊(cè)）[C];2010年

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本文編號(hào)：1728260