本文選題：雙帶頻率選擇表面 + 方環(huán)　； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：由于在軍事和航空領(lǐng)域獨(dú)到的性能和應(yīng)用,頻率選擇表面從2000年以來逐漸成為研究人員的集中研究課題。頻率選擇表面(FSS)類似于空間微波濾波器,在周期單元尺寸對(duì)應(yīng)的諧振頻率一定帶寬內(nèi)分別表現(xiàn)出反射和傳輸?shù)奶匦孕纬蔀V波的效果。設(shè)計(jì)多頻帶、基于立體結(jié)構(gòu)和微型化FSS是國(guó)內(nèi)外專家近幾年來的研究趨勢(shì)。首先總結(jié)對(duì)頻率選擇表面常用的有效計(jì)算方法,采用等效電路法對(duì)典型結(jié)構(gòu)形狀的頻率選擇表面進(jìn)行理論分析,據(jù)此得到等效電路模型,從理論上計(jì)算出結(jié)構(gòu)單元參數(shù)和頻率選擇表面特性的關(guān)系,并采用MATLAB計(jì)算與全波數(shù)值計(jì)算結(jié)果比較驗(yàn)證。其次提出基于十字加載和方環(huán)的雙頻穩(wěn)定結(jié)構(gòu)單元,并研究了所構(gòu)成的FSS電特性,包括分析平面波垂直入射時(shí)的透射響應(yīng)曲線、比較改變?nèi)肷浣菚r(shí)曲線變化結(jié)果等。通過分析和實(shí)驗(yàn)測(cè)試結(jié)果均說明入射角穩(wěn)定性一致,在?60?內(nèi)FSS表現(xiàn)出良好選擇性和斜入射穩(wěn)定性。利用FSS天線罩與圓極化天線一體化設(shè)計(jì)側(cè)面證實(shí)了對(duì)圓極化波的不敏感性。進(jìn)一步探討所提出的雙頻選擇結(jié)構(gòu)的兩方面應(yīng)用,一個(gè)是利用其互補(bǔ)形式的電阻型FSS用于展寬吸波體帶寬的分析,在FSS穩(wěn)定的雙頻透波的基礎(chǔ)上,所設(shè)計(jì)的吸波體比利用傳統(tǒng)結(jié)構(gòu)研究的更薄,總厚度小于3.6毫米,展寬了傳統(tǒng)結(jié)構(gòu)吸收體帶寬。最后設(shè)計(jì)新型頻率選擇天線罩并使用在雷達(dá)散射截面(RCS)縮減領(lǐng)域。FSS天線罩既保證了天線穩(wěn)定的工作環(huán)境免受外部干擾又能夠降低一定范圍內(nèi)帶外RCS,建立理想的天線和天線罩整系統(tǒng)模型,通過偶極子天線確定曲面天線罩的工作頻率,討論FSS天線罩對(duì)共形天線陣的參數(shù)影響。重點(diǎn)研究共形柱面天線陣在有無柱面天線罩時(shí)方向圖的比較。值得指出FSS天線罩使天線陣性能改變微小,同時(shí)帶外RCS在特定方向縮減效果可達(dá)10d B之多。以上研究表明基于此新型結(jié)構(gòu)的FSS具有優(yōu)良的電磁特性,易于應(yīng)用到設(shè)計(jì)吸波體和FSS天線罩中。
[Abstract]:Because of its unique performance and application in the field of military and aviation, frequency selective surface has gradually become a focus of research for researchers since 2000. Frequency selective surface (FSS) is similar to a spatial microwave filter, showing the characteristics of reflection and transmission in a certain bandwidth corresponding to the resonant frequency of the periodic unit size to form a filter. The effect of designing multi band, based on stereoscopic structure and miniaturized FSS is the research trend of experts at home and abroad in recent years. Firstly, it summarizes the effective calculation methods commonly used for frequency selective surfaces. The equivalent circuit method is used to analyze the frequency selection surface of typical structural shapes, and the equivalent circuit model is obtained and calculated theoretically. The relationship between the parameters of the structural unit and the selection of the surface characteristics of the frequency is obtained. The MATLAB calculation is compared with the results of the full wave numerical calculation. Secondly, a double frequency stable structural unit based on the cross loading and the square ring is proposed, and the FSS electrical characteristics are studied, including the transmission response curve of the plane wave, which is analyzed to change the incidence of the incident. The results of angular curve change, etc., show that the incident angle stability is consistent with the results of analysis and experimental test, which shows good selectivity and oblique incidence stability at? 60? FSS. The insensitivity to circular polarization is confirmed by the integration of FSS radome and circular polarized antenna. The proposed dual frequency selection structure is further explored. Two applications, one is to use its complementary form of resistance type FSS to broaden the bandwidth of the absorber. On the basis of FSS stable double frequency wave, the designed absorber is thinner than the traditional structure, and the total thickness is less than 3.6 millimeters, broadening the bandwidth of the traditional structure absorption body. Finally, a new type of frequency selection radome is designed. The.FSS radome in the field of radar cross section (RCS) reduction is used to ensure that the working environment of the antenna is stable from external interference and can reduce the outer RCS in a certain range. The ideal antenna and radome system model is established. The working frequency of the surface radome is determined by the dipole antenna, and the conformal antenna of the FSS radome is discussed. It is worth to point out that the FSS radome makes the antenna array performance small and that the effect of RCS in the specific direction can be reduced to 10d B at the same time. The above research shows that the FSS based on this new structure has excellent electromagnetic characteristics and is easy to apply. To design the absorber and the FSS radome.

【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN820.81

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