【摘要】：本文分析總結(jié)了基于頻率選擇表面的單波段及雙波段結(jié)構(gòu)單元的吸波結(jié)構(gòu),在此基礎(chǔ)上設(shè)計(jì)出了單層寬頻帶超材料吸波結(jié)構(gòu)。通過(guò)三維電磁仿真軟件CST對(duì)其進(jìn)行建模仿真,結(jié)果表明相較于基于經(jīng)典FSS結(jié)構(gòu)單元的超材料吸波結(jié)構(gòu)其-5d B帶寬能擴(kuò)展到100%以上同時(shí)介質(zhì)層的厚度遠(yuǎn)小于工作波長(zhǎng)的四分之一。同時(shí)根據(jù)等效電路理論對(duì)結(jié)果進(jìn)行了驗(yàn)證。本文的主要內(nèi)容是:(1)闡述了經(jīng)典的Salisbury屏、Jaumann屏、頻率選擇表面、超材料吸波體的基本概念和理論,以及它們的一些基本特性。(2)設(shè)計(jì)了基于頻率選擇表面超材料吸波體的基本單元結(jié)構(gòu),同時(shí)討論了結(jié)構(gòu)的尺寸、介質(zhì)層、入射波的極化方式、入射波的入射角度、電路屏的材料等因素對(duì)吸收效率的影響。(3)設(shè)計(jì)出基于頻率選擇表面組合結(jié)構(gòu)的雙頻點(diǎn)超材料吸波結(jié)構(gòu),組合結(jié)構(gòu)的兩個(gè)對(duì)應(yīng)主諧振點(diǎn)分別為1.5THz和3THz。同時(shí)探討了結(jié)構(gòu)的尺寸及間距對(duì)吸收系數(shù)的影響,結(jié)果表明組合結(jié)構(gòu)具有吸收效率高、角度和極化穩(wěn)定性好。(4)提出了基于FSS太赫茲波段單層寬頻帶吸波結(jié)構(gòu),相較于傳統(tǒng)結(jié)構(gòu)其-5d B帶寬可提高100%以上,而結(jié)構(gòu)的厚度能降低一半。在矩形貼片的基礎(chǔ)上,通過(guò)開(kāi)槽處理得到E形結(jié)構(gòu)。相比于矩形貼片吸收帶寬有顯著提高。
[Abstract]:In this paper, the absorbing structures of single-band and dual-band structure elements based on frequency-selective surface are analyzed and summarized, and a single-layer broadband supermaterial absorbing structure is designed. The 3D electromagnetic simulation software CST is used to model and simulate it. The results show that compared with the metamaterial absorbing structure based on classical FSS structure, the -5dB bandwidth can be extended to more than 100% and the thickness of the dielectric layer is much less than 1/4 of the operating wavelength. At the same time, the results are verified according to the equivalent circuit theory. The main contents of this paper are as follows: (1) the basic concepts and theories of classical Salisbury screen, Jaumann screen, frequency selective surface, metamaterial absorber are expounded. And some of their basic characteristics. (2) the basic element structure based on the frequency selective surface supermaterial absorber is designed, and the size of the structure, the dielectric layer, the polarization mode of the incident wave, the incident angle of the incident wave are discussed. The influence of material of circuit screen on absorption efficiency. (3) double frequency point supermaterial absorbing structure based on frequency selective surface composite structure is designed. The two corresponding main resonance points of the combined structure are 1.5THz and 3THZ respectively. At the same time, the influence of the size and spacing of the structure on the absorption coefficient is discussed. The results show that the combined structure has high absorption efficiency, good angle and polarization stability. (4) the single-layer broadband absorbing structure based on FSS terahertz band is proposed. Compared with the traditional structure, the bandwidth of -5 dB can be increased by more than 100%, and the thickness of the structure can be reduced by half. Based on the rectangular patch, the E-shaped structure is obtained by slotted processing. Compared with rectangular patch, the absorption bandwidth is significantly improved.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB39

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