本文選題：電磁超材料 + 超寬帶吸波��； 參考：《西南大學(xué)》2017年碩士論文

【摘要】：電磁超材料是一種人工復(fù)合結(jié)構(gòu),由于其反常的電磁特性受到了國內(nèi)外學(xué)者的廣泛關(guān)注�；诔牧系奈ㄅc傳統(tǒng)的吸波材料相比具有質(zhì)量輕、厚度薄、吸收率高等優(yōu)點(diǎn),被廣泛應(yīng)用于隱身技術(shù)、無損探測、太赫茲成像、天線等領(lǐng)域。本論文以拓寬吸波帶寬為目標(biāo),主要開展了如下工作:(1)在微波段,通過在一個周期內(nèi)放置四個不同尺寸的金字塔形單元,提出了梯度分布的金字塔形吸波結(jié)構(gòu)。研究結(jié)果表明,對于9層結(jié)構(gòu)(總厚度為4.122 mm),在8~14 GHz吸收率達(dá)到90%以上;對于13層結(jié)構(gòu)(總厚度為4.134 mm),在7~21.5GHz吸收率達(dá)到90%以上。該結(jié)構(gòu)對TE和TM極化都有效,且在較大的入射角度范圍內(nèi)吸收率都保持了高吸收率。進(jìn)一步分析發(fā)現(xiàn),尺寸較大的諧振單元的高階模對寬頻吸收有很大的貢獻(xiàn),與以往只考慮基模的吸波機(jī)理有所不同。(2)在紅外波段,通過把四個不同尺寸的五邊形諧振單元嵌入到一個周期內(nèi),提出了新型的超寬帶吸波結(jié)構(gòu)。單層結(jié)構(gòu)在7.8~12.1μm對TE和TM極化吸收率均達(dá)到90%以上;雙層結(jié)構(gòu)在5.17~13.73μm對TE和TM極化吸收率均達(dá)到90%以上。通過研究金屬層的電流和磁場分布,發(fā)現(xiàn)在諧振頻點(diǎn)處電諧振和磁諧振同時(shí)存在,并且諧振波長跟表層金屬的尺寸成正比關(guān)系。微波段的吸波在雷達(dá)隱身方面有重要的應(yīng)用,而紅外波段的吸波在輻射冷卻方面有重要的應(yīng)用。因此,本文工作在這兩方面都有重要的實(shí)用價(jià)值。
[Abstract]:Electromagnetic supermaterial is a kind of artificial composite structure. Compared with traditional absorbing materials, the microwave absorbing materials based on metamaterials have the advantages of light weight, thin thickness and high absorptivity. They are widely used in stealth technology, nondestructive detection, terahertz imaging, antenna and other fields. The main work of this thesis is as follows: (1) in the microwave section, four pyramidal units with different sizes are placed in a period, and the gradient distribution pyramid absorbing structure is proposed. The results show that for 9 layers (the total thickness is 4.122 mm), the absorptivity is more than 90% at 814 GHz), for 13 layers (the total thickness is 4.134 mm), the absorptivity is more than 90% at 721.5 GHz). The structure is effective for both te and TM polarization, and the absorptivity remains high in the range of larger incidence angle. Further analysis shows that the higher-order modes of the larger resonant elements have a great contribution to the broadband absorption, which is different from the previous absorption mechanism which only considers the fundamental modes. (2) in the infrared band, A novel ultra-wideband (UWB) absorbing structure is proposed by embedding four pentagonal resonant elements of different sizes into one period. The polarization absorptivity of te and TM in monolayer structure is above 90% for te and TM, and that for double layer structure is above 90% for te and TM at 5.170.73 渭 m. By studying the distribution of current and magnetic field in the metal layer, it is found that both the electric resonance and the magnetic resonance exist at the resonance frequency point, and the resonant wavelength is proportional to the size of the surface metal. Microwave absorption plays an important role in radar stealth, while infrared wave absorption has important applications in radiation cooling. Therefore, the work of this paper has important practical value in these two aspects.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB34

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本文編號：2100151