本文選題：超材料吸波體　切入點(diǎn)：磁性吸波涂料　出處：《南京郵電大學(xué)》2017年碩士論文

【摘要】：電磁超材料作為新興的科研領(lǐng)域,對(duì)于超材料的研究已經(jīng)廣泛滲透在物理學(xué)、化學(xué)、電磁學(xué)、材料學(xué)、工程學(xué)等領(lǐng)域。本文基于電磁超材料且將周期性的吸波結(jié)構(gòu)作為研究對(duì)象,旨在設(shè)計(jì)出在低頻(1-8GHz)頻段上具有超薄寬頻的吸波結(jié)構(gòu)。區(qū)別于傳統(tǒng)的三層吸波結(jié)構(gòu)(金屬電諧振、介質(zhì)材料、金屬背板)所具有的結(jié)構(gòu)厚度大、吸波帶寬窄且頻率不易調(diào)節(jié)等缺點(diǎn)。本文設(shè)計(jì)的吸波結(jié)構(gòu)都結(jié)合了磁性吸波涂層進(jìn)行了復(fù)合結(jié)構(gòu)的設(shè)計(jì),不僅改進(jìn)了傳統(tǒng)吸波結(jié)構(gòu)的缺點(diǎn)并仍具有寬角度、極化不敏感等特性。本文主要研究?jī)?nèi)容如下:(1)采用在傳統(tǒng)的三層吸波結(jié)構(gòu)上增加了一層磁性吸波涂層并結(jié)合金屬圓環(huán)的諧振結(jié)構(gòu)設(shè)計(jì)了一種四層結(jié)構(gòu)的超薄低頻復(fù)合吸波結(jié)構(gòu)。該結(jié)構(gòu)能達(dá)到2.98GHz—3.90GHz頻段上具有大于90%的吸收率,吸波結(jié)構(gòu)總厚度約為中心波長(zhǎng)的1/24,周期尺寸約為中心波長(zhǎng)的1/8.5。(2)通過(guò)對(duì)上述的超薄低頻復(fù)合吸波結(jié)構(gòu)進(jìn)行介質(zhì)材料的改變和結(jié)構(gòu)參數(shù)的優(yōu)化,設(shè)計(jì)出一種具有低頻超寬帶的復(fù)合吸波結(jié)構(gòu)。此結(jié)構(gòu)能達(dá)到在2.17GHz—6.86GHz頻段上都具有大于90%的吸收率,90%吸收率處的相對(duì)帶寬高達(dá)104%。吸波結(jié)構(gòu)總厚度約為中心波長(zhǎng)的1/15,且同時(shí)保留了極化不敏感和角度入射等優(yōu)異特性。(3)創(chuàng)新性地利用磁性吸波涂層進(jìn)行了多層多圓環(huán)型吸波體設(shè)計(jì),提出了一種超薄超寬帶的吸波體。該吸波體旨在針對(duì)上述兩種吸波結(jié)構(gòu)達(dá)到厚度和帶寬的均衡,且其多圓環(huán)結(jié)構(gòu)嵌入在介質(zhì)基板中。該結(jié)構(gòu)能在2.96GHz—5.33GHz頻段上具有大于90%的吸收率,90%吸收率處的相對(duì)帶寬為57.17%,吸波結(jié)構(gòu)總厚度約為中心波長(zhǎng)的1/18。
[Abstract]:As a new field of scientific research, electromagnetic metamaterials have been widely permeated in physics, chemistry, electromagnetism and materials. Engineering and other fields. Based on electromagnetic supermaterial and taking periodic absorbing structure as the object of study, the purpose of this paper is to design an ultra-thin broadband absorbing structure in the low frequency band (1-8 GHz), which is different from the traditional three-layer absorbing structure (metal electroresonance). The dielectric material, metal backplane) has the disadvantages of large structure thickness, narrow absorbing band and difficult to adjust the frequency. The absorbing structure designed in this paper is combined with the magnetic absorbing coating to design the composite structure. It not only improves the shortcoming of traditional absorbing structure, but also has wide angle. The main contents of this paper are as follows: (1) A magnetic absorbing coating is added to the traditional three-layer absorbing structure and a four-layer structure is designed for ultra-thin low frequency combining with the resonant structure of a metal ring. The structure can achieve the absorptivity of more than 90% in the 2.98GHz-3.90GHz band. The total thickness of the absorbing structure is about 1 / 24 of the central wavelength, and the periodic size is about 1 / 8.5.2 of the central wavelength. A composite absorbing structure with low frequency ultra-wideband (UWB) is designed. The structure can reach the relative bandwidth of 10 4 at 90% absorptivity over 90% in 2.17GHz-6.86GHz band. The total thickness of absorbing structure is about 1 / 15 of the central wavelength. At the same time, the excellent characteristics of polarization insensitivity and angle incidence are retained. A kind of ultra-thin ultra-wideband absorber is proposed. The aim of the absorber is to equalize the thickness and bandwidth of the two kinds of absorbing structures. The multi-ring structure is embedded in the dielectric substrate. The relative bandwidth at 90% absorptivity of the 2.96GHz-5.33GHz band is 57.170.The total thickness of the structure is about 1 / 18 of the central wavelength.
【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】：2017
【分類號(hào)】：TB33

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