本文選題：超介質(zhì) + 天線　； 參考：《華中師范大學(xué)》2016年碩士論文

【摘要】：超介質(zhì)是一種人工電磁材料,具有與自然物質(zhì)不同的電磁特性。設(shè)計(jì)實(shí)現(xiàn)任意介電常數(shù)、磁導(dǎo)率和折射率的超介質(zhì)使得超介質(zhì)在微波領(lǐng)域的應(yīng)用提供了可能,特別是超介質(zhì)加載到天線上的問題得到廣泛關(guān)注,研究具有重要的應(yīng)用價值。本文據(jù)超介質(zhì)理論和天線相關(guān)理論設(shè)計(jì)了兩種加載超介質(zhì)天線,并且所設(shè)計(jì)的天線能夠應(yīng)用于探地雷達(dá)系統(tǒng)。針對探地雷達(dá)常用的碟形天線具有超寬帶,但是方向性不好,增益有限的問題,本文提出了一種金屬背腔加載到天線的背面,從而實(shí)現(xiàn)天線的單向輻射。盡管金屬背腔的加載解決了蝶形天線的輻射單向性,但是天線的方向性有待改進(jìn),天線的半功率波瓣寬度太大使得能量輻射不集中。為此,提出了一種加載零折射率超介質(zhì)的天線,使得天線的增益提高了1.725 dB。根據(jù)傳統(tǒng)的Vivaldi天線具備超寬的特性,本文設(shè)計(jì)了一種零指數(shù)超介質(zhì),并將其嵌入到Vivaldi天線的開口處使得天線的整體結(jié)構(gòu)緊湊而且體積小。與原始Vivaldi天線相比,加載超介質(zhì)的Vivaldi天線的增益增加了0.9dB-2.48 dB,而且半功率波瓣寬度減小了10度。本文的主要創(chuàng)新點(diǎn)是：設(shè)計(jì)了具有特定性質(zhì)的超介質(zhì),并將其加載到天線上,提高天線的方向性和增益,實(shí)現(xiàn)了超介質(zhì)在天線上的應(yīng)用潛力。
[Abstract]:Supermedia is a kind of artificial electromagnetic material, which has different electromagnetic properties from natural matter. The design and realization of supermedia with arbitrary permittivity, permeability and refractive index make it possible for supermedia to be applied in microwave field. Especially, the problem of supermedia loading into antenna has been paid more and more attention, and the research has important application value. In this paper, two kinds of loaded supermedia antennas are designed according to the theory of hypermedia and the theory of antenna correlation, and the designed antennas can be applied to ground penetrating radar system. Aiming at the problem that the dish antenna commonly used in ground penetrating radar has ultra-wideband (UWB), but the directivity is not good and the gain is limited, this paper presents a kind of metal back cavity loading on the back of the antenna to realize the unidirectional radiation of the antenna. Although the loading of the metal back cavity solves the radiation unidirectionality of the butterfly antenna, the directivity of the antenna needs to be improved, and the width of the half-power lobe of the antenna is too large to make the energy radiation not concentrated. Therefore, an antenna loaded with zero refractive index supermedia is proposed, which can increase the antenna gain by 1.725 dB. According to the characteristic that the traditional Vivaldi antenna is super wide, a zero exponent supermedium is designed and embedded into the opening of the Vivaldi antenna to make the whole structure of the antenna compact and small. Compared with the original Vivaldi antenna, the gain of the loaded Vivaldi antenna increases the 0.9dB-2.48 DB, and the width of the half-power lobe decreases by 10 degrees. The main innovation of this paper is to design the supermedia with special properties and load it into the antenna to improve the directivity and gain of the antenna and realize the application potential of the supermedia on the antenna.
【學(xué)位授予單位】：華中師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN957.2

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1 吳松;加載超介質(zhì)的高增益、高方向性探地雷達(dá)天線研究[D];華中師范大學(xué);2016年

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本文編號：1825482