【摘要】：在通信領(lǐng)域中,基于寬頻帶技術(shù)存在的擴(kuò)頻技術(shù)日益突顯出其重要性;而天線作為無線通信系統(tǒng)的重要組成部分,因此需要其具備更寬的頻帶,同時又具有更小的尺寸。安裝天線的工作平臺一般比較狹窄,空間十分有限,并且通常會同時放置多個天線,天線之間的電磁干擾將會影響通信質(zhì)量,利用寬帶天線替代多副天線可以解決此問題。此外,隨著無線通信技術(shù)的日新月異以及大規(guī)模集成電路的飛速發(fā)展,各種電子設(shè)備都日趨小型化。天線作為通信系統(tǒng)前端的關(guān)鍵部件,其小型化問題已經(jīng)阻礙到無線通信系統(tǒng)的發(fā)展。因此,為了不影響現(xiàn)代通信系統(tǒng)的快速發(fā)展,性能優(yōu)良的低頻天線的寬帶及小型化研究已得到廣泛重視,它不僅具有重要的理論意義,更具有工程實現(xiàn)的必要性。本論文在對目前的超短波(VHF:30-300MHz)、分米波(UHF:300-3000MHz)天線的寬帶及小型化技術(shù)進(jìn)行了介紹和總結(jié)的基礎(chǔ)上,研究并設(shè)計了具有寬頻帶的低頻天線和小型化的低頻天線,所做的主要工作可以概括為:第一章緒論,論證了本文的選題背景及研究意義;簡要回顧了近年來國內(nèi)外關(guān)于低頻天線的寬帶化、小型化研究的發(fā)展歷程;此外,還介紹了低頻電小天線的基本理論。第二章介紹了衡量天線性能的主要技術(shù)指標(biāo);并對目前常用的寬帶技術(shù)和小型化技術(shù)、分析方法及優(yōu)化算法進(jìn)行簡單的概括和介紹。第三章基于雙錐天線設(shè)計了改進(jìn)的雙層地板單錐天線,詳盡論述了該天線的設(shè)計思想,仿真分析了該天線尺寸參數(shù)對其性能的影響。為了實現(xiàn)指標(biāo)要求,引入了天線外部寬帶匹配網(wǎng)絡(luò),并采用CST軟件自帶的遺傳算法成功設(shè)計了寬帶匹配網(wǎng)絡(luò)。最后,對天線以及寬帶匹配網(wǎng)絡(luò)進(jìn)行了加工和測試,并與傳統(tǒng)單錐天線進(jìn)行了比較。第四章根據(jù)第三章對錐天線的研究,結(jié)合電小天線的阻抗特性,對單錐天線進(jìn)行一系列的結(jié)構(gòu)改進(jìn)。通過在錐體末端水平展開以及弧形頂部加載的方法實現(xiàn)了低頻天線的寬帶小型化。第五章總結(jié)本文工作,對低頻天線的寬帶及小型化發(fā)展趨勢進(jìn)行了展望,提出后續(xù)工作的改進(jìn)方向。
[Abstract]:In the field of communication, the spread spectrum technology based on broadband technology has increasingly highlighted its importance, and antenna, as an important part of wireless communication system, needs to have a wider frequency band and a smaller size at the same time. The working platform for installing antenna is generally narrow, the space is very limited, and multiple antennas are usually placed at the same time. The electromagnetic interference between antennas will affect the communication quality. This problem can be solved by using broadband antenna instead of multiple antennas. In addition, with the rapid development of wireless communication technology and large-scale integrated circuits, all kinds of electronic equipment are becoming miniaturized day by day. As the key component of the front end of communication system, the miniaturization of antenna has hindered the development of wireless communication system. Therefore, in order not to affect the rapid development of modern communication system, the research on broadband and miniaturization of low frequency antenna with excellent performance has been paid more and more attention. it not only has important theoretical significance, but also has the necessity of engineering realization. In this paper, the broadband and miniaturization technologies of ultra-short wave (VHF:30-300MHz) and decimeter wave (UHF:300-3000MHz) antennas are introduced and summarized. The low frequency antenna with wide band and miniaturized low frequency antenna are studied and designed. The main work can be summarized as follows: the first chapter is the introduction, which demonstrates the background and significance of this paper. In this paper, the development of broadband and miniaturization of low frequency antennas at home and abroad in recent years is briefly reviewed, and the basic theory of low frequency electric small antennas is also introduced. In the second chapter, the main technical indexes to measure the antenna performance are introduced, and the commonly used broadband technology and miniaturization technology, analysis methods and optimization algorithms are briefly summarized and introduced. In the third chapter, an improved double-layer floor single-cone antenna is designed based on the double-cone antenna, the design idea of the antenna is discussed in detail, and the influence of the antenna size parameters on its performance is simulated and analyzed. In order to meet the requirements of the index, the broadband matching network outside the antenna is introduced, and the broadband matching network is successfully designed by using the genetic algorithm with CST software. Finally, the antenna and broadband matching network are machined and tested, and compared with the traditional single cone antenna. In chapter 4, according to the research of conical antenna in chapter 3, a series of structural improvements of single cone antenna are carried out according to the impedance characteristics of electric small antenna. The broadband miniaturization of low frequency antenna is realized by horizontal expansion at the end of cone and loading at the top of arc. In the fifth chapter, the work of this paper is summarized, the development trend of broadband and miniaturization of low frequency antenna is prospected, and the improvement direction of follow-up work is put forward.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN820

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 樊文生;;地-電離層腔體中極低頻天線輻射場的數(shù)值計算[J];艦船電子工程;2010年07期

相關(guān)碩士學(xué)位論文 前1條

1 但冬梅;低頻天線的寬帶及小型化研究[D];電子科技大學(xué);2014年

，

本文編號：2481887