本文選題：特征模理論　切入點(diǎn)：超寬帶天線　出處：《電子科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：特征模理論近年來在天線設(shè)計(jì)領(lǐng)域受到了廣泛關(guān)注,它可以對天線的主要特性加以物理意義上的解釋,也能高精度地求解邊界復(fù)雜的電磁問題。它以物體的本征模作為展開函數(shù)處理待求問題,可以描述任意形狀物體的輻射機(jī)理。隨著人們對通信速率和質(zhì)量的要求越來越高,如何提高無線通信系統(tǒng)的信道容量和通信質(zhì)量成為了無線通信技術(shù)研究的一個(gè)重要領(lǐng)域。超寬帶(Ultra Wide Band,UWB)通信技術(shù)具有能充分利用頻譜資源、保密性能好、傳輸效率高等優(yōu)點(diǎn),但是功率譜密度低。而采用多輸入多輸出(Multi-Input Multi-Output,MIMO)技術(shù)可以提高頻譜效率、增大覆蓋范圍、降低功耗、提高鏈路可靠性高等。將二者結(jié)合的UWB MIMO技術(shù)可以有效增加UWB通信系統(tǒng)的信道容量和工作范圍,在無線通信系統(tǒng)中有廣闊的應(yīng)用前景。本文主要研究利用特征模理論對UWB MIMO天線進(jìn)行分析和設(shè)計(jì)。下面簡要介紹本文的主要內(nèi)容。第一章主要介紹研究背景和所做工作的意義。介紹了國內(nèi)外特征模理論及其在天線設(shè)計(jì)方面的研究情況,以及MIMO天線常見的幾種去耦合的方法。第二章介紹經(jīng)典特征模的物理意義和利用特征模研究任意形狀物體時(shí)涉及到的特征值、特征電流等主要參數(shù),揭示了用特征模指導(dǎo)天線設(shè)計(jì)的理論依據(jù),為后續(xù)的天線研究做鋪墊。此外,還簡單介紹了MIMO通信技術(shù)。第三章首先介紹了寬頻段內(nèi)的特征模式排列方法,并利用特征模理論分析了超寬帶天線單元和兩單元多天線。通過引入隔離結(jié)構(gòu),使UWB MIMO天線的兩種主要特征模式在同一頻段諧振,且不同端口的特征電流反相,從而使天線在超寬頻帶具有了較高的隔離度。第四章基于特征模理論設(shè)計(jì)了兩種尺寸較小的UWB MIMO天線。通過仿真研究了天線的方向圖、輻射效率和包絡(luò)相關(guān)系數(shù)等,并加工天線驗(yàn)證了天線的部分性能。結(jié)果表明,這兩種天線性能良好,可以應(yīng)用在UWB MIMO通信系統(tǒng)中。最后對全文工作進(jìn)行總結(jié),并對下一步研究進(jìn)行了展望。
[Abstract]:In recent years, the characteristic mode theory has been paid more and more attention in the field of antenna design, and it can explain the main characteristics of antenna in the physical sense. It can also be used to solve complex electromagnetic problems with high accuracy. It uses the eigenmode of an object as an expansion function to deal with the problem to be solved, and can describe the radiation mechanism of an object with arbitrary shape. With the increasing demand for the communication rate and quality, the radiation mechanism of an object with arbitrary shape can be described. How to improve the channel capacity and communication quality of wireless communication system has become an important research field of wireless communication technology. Ultra-wideband (Ultra Wide) communication technology has the advantages of making full use of spectrum resources, good security performance, high transmission efficiency and so on. But the power spectrum density is low, and the multi-input multi-output multi-output MIMO-technology can improve the spectrum efficiency, increase the coverage and reduce the power consumption. The combination of UWB MIMO technology and link reliability can effectively increase the channel capacity and working range of UWB communication system. It has a broad application prospect in wireless communication system. This paper mainly studies the analysis and design of UWB MIMO antenna by using characteristic mode theory. The main contents of this paper are briefly introduced. Chapter 1 mainly introduces the research background and the. This paper introduces the characteristic mode theory at home and abroad and its research situation in antenna design. In the second chapter, the physical meaning of the classical eigenmodes and the main parameters involved in the study of arbitrary shape objects by using the eigenmodes, such as eigenvalues, characteristic currents, and so on, are introduced. This paper reveals the theoretical basis of antenna design guided by characteristic mode, and lays the groundwork for further antenna research. In addition, the MIMO communication technology is briefly introduced. In chapter 3, the method of feature pattern arrangement in broadband band is first introduced. The UWB antenna element and the two-element multi-antenna are analyzed by the eigenmode theory. By introducing the isolation structure, the two main characteristic modes of the UWB MIMO antenna are resonant in the same frequency band, and the characteristic current of different ports is inversed. In chapter 4th, two kinds of smaller UWB MIMO antennas are designed based on eigenmode theory. The pattern of antenna, radiation efficiency and envelope correlation coefficient are studied by simulation. The results show that the two antennas have good performance and can be used in UWB MIMO communication system. Finally, the work of this paper is summarized, and the future research is prospected.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN820

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