本文選題：頻率可重構(gòu)天線　切入點(diǎn)：超材料　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電子和無線通信行業(yè)的快速發(fā)展,系統(tǒng)對設(shè)備的小型化、高增益、多頻段等指標(biāo)要求越來越高。天線作為系統(tǒng)接收信號(hào)和發(fā)射信號(hào)的部分,它的小型化至關(guān)重要。頻率可重構(gòu)天線通過改變其電氣特性可完成多個(gè)天線的性能,從而減小通信系統(tǒng)的體積、提高系統(tǒng)的兼容性和降低成本。近幾年來,超材料以其負(fù)介電常數(shù)、負(fù)磁導(dǎo)率、負(fù)折射率等獨(dú)特的物理性質(zhì)受到了極大的關(guān)注。已有不少研究者提出將超材料應(yīng)用于天線中,解決一些傳統(tǒng)天線設(shè)計(jì)無法解決的難題以達(dá)到天線小型化、多頻帶的目的。本論文主要研究超材料在頻率可重構(gòu)天線中的應(yīng)用,通過改變超材料結(jié)構(gòu)單元參數(shù)來改變天線的諧振模式從而實(shí)現(xiàn)頻率的可重構(gòu),并利用超材料結(jié)構(gòu)單元的色散特性驗(yàn)證這種方法的可行性。本論文主要內(nèi)容及成果概括如下:首先,簡要介紹了頻率可重構(gòu)天線和超材料的研究背景、國內(nèi)外研究現(xiàn)狀,而后分別介紹了超材料中左手傳輸線方程、復(fù)合左/右手傳輸線方程以及零階諧振基本理論,最后簡要介紹了天線和共面波導(dǎo)的相關(guān)理論。其次,設(shè)計(jì)了一款基于ENG-TL(Epsilon-Negative Transmission Line,負(fù)介電常數(shù)傳輸線)的頻率可重構(gòu)天線,該天線由兩個(gè)ENG-TL單元構(gòu)成,分別在兩個(gè)單元與輻射貼片之間加載開關(guān),通過開關(guān)的通斷實(shí)現(xiàn)頻率的可重構(gòu)。該天線結(jié)構(gòu)簡單,性能穩(wěn)定,可在三種工作模式之間切換,工作頻率覆蓋WLAN(2.4-2.484GHz)、WiMAX(3.3-3.69GHz)和C波段衛(wèi)星通信的下行波段(3.7-4.2GHz)。最后,設(shè)計(jì)了兩款基于CRLH-TL(Composite Right/Left-Handed Transmission Line,復(fù)合左/右手傳輸線)的小型頻率可重構(gòu)天線。這兩款天線均有兩個(gè)可重構(gòu)模式,第一款為兩個(gè)單頻帶模式,第二款為一個(gè)單頻帶模式一個(gè)雙頻帶模式,可通過控制開關(guān)的通斷方便的進(jìn)行工作模式的切換。這兩個(gè)天線尺寸僅為0.082λ×0.111λ×0.004λ(其中λ對應(yīng)1.76GHz波長)。仿真和實(shí)測結(jié)果表明,天線在實(shí)現(xiàn)頻率可重構(gòu)的同時(shí)保持了穩(wěn)定的輻射方向圖,可用于WLAN(2.4-2.484GHz/5.725-5.825GHz)、WIMAX(2.5-2.69GHz)、ISM2.4GHz和UMTS(1750-1780MHz)系統(tǒng)。
[Abstract]:With the rapid development of the electronic and wireless communication industry, the system requires more and more equipment miniaturization, high gain and multi-frequency band. Antenna is the part of the system to receive and transmit signals. Its miniaturization is very important. The frequency reconfigurable antenna can accomplish the performance of multiple antennas by changing its electrical characteristics, thus reducing the volume of communication system, increasing the compatibility of the system and reducing the cost. Metamaterials have attracted great attention for their unique physical properties, such as negative permittivity, negative permeability and negative refractive index. Many researchers have proposed the application of metamaterials in antennas. In order to achieve the purpose of antenna miniaturization and multi-band, this paper mainly studies the application of metamaterials in frequency reconfigurable antenna, which can not be solved by traditional antenna design. By changing the parameters of the metamaterial structure element to change the resonant mode of the antenna, the frequency can be reconfigurable. The main contents and achievements of this paper are summarized as follows: firstly, the research background of frequency reconfigurable antenna and metamaterials is briefly introduced, and the current research situation at home and abroad is introduced. Then, the left-handed transmission line equation, the composite left-hand transmission line equation and the zero-order resonance theory in the supermaterial are introduced respectively. Finally, the related theories of antenna and coplanar waveguide are briefly introduced. A frequency reconfigurable antenna based on ENG-TL(Epsilon-Negative Transmission line (negative dielectric constant transmission line) is designed. The antenna consists of two ENG-TL elements, which load switches between the two elements and the radiation patch, respectively. The frequency can be reconfigurable by switching on and off of the switch. The antenna is simple in structure, stable in performance, and can be switched between the three operating modes. The operating frequency covers WLAN 2.4-2.484GHzn WiMAX 3.3-3.69 GHz) and the downlink band 3.7-4.2 GHz for C-band satellite communication. Finally, Two small frequency reconfigurable antennas based on CRLH-TL(Composite Right/Left-Handed Transmission line are designed. The second is a single-band mode and a dual-band mode, which can be switched easily by switching on and off of the control switch. The size of the two antennas is only 0.082 位 脳 0.111 位 脳 0.004 位 (where 位 corresponds to 1.76 GHz wavelength). The simulation and experimental results show that, The antenna can be used in WLAN 2.4-2.484GHz / 5.725-5.825GHz / s WIMAX 2.5-2.69GHz / ISM 2.4GHz and UMTS 1750-1780MHz systems.
【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】：2016
【分類號(hào)】：TN820

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本文編號(hào)：1627991