【摘要】：天線作為通信、雷達(dá)系統(tǒng)中的關(guān)鍵部件,逐漸受到更多人的關(guān)注,同時(shí)人們也對(duì)其提出了更多的要求。為了簡(jiǎn)化天線系統(tǒng)、降低系統(tǒng)成本,可重構(gòu)天線成為較好的選擇。本文以人工電磁表面為基礎(chǔ)對(duì)方向圖可重構(gòu)天線展開(kāi)研究,主要內(nèi)容包括以下幾個(gè)方面:首先,本文介紹了人工電磁超表面的近幾年研究現(xiàn)狀及發(fā)展趨勢(shì),并簡(jiǎn)單介紹了人工電磁超表面及石墨烯材料的特有電磁特性。通過(guò)計(jì)算周期單元結(jié)構(gòu)的等效阻抗,利用微波網(wǎng)絡(luò)模型對(duì)人工電磁超表面的反射系數(shù)做了解析分析,并利用HFSS及CST軟件對(duì)其進(jìn)行了數(shù)值仿真分析。其次,基于FP諧振腔天線可重構(gòu)原理,利用石墨烯材料設(shè)計(jì)了反射系數(shù)可調(diào)的部分反射表面和高阻抗表面,并據(jù)此構(gòu)成FP諧振腔天線,通過(guò)改變石墨烯的偏置電壓實(shí)現(xiàn)了天線方向圖在±75°范圍內(nèi)的可重構(gòu),且天線最大方向圖均超過(guò)5dBi,具有良好的輻射特性。然后,本文設(shè)計(jì)了一種工作于太赫茲頻段的金屬石墨烯混合組成的高阻抗表面,在其上方添加簡(jiǎn)單饋源天線,可實(shí)現(xiàn)天線方向圖的可重構(gòu)。石墨烯和電極之間加載不同的偏置電壓,可導(dǎo)致高阻抗表面反射系數(shù)的不同,并最終改變整體天線的輻射方向。該天線工作于1.03THz,利用全波仿真軟件CST對(duì)其進(jìn)行仿真,其方向圖可重構(gòu)范圍可達(dá)±75°。最后,本文提出了一種基于金屬與石墨烯復(fù)合材料的方向圖可重構(gòu)微帶準(zhǔn)八木天線。在二氧化硅基板上表面印制左右對(duì)稱的八木貼片天線單元,利用石墨烯材料將金屬引向單元補(bǔ)償至反向器長(zhǎng)度,并在介質(zhì)基板下表面間隔印制金屬與石墨烯條帶。通過(guò)聯(lián)合控制上下表面的石墨烯偏置電壓實(shí)現(xiàn)天線H面方向圖在-70°至70°之間掃描。本文最后對(duì)全文進(jìn)行了總結(jié),并對(duì)下一步如何利用人工電磁超表面做了簡(jiǎn)單展望。
[Abstract]:As a key component of communication, antenna in radar system has attracted more and more attention. At the same time, people have put forward more requirements for it. In order to simplify the antenna system and reduce the cost of the system, reconfigurable antenna becomes a better choice. Firstly, the research status and development trend of artificial electromagnetic Supersurface in recent years are introduced, and the unique electromagnetic properties of artificial electromagnetic Supersurface and graphene materials are briefly introduced. Secondly, based on the reconfigurable principle of FP resonator antenna, the partial reflective surface and high impedance surface with adjustable reflective coefficient are designed by using graphene material, and then the FP resonator antenna is constructed. The antenna pattern is realized by changing the bias voltage of graphene. The antenna is reconfigurable in the range of The antenna operates at 1.03 THz and is simulated by full-wave simulation software CST. The reconfigurable range of the antenna pattern can reach (+) 75 degrees. Finally, a direction based on metal-graphene composites is proposed. Fig. 1 Reconfigurable microstrip quasi-Yagi antenna. Left-right symmetrical Yagi patch antenna elements are printed on the surface of silicon dioxide substrate. The metal lead element is compensated to the length of the reverser using graphene material. Metal and graphene strips are printed separately on the surface below the dielectric substrate. The graphene bias voltage on the upper and lower surfaces is controlled jointly. The H-plane pattern of the antenna is now scanned from - 70 to 70 degrees. Finally, the full text is summarized and a brief prospect of how to utilize the artificial electromagnetic Supersurface is given.
【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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本文編號(hào)：2208324