臺灣博碩士論文加值系統

近幾年來，隨著行動通訊的快速發展以及大眾對於更高通訊品質的需求，行動通訊已經邁入了4G的時代，現今的智慧型手機在設計上需要具有多功能以及支援多樣頻段，也促使在天線設計上更需要有著多頻段操作的需求產生。本論文提出適用於LTE頻段的印刷式多頻段天線，天線型式為超寬頻(UWB)平面三角形單極天線(PTMA)改良而來，整體體積為60×100×1.6〖mm〗^3。本論文的設計首先將初始天線放大並在輻射體上方的空間放置金屬矩形網格，接著使用直交表(OA)決定網格分佈型式的方式來達到LTE多頻段的操作。雖然使用直交表(OA)的方式無法達到低頻(700-960MHz)所需的阻抗頻寬，但其提供的初始網格組合使天線能夠涵蓋LTE低頻一半的頻寬，因此後續改變原本的研究方向，藉由保留直交表所提供的初始網格組合，再採用多電流路徑的方法達到LTE低頻頻段的操作，並再對高頻段的阻抗匹配進行微調。最終設計完成的天線共包含低頻及高頻兩個頻帶，低頻頻帶頻寬為262MHz(698-960MHz)，|S11|皆低於-6dB，高頻頻帶頻寬為2590MHz(1410-4000MHz)，|S11|皆低於-10dB，天線可以涵蓋整個LTE頻帶操作，且最終天線在微波暗室的量測、室內及室外接收功率的量測、以及將天線以手握住考慮人體效映的量測結果也會呈現在此論文中。

With the rapid development of cellular communication and higher quality demands by the customers, the communication system has evolved to the fourth generation. Supporting multiple frequency bands in different regions becomes a must for the modern smart phone. In this thesis, a multiband printed antenna for Long-Term-Evolution(LTE) is presented. The proposed antenna is based on a ultra-wide band (UWB) planar triangular monopole antenna (PTMA) and have a volume of 60×100×1.6〖mm〗^3. The size of a PTMA is first enlarged to cover the target LTE multiple bands and a mesh consisting of rectangular metal patch is applied to the additional space above the radiator. The orthogonal array (OA) method is employed to decide the distribution of these grids. Although the OA method doesn’t find the mesh distribution that will cover the LTE lowest band from 700MHz to 960MHz, but it does provide a initial mesh distribution that covers half of this band. Based on the initial pattern calculated by using OA, multiple current path approachs are used to meet the requirements of the lowest LTE band. With several modifications to further improve the impedance matching at higher frequence band, the final antenna is implemented. This S11 of the final antenna matchs the requirement of the LTE bands with two return losses. The bandwidth of the lower band is 262MHz(698-960MHz) with 6dB return loss and that of the higher band is 2590MHz(1410-4000MHz) with 10dB return loss. The measurements of the antenna in chamber, indoor, outdoor, and handled by hands are also presented in this study.

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 序論 1
1.1 研究動機與目的 1
1.2 章節概述 3
第二章 文獻探討 4
2.1 多頻段LTE手機天線 4
2.2 印刷式平面三角形單極天線 8
2.3 直交表 11
第三章 應用直交表於印刷式平面三角形單極天線設計 13
3.1 天線初始設計 13
3.1.1 初始PTMA 13
3.1.2 等比例放大不同倍率PTMA 14
3.1.3 加長基板設計 15
3.2 使用OA改善天線輸入阻抗 17
3.2.1 二進位空槽網格規劃及OA程式實現 17
3.2.2 Type I天線模擬 19
3.2.3 Type II天線模擬 23
3.3 最終天線設計 27
3.1.1 Type III天線 27
3.3.2 增加Band A頻寬 30
3.3.3 增加Band B頻寬 32
3.3.4 最終天線結構 36
3.4 結論. 41
第四章 天線實作與量測驗證 42
4.1 反射損耗量測 42
4.2 輻射場型、最大增益及輻射效率量測 45
4.3 天線於實際環境中接收功率量測 55
第五章 結論 68
參考文獻 73

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