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研究生:程旭煬
研究生(外文):Hsu-yang Cheng
論文名稱:應用於LTE / WWAM 之縮小化天線設計
論文名稱(外文):A Compact Antenna for LTE/WWAN Applications
指導教授:李世明李世明引用關係湯譯增湯譯增引用關係
學位類別:碩士
校院名稱:國立臺南大學
系所名稱:電機工程學系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:47
中文關鍵詞:天線阻抗匹配多頻帶
外文關鍵詞:PIFAWWANLTEAntenna
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多頻通訊系統蓬勃發展造就雲端運算的崛起,而兼具輕、薄、短、小、多頻帶特性的天線,在無線行動通訊中,則是扮演著重要的角色。如何能在有限尺寸下,創造出多頻段而具精巧的天線將成為重大的挑戰。
本篇論文第四章提出以單點短路引線產生電感性阻抗,進而匹配
PIFA 結構所增加的電容性容抗,以提升饋入的效果。並以外加晶片電感的方式,在高頻頻段產生高感抗值造成開路阻斷效果;而於延伸路徑上,因晶片電感的低通濾波效果,可於低頻區增加一操作頻帶;如此設計可有效整合於改良的 PIFA 天線架構中,且單一饋電點可於各據點頻率得到良好的頻寬。
天線主體結構38 × 22 × 5.8 mm3,接地面積43 × 22 mm3,其具有低姿態、低頻為短共振路徑且高頻為寬頻帶、可搭配數位相機雙鏡頭模組等優點。藉由增加電流共振路徑,可擴展涵蓋LTE 三個操作頻帶:LTE700(704~787MHz)/ LTE2300 (2300~2400MHz)/LTE2500 (2500~2690MHz);及無線廣域網路WWAN 的五個頻帶 GSM850 (824~894Hz)/ GSM900(880~960MHz)/ GSM1800(1710~1880MHz)/ GSM1900 (1850~1990MHz)/UMTS(1920~2170MHz);本天線可滿足上列八個頻帶所需的操作頻寬要求。
In this thesis, an internal mobile antenna operating in LTE700/LTE2300/LTE2500 and WWAN (GSM850/ GSM900/ GSM1800/ GSM1900/ UMTS) is presented. The proposed monopole antenna ground portion is to be grounded to the system ground plane of the device for practical applications. For the requirement of multi-band, it adds parasitic folded branches to increase resonating current paths. The size of the proposed PIFA and the ground plane are 38 mm × 22 mm × 5.8mm and 43 mm × 22 mm. Moreover, the antenna has a nearly omni-directional radiation pattern and a reasonable peak gain of 1.7dBi to 4.2dBi by the simulation results.
To attain the wide bandwidth of low frequency from 830 MHz frequency band can be effectively integrated in PIFA antenna. By embedding a chip inductor into the PIFA antenna, whose resonant mode is generated between the circuit and the monopole circuit. By using the reactance feed, the monopole antenna can be well incorporated into the antenna structure.
The proposed antenna was fabricated on a FR4 substrate, the overall size of the antenna is 75 × 22 × 5.8 mm3. The measured results of return loss and the radiation patterns of each frequency bands were presented and appeared to have good agreement with the simulation results.
目 錄
摘 要...V
Abstract...VI
誌 謝...VII
文字目錄...VIII
表目錄...IX
圖形目錄...IX
第一章 緒論...1
1.1 研究動機...1
1.2 研究目的...2
1.3 文獻導覽...2
1.4 論文大綱...4
第二章4G/LTE 系統介紹...5
2.1 通訊系統演進...5
2.2 LTE 發展介紹...6
第三章天線理論與簡介...9
3.1 概述...9
3.2 偶極天線...9
3.3 鏡像原理...15
3.4 單極天線...17
3.5 PIFA 天線演進過程...18
3.5.1 ILA 天線...18
3.5.2 IFA 天線...20
3.5.3 PIFA 天線...21
3. 6 PIFA 天線原理...21
第四章應用於LTE / WWAN 之手機天線設計...26
4.1 概述...26
4.2 多頻帶天線之設計概念...26
4.3 實驗結果與分析....30
4.3.1 電感負載型天線之多頻化設計...31
4.3.2 探討感抗值對天線的影響...34
4.3.3 探討饋入端與短路引線點對天線的影響...36
4.4 天線輻射場型圖及其增益結果...38
第五章 結論...45
參考文獻...46
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