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研究生:陳泓瑞
研究生(外文):Hung-Ruei Chen
論文名稱:應用在現代行動通訊之平衡式饋入平面天線
論文名稱(外文):A Balance-fed Planar Antenna for Mobile Applications
指導教授:邱政男邱政男引用關係
指導教授(外文):Cheng-Nan Chiu
學位類別:碩士
校院名稱:大葉大學
系所名稱:電信工程學系碩士班
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:2007
畢業學年度:95
語文別:中文
論文頁數:69
中文關鍵詞:平面天線平衡式饋入天線行動通訊
外文關鍵詞:planar antennabalanced-fed antennamobile communication
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本論文提出兩個應用於現代行動通訊之平衡式饋入的平面天線:T型單極天線與三角微帶天線。此T型單極天線是由帶線結構的饋入來取得平衡式訊號,天線的結構相當微小並且擁有抵抗接地面大小變化的能力。此平衡式T型天線的設計可分為三步驟:(1)設計一個應用在IMT-2000頻帶的非平衡式T型天線;(2)設計一個應用在同ㄧ頻帶的Broadside-edge-coupled balun;(3)整合第一步驟的天線跟第二步驟的Balun,使之成為平衡式饋入天線。在此,建構出一個應用在第三代行動通訊IMT-2000頻帶的天線,並以模擬跟實際量測去探討天線的反射損耗、輻射場型,其結果證實了天線的寬頻和全向性輻射,足以涵蓋IMT-2000的頻帶,而頻帶內的最大天線增益則為2.6 dBi。三角微帶天線的設計流程跟T型天線大致相同,比較值得ㄧ提的是,平衡式三角微帶天線的頻寬更寬,總共包含了五個應用頻帶:DCS、PCS、IMT-2000、WLAN、WiMax,比以往只能涵蓋一個應用頻帶的平衡式天線,擁有更充足的頻寬。
關鍵詞:平面天線; 平衡式饋入天線; IMT-2000;行動通訊; DCS; PCS;WLAN; WiMax。
Two balance-fed printed antennas are newly proposed in this thesis for modern mobile applications: A T-monopole antenna and a triangular-monopole antenna. This T-monopole antenna is for stripline-feeding with balanced signals. The antenna is compact and has the particular merit of immunity to the influence of size variation in feed ground. The balance-fed T-monopole antenna can be designed by three steps: (1) design an unbalance-fed T-monopole antenna for the specified band; (2) design a broadside-edge-coupled balun for this band; (3) merge the antenna and the balun implemented in Steps 1 and 2 into a balance-fed antenna. A prototype of the antenna for operating at the international mobile telecommunications 2000 (IMT-2000) band has been constructed and is shown as an example. Its return loss and radiation patterns have been simulated and measured. The experimental results demonstrate the broad bandwidth and omnidirectional radiation characteristics. Its impedance-matching bandwidth, determined by -10 dB return loss, is about 670 MHz, which is large enough to cover IMT-2000 band. The maximum antenna gain is estimated at 2.6 dBi across this band. The design procedure for the triangular-monopole antenna is the same as the T-monopole antenna. It is worth mentioning that the impedance-matching bandwidth of the triangular-monopole antenna is broader than that of the T-monopole antenna. The bandwidth of triangular-monopole antenna is broad enough to cover the DCS, PCS, IMT-2000, WLAN and WiMax bands. It’s impedance-matching bandwidth is about 1290 MHz.
Key Words : planar antenna; balanced-fed antenna; IMT-2000; mobile communication; DCS; PCS; WLAN; WiMax。
封面內頁
簽名頁
授權書.........................iii
中文摘要........................iv
英文摘要.......................v
誌謝.........................vi
目錄.........................vii
圖目錄........................ix
表目錄........................xii
第一章 緒論
1.1 前言....................1
1.2 研究動機與目的...............4
1.3 章節概要..................5
第二章 Balun電路
2.1 Balun簡介.................8
2.2 平衡式元件的優點..............10
2.3 Marchand balun...............14
2.4 新型的Marchand balun............14
2.5 Broadside-edge coupled balun.........17
第三章 微帶天線
3.1 微帶天線介紹................23
3.2 微帶傳輸線.................23
3.3 基本天線理論................26
3.4 T型天線設計................33
第四章 平衡式天線
4.1 平衡式T型天線...............41
4.2 平衡式三角天線...............45
第五章 結論
參考文獻........................54
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