A Balance-fed Wideband Disc Antenna for Mobile Communication Application 林雅菁、邱政男
E-mail: 9806478@mail.dyu.edu.tw
ABSTRACT
Two novel planar are proposed in this thesis for modern mobile communication applications: A disc-slit microstrip antenna and a balance-fed disc-slit antenna. A disc-slit microstrip antenna, has a microstrip line-feeding. The balance-fed disc-slit antenna, is realized by merging a single-ended disc-slit monopole antenna with a defected-ground balun. The resulting antenna has the special merits of high immunity against electromagnetic interference from nearby circuit and less sensitivity to size variation of the
corresponding ground plane.
The balance-fed disc-slit antenna can be designed by three steps: (1) Design an unbalance-fed antenna for the specified band; (2) design a DCL balun for this band; (3) merge the antenna and balun implemented in Steps 1 and 2 into a balance-fed antenna. A prototype was created and examined, and the results obtained demonstrate the promising performance of the newly proposed antenna.
Key Words : planar antenna, disk antenna, balance-fed antenna, mobile communication Keywords : planar antenna、disk antenna、balance-fed antenna、mobile communication
Table of Contents
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?．．．．．．．．．．．．．．．．．．．．．．．．．．vii 圖目?．．．．．．．．．．．．．．．．．．．．．．．．．ix 表目?．．．．．．．．．．．．．．．．．．．．．．．．．xii 第一章 緒?
1.1 前言．．．．．．．．．．．．．．．．．．．．1 1.2 研究動機與目的．．．．．．．．．．．．．．．7 1.3 章節概要．．．．．．．．．．．．．．．．．．9 第二章 Balun 電?
2.1 Balun 簡介．．．．．．．．．．．．．．．．．10 2.2 平衡式元件優點．．．．．．．．．．．．．．．13 2.3 Coupled line balun．．．．．．．．．．．．．．17 2.4 DCL balun．．．．．．．．．．．．．．．．．27 2.5 新型DCL balun設計．．．．．．．．．．．．．33 第三章 微帶天線
3.1 傳輸線種?．．．．．．．．．．．．．．．．41 3.2 微帶線介紹．．．．．．．．．．．．．．．．43 3.3 天線基本??．．．．．．．．．．．．．．．45 第四章 天線設計與結果討?
4.1 圓盤開槽天線設計．．．．．．．．．．．．．53 4.2 平衡式圓盤開槽天線．．．．．．．．．．．．61
第五章 結?．．．．．．．．．．．．．．．．．．．．．．68
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