A new miniaturized wideband microstrip Balun design 游少軍、邱正男
E-mail: 343859@mail.dyu.edu.tw
ABSTRACT
This thesis proposes a new miniaturized wideband coupled-line microstrip balun and its design procedure based on an original finding. This finding suggests that the coupled-line microstrip balun can be realized by employing a much smaller high-pass ground defect instead of a bandstop ground defect. The newly proposed balun is derived initially from a coupled-line microstrip balun with a typical dumbbell-shaped defected ground. Following the proposed three-step design procedure, the size of the final balun is only about 8.3% of the size of the initial one. In addition, the final balun prossesses immunity against the influence of the supporting material. Balun prototypes were created and investigated. Both the simulated and measured results demonstrate the compactness and wideband performance. Finally, the new balun is merged with unbalance-fed antennas into balance-fed ones.
Keywords : Wideband balun、coupled-line balun、defected ground structure Table of Contents
封面內頁 簽名頁 中文摘要．．．．．．．．．．．．．．．．．．．．．．．．iii ABSTRACT．．．．．．．．．．．
．．．．．．．．．．．．．iv 誌謝．．．．．．．．．．．．．．．．．．．．．．．．．．v 目錄．．．．．．．．
．．．．．．．．．．．．．．．．．．vi 圖目錄．．．．．．．．．．．．．．．．．．．．．．．．．viii 表目錄．
．．．．．．．．．．．．．．．．．．．．．．．．x 第一章 序論．．．．．．．．．．．．．．．．．．．．． 1 1.1 前言．．．．． ．．．．．．．．．．．．．．．．．．1 1.2研究動機與目的．．．．．．．．．．．．．．．．．
．．5 1.3章節概述．．．．．．．．．．．．．．．．．．．．．．5 1.4 Balun電路．．．．．．．．．．．．．．．．
．．．．．6 1.5平衡式元件．．．．．．．．．．．．．．．．．．．．．8 第二章 新穎小型化寬頻微帶線Balun之設計
．．．．．．．．12 2.1簡介．．．．．．．．．．．．．．．．．．．．．．．．12 2.2 Balun的設計過程與實驗結果．
．．．．．．．．．．．．13 2.3 高通與帶拒的探討 ．．．．．．．．．．．．．．．．．23 2.4 結論 ．．．．．．．．
．．．．．．．．．．．．．．．26 第三章 Balun之應用:平衡式天線設計與結果討論 ．．．．．27 3.1 平衡式寬頻天線 之設計．．．．．．．．．．．．．．． 27 3.2 平衡式多頻天線之設計 ．．．．．．．．．．．．．．．31 第四章 結 論 ．．．．．．．．．．．．．．．．．．．．．36 參考文獻 ．．．．．．．．．．．．．．．．．．．．．．．37 REFERENCES
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