Analysis and Design of Antennas for Wireless LAN 張書瑋、林明星，詹銘峰
E-mail: 9315103@mail.dyu.edu.tw
ABSTRACT
In this thesis, three distinct designs of printed antennas, used in PCMCIA WLAN card, have been presented. First a 2.4GHz diversity meander-line antenna is constructed. By changing both the length of the line and the width of seams between the lines, it yields a bandwidth of 528MHz. Next a 2.4 and 5.2GHz dual-band antenna is devised. The dual frequency was achieved by adding both a U- and L-shaped slots to a plane inverted-F antenna, a dipole. The uniqueness of this design is the effective use of limited antenna area of the card and it also meets the IEEE 802.11 a/b/g specs all in one. Last a 2x2 patch array antenna is constructed. It serves as a source antenna for setting up a pre-test environment in the work area. The pre-test environment enables preliminary measurement of antenna field patterns. It also facilitates quick fix-up in constructing a target antenna.
Keywords : PCMCIA，平面偶極天線，平面倒F型天線，簡易量測場 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 目錄……… vii 圖目錄………
……… ix 表目錄………xiii 第一章 緒論 1.1 無線區域網路之概述……… 1 1.2 研究動機與目的……… 3 1.3 文獻回顧
……… 3 1.4 論文架構……… 6 第二章 無線網路卡印刷 天線 2.1微帶天線理論……… 7 2.2 分集天線……… 12 2.3 曲折 型天線……… 14 2.4 曲折型天線之設計……… 15 第三章 雙頻微帶天 線設計 3.1 雙頻天線理論……… 21 3.2 雙頻天線設計……… 22 3.2.1 雙 頻U型槽孔偶極天線……… 22 3.2.2 雙頻平面倒F型天線……… 30 第四章 微帶陣列式天線設計與簡易量 測場……… 36 4.1 2x2微帶陣列天線設計……… 36 4.2 簡易天線量測場………
………… 42 4.3 簡易量測場之實際量測……… 44 4.3.1 量測步驟……… 44 4.3.2 天 線實際量測……… 48 第五章 結論……… 54 參考文獻…………
……… 56 附錄A、簡易量測場之圖控軟體程式撰寫與執行……… 58 REFERENCES
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