臺灣博碩士論文加值系統

本篇論文設計了二款支援多頻段之天線，嚴格講起來，是採用同樣ㄧ種設計架構，設計出兩種不同尺寸之天線。這兩款天線設計架構是採用Print Dipole(印刷偶極)天線的設計方法，為求經濟、快速製作以及考慮成本低廉這三項因素，這二款天線都是以目前非常普遍之FR-4 玻璃纖維基板為材料，並考慮天線的特性盡可能將尺寸縮小化，以符合實用上之需求。
第二支天線為延續第一支天線之設計方法，以不流失太多天線特性為前提，將天線尺寸進行縮小化，這二款天線的不同點，為天線輻射銅箔迴路的形狀設計不同，進而產生尺寸縮小效果，終極目標主要都是期望所設計出來的天線所涵蓋頻帶範圍廣，適合目前市面上現有無線通訊系統之用途。
過程中，吾人不斷使用模擬軟體來調整天線輻射單元外型與尺寸，期望天線的特性能夠更為完美，以創作出更具有實用價值的天線，研究的目的是希望所設計出來之天線，日後能適用於未來整合多頻段的上網設備或通訊產品，如AP、ROUTER、小型區網基地台、無線電話…等設備，其天線頻段希望能涵蓋GSM 900MHz / PCS 1800 MHz / PHS 1900 MHz / CDMA 2100 MHz / WiFi 2.4GHz / WIMAX 2.5~2.7GHz 。
為了使設計的天線能夠使用於各個無線通訊系統，藉由調整輻射銅箔金屬面的長度與形狀，便可輕易使得天線產生之共振頻率，符合吾人所欲設計的頻段，以達成天線可以多頻段使用的目的。
在此要特別強調的是，此次設計天線涵蓋的頻段，計畫將2009年非常熱門的WiMAX 通訊系統的頻段2.5~2.7GHz頻段考慮在內，以便日後此天線也能馬上適用於WiMAX之通訊系統。天線設計方法是藉由將兩組對稱輻射體，以類似偶極天線型式直接印刷在玻璃纖維基板上，如此做法可以達到天線電路與基板容易結合，提昇製作上的便利性與降低製造成本，這也是本研究所期望達到的主要目的之一。

This thesis presents the design of two printed dipole antennas. These two antennas were developed to produce multiple resonant bands so as to support multi-standard wireless-communication products, such as laptop computers, personal digital assistances (PDAs), and mobile wireless networking devices. These standards include GSM 900 MHz (Global System for Mobile Communications; 870-960 MHz), DCS 1800 MHz (Digital Communication System; 1710-1880 MHz), PHS 1900 MHz (Personal Handy-Phone System; 1890-1915 MHz), WCDMA 2100 MHz (Wideband Code-Division Multiple Access; 2100-2170 MHz), WiFi 2.4 GHz (Wireless Local-Area Network; 2400-2483 MHz; also called WLAN), and WiMAX 2.6 GHz (Worldwide Interoperability for Microwave Access; 2.5-2.7 GHz). Note that the antennas presented here were originally designed for FarEastone telecommunications company (FET), for which the required GSM and DCS bands are in the ranges of 870-890 MHz and 1800-1880 MHz, respectively. For these two standards, the designed antennas must cover these two frequency bands, instead of 870-960 MHz and 1710-1880 MHz.
For cost saving, the antennas were printed on FR4 substrates with a thickness of 1 mm. Numerical simulation was carried out using Zeland’s IE3D, a full-wave electromagnetic simulator. Before antenna prototypes were constructed and measured, the structural parameters of the designed antennas were varied iteratively until antenna performances are close to the required specifications.
The first antenna type is a co-directionally meandered dipole antenna, in which the structures in the two arms of the antenna are almost symmetric with respect to the feeding point. The second antenna type is a bi-directionally meandered dipole antenna, in which the structures in the two arms are nearly anti-symmetric with respect to the feeding point. It is observed that the bi-directionally meandered dipole antenna is slightly more compact than the co-directionally meandered one.

封面內頁
簽名頁
授權書．．．．．．．．．．．．．．．．．．．．．．．．．iii
中文摘要．．．．．．．．．．．．．．．．．．．．．．．．iv
英文摘要．．．．．．．．．．．．．．．．．．．．．．．．vi
致謝 ．．．．．．．．．．．．．．．．．．．．．．．．．viii
目錄．．．．．．．．．．．．．．．．．．．．．．．．．．ix
圖目錄．．．．．．．．．．．．．．．．．．．．．．．．．xi
表目錄．．．．．．．．．．．．．．．．．．．．．．．．．xiv

第一章　序 論
1.1 前言．．．．．．．．．．．．．．．．．．．．1
1.2 研究動機．．．．．．．．．．．．．．．．．．3
1.3 論文章節介紹．．．．．．．．．．．．．．．．5
第二章　理論分析與設計構想
2.1 天線的原理．．．．．．．．．．．．．．．．．7
2.1-1 天線動作原理．．．．．．．．．．．．．．7
2.1-2 天線的分類．．．．．．．．．．．．．．．8
2.2 常見天線的類型．．．．．．．．．．．．．．．9
2.3 天線設計構想 ．．．．．．．．．．．．．．．18
2.4 天線設計流程 ．．．．．．．．．．．．．．．19
第三章　具同向蜿蜒線路之多頻段天線設計
3.1 概述．．．．．．．．．．．．．．．．．．．22
3.2 天線的架構 ．．．．．．．．．．．．．．．．23
3.3 天線的模擬與比較．．．．．．．．．．．．．26
3.4 天線的實作與分析．．．．．．．．．．．．．29
3.5 天線特性的微調．．．．．．．．．．．．．．31
3.6 本章結論．．．．．．．．．．．．．．．．．33
第四章　具反向蜿蜒線路之多頻段天線設計
4.1 天線的架構．．．．．．．．．．．．．．．．． 34
4.2 天線的模擬與分析．．．．．．．．．．．．．． 37
4.2-1 天線模擬之VSWR結果．．．．．．．．．37
4.2-2 天線模擬之場型、增益結果．．．．．．．39
4.3 天線的實作與量測 ．．．．．．．．．．．．．40
4.3-1 天線量測結果．．．．．．．．．．．．．．41
4.3-2 天線場型與增益實測．．．．．．．．．．．44
4.4 本章結論 ．．．．．．．．．．．．．．．．．53
第五章　結 論．．．．．．．．．．．．．．．．．．．．．54
參考文獻．．．．．．．．．．．．．．．．．．．．．．．．56

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