臺灣博碩士論文加值系統

本論文旨在設計用於手持式行動設備之多頻段天線設計。首先本論文利用平面倒F型天線，設計用於手機通訊之縮小化四頻段天線，為使體積縮小時能保持有足夠之阻抗頻寬，因此本論文使用基因演算法結合IE3D之數值電磁計算軟體撰寫程式，來進行縮小化之平面倒F型天線最佳化設計，並進行實驗驗證。另外，為了可以涵蓋無線區域網路使用頻帶2.4GHz和5.8GHz，本論文利用併生諧振器之調整與匹配殘段，設計出縮小化符合系統要求之多頻帶PIFA天線。本論文也探討利用接地金屬面之槽隙切割來激發接地面的輻射諧振模態，進而增加阻抗頻寬，達到可以實際應用於手持式行動裝置，實驗結果也驗證此設計之可行性。

In this thesis, we aim at designing multi-bands planar Inverted-F antennas for mobile-communication applications. First, a compact PIFA was proposed and optimally designed using genetic algorithms to achieve low return loss in both GSM band and DCS/PCS/UMTS bands. The prototype is constructed and measured to verify the optimized design obtained by IE3D + GA. Second, using parasitic elements, tuning stub, and meandered cuts, a compact six-band PIFA was designed to achieve low return loss in the GSM band, DCS/PCS/UMTS bands, WiMAX band and WLAN/802.11a band. Then, incorporating open-end slots in ground plane to shrink the antenna size, a PIFA with a defected ground structure was proposed and investigated. These PIFA were fabricated and measurements were performed to verify simulation results. Since the measured results show a good matching over the covered frequency bands and nearly omni-directional radiation patterns, it makes these antennas are suitable for portable devices.

致謝……………………………………………………………………………………..i
摘要……………………………………………………………………….…………...iii
Abstract……………………………………………………………………………......iv
文字目錄……………………………………………………...…………………..........v
圖目錄………………………………………………………………………...……...vii
第一章 序論………………………………………………………………………..….1
1.1. 研究動機與目的…………………………………………..……..…….....1
1.2. 文獻回顧………………………………………..……………..……….…3
1.3. 章節概要……………………………………..………………..………….5
第二章 多頻帶平面倒F型天線原理…………………………………………..…..…7
2.1. PIFA天線原理……………………………………..…………..……..…..7
2.2. PIFA天線特性與天線設計………………………………..….........….9
2.3. 多頻帶PIFA天線………………………………..…………………..…..11
2.4. 結論…………………………………………………………………..….13
第三章 縮小化之多頻段天線設計………………………………………………….24
3.1. 基因演算法簡介…………………………………………………..…….24
3.2. PIFA結構選擇……………………………………………………….….27
3.3. 基因演算法結合IE3D流程圖………………………………………….28
3.4. 定義變數、適應值、適應函數…………………………………………28
3.5. 編碼選擇、配對選擇、配對方式…………………………………...……29
3.6. 突變選擇和停止條件…………………………………………..……….30
3.7. 模擬與實驗結果………………………………………………...………31
3.8. 利用縮小化四頻段PIFA結構進行WLAN2.45GHz與WLAN5.8GHz
設計…………………………………………………………………..….32
3.8.1. WLAN2.45GHz與WLAN5.8GHz之縮小化多頻段PIFA結構
設計………………………………………………………...……..33
3.8.2. 模擬分析與實驗結果……………………………………….…….34
3.9. 結論……………………………………………………………….……..35
第四章 缺陷式接地結構之PIFA結構設計…………………………………….....60
4.1. 雙頻PIFA結構對接地面的影響………………………………..………60
4.2. 雙頻PIFA結構對一個切割凹槽接地面影響…………………………..62
4.3. 利用缺陷式接地面設計五頻段PIFA結構………………………..……63
4.4. 模擬與實驗結果…………………………………………………………64
4.5. 結論…………………………………………………………………..…..65
第五章 結論………………………………………………………………………...83
參考文獻………………………………………………………………….…………85

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