本項研究主要是整合饋入網路與平面天線，來達成新型平面天線之設計。藉由加入適當被動元件所構成的饋入網路與平面天線的整合，可以改善平面天線的各項特性（圓極化軸比頻寬、交叉極化位準、雙極化天線隔離度及高階模態的控制）或達到雙頻的操作。本論文一共分為以下五部分：一、利用威金森功率分配器與具有90°相差的支路耦合器設計寬頻圓極化平板天線，此種設計之3-dB軸比頻寬都能大於30%，而這點是一般採用單饋入圓極化天線所遠遠不及；二、利用加入多段的開路微帶線段的帶拒饋入網路，設計出雙寬頻的平板天線；三、利用兩輸出埠具有180°相差的威金森功率分配器，設計出具有高隔離度及高交叉極化位準的雙極化平板天線；四、操作於GSM900/1800的雙頻雙極化平板天線設計；五、加入多段開路微帶線的帶拒饋入網路與p形低通饋入網路應用於高階諧振的控制。

Novel designs of planar antennas including the feed network for improving the antenna performance improvement (CP axial-ratio bandwidth, XPL, port decoupling for dual-polarized operation, and harmonic control) or achieving dual-band operation are presented. This thesis, comprises five sections. Firstly, for obtaining broadband CP designs, the Wilkinson power divider and branch-line coupler are used. The 3-dB axial ratio CP bandwidths of all proposed antennas are larger than 30%. Secondly, the dual broadband patch antennas including a stopband network are proposed. Thirdly, the dual-polarized patch antenna with high XPL and isolation between two ports by using a Wilkinson power divider with a 180° phase shift between its two ports is proposed. Fourthly, the dual-band and dual-polarized patch antenna suitable for base-station antenna applications for mobile communications systems is studied. Finally, the harmonic control study of a square microstrip antenna is presented.

第一章 序論 (Introduction) ……………………………………… 1
1. 1 概述 …………………………………………………………… 1
1. 2 文獻導覽 ……………………………………………………… 1
1. 3 內容提要 ……………………………………………………… 2

第二章 雙饋入之寬頻圓極化設計
(Broadband Circularly Polarized Patch Antennas) ………….. 5
2. 1 概述 ……………………………………………………………. 5
2. 2 天線設計 ……………………………………………………… 5
2. 3 實驗結果與模擬分析 ………………………………………… 13
2. 3. 1 威金森功率分配器與支路耦合器之介紹…………… 13
2. 3. 2 電容式耦合饋入與威金森功率分配器之整合設計.. 18
2. 3. 3 槽孔耦合饋入與威金森功率分配器之整合設計….. 25
2. 3. 4 間隙耦合饋入與威金森功率分配器之整合設計….. 29
2. 3. 5 電容式耦合饋入與支路耦合器之整合設計………… 34
2. 4 心得與討論 …………………………………………………… 39

第三章 雙寬頻平板天線設計
(Dual Broadband Patch Antennas) ……………………………. 40
3. 1 概述 …………………………………….………………..……. 40
3. 2 天線設計 ……………………………………………………… 40
3. 3 實驗結果與分析 ……………………………………………. 48
3. 3. 1 饋入網路之設計 …………………………………… 48
3. 3. 2 兩天線與饋入網路之整合設計 …………………… 52
3. 3. 3 單一輻射金屬片與饋入網路之整合設計………….. 59
3. 4 心得與討論 ……………………………………….…………. 62

第四章 寬頻雙極化平板天線設計
(Broadband Dual-Polarized Patch Antennas) ..………. 63
4. 1 概述 …………………………………………………….……. 63
4. 2 天線設計 ……………………………………………….……. 64
4. 3 實驗結果與模擬分析 ………………………………….……. 71
4. 3. 1 接地面尺寸對雙極化天線之影響 .………….…… 71
4. 3. 2 間隙耦合與槽孔耦合之雙極化設計 ………….…… 76
4. 3. 3 電容式耦合與槽孔耦合之雙極化設計 …………. 84
4. 4 心得與討論 ………………………………………………….. 95

第五章 雙頻雙極化天線設計
(Dual-Band Dual-Polarized Patch Antennas) ….….. 96
5. 1 概述 ………………………………………………..………… 96
5. 2 天線設計 ……………………………………….……………. 96
5. 3 實驗結果與模擬分析 ……………………………..………… 105
5. 3. 1 縮小化雙頻雙極化天線設計………………………. 105
5. 3. 2 行動通訊基地台平板陣列天線研製 ……………… 110
5. 4 心得與討論 …………………………………………………. 119

第六章 天線之高階諧振諧振控制
(Harmonic Control of a Square Microstrip Antenna)
………………………………….…..…………...…… 120
6. 1 概述 ………………………………………………..……… 120
6. 2 天線設計 ……………………………….…..…….………. 120
6. 3 實驗結果與分析 ……………………………..……..……. 127
6. 3. 1 帶拒饋入網路與天線之整合設計 …………….… 127
6. 3. 2 低通饋入網路與天線之整合設計 ……………… 137
6. 4 心得與討論 ………………………………………..………… 143

第七章 結論 (Conclusions) ………………………….…..…………… 144

參考文獻 (References) ……………………………….….…………… 147

附錄A 論文著作表 (Publication List) ……………………………… 154

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