本論文是針對具有空氣介質的平面天線，提出新式寬頻設計，作研究分析與探討。其中依天線的操作特性，區分為行動通訊系統與無線區域網路兩大類，每一個部分涵蓋行動通訊裝備小型天線與基地台。在論文中，提出十餘種新式寬頻設計，分別用於寬頻、雙頻、雙寬頻、圓極化、雙極化與分集天線的操作。每個天線設計中，以實驗量測之阻抗頻寬、輸入阻抗匹配、輻射場型與天線增益值，作為調整依據，輔以模擬值協助理論分析，以驗證設計構想與推論之正確性。所獲得的成果如：使用新式的饋入方法，在寬頻的操作部分，可使操作頻寬比達到10%（1.5：1 VSWR）；圓極化操作方面，使用新式單饋入點共面饋入，在3 dB軸比頻寬可達10%以上；在雙極化及分集天線上的操作，隔離度在操作頻段內均在-30 dB以下。另外在天線的縮小化方面，天線的高度與厚度，經由摺疊或路徑蜿蜒，可小於操作波長的5%以下。所提出的天線的各項操作性，均適用於現行無線通訊系統。

Novel broadband designs of planar antenna with an air substrate are proposed in this dissertation, The operating bands considered include the GSM/DCS band and ISM band. Several antenna designs capable of dual- polarized operation, circularly polarized radiation, and diversity operation are also presented.In these antenna designs, prototypes were constructed. The measured input impedance, return loss, radiation pattern, and antenna gain are presented and discussed. The commercially available simulation software are also used in verifying the measured results.As for the broadband planar antenna designs, the impedance bandwidth obtained reaches about 10% (1.5：1VSWR). For the circularly polarized designs, we propose a low-cost, broadband circularly polarized patch antenna fed by a coplanar probe feed, and circular polarization (CP) radiation over a wide frequency range (＞10%) can be achieved. High isolation between two feeding ports (S21 less than –30 dB) can be obtained for the constructed prototype of the proposed dual-polarized design. On the other hand, wrapping a planar monopole into a compact box-like structure allows the antenna’s total height less then 5% of the wavelength at 900 MHz. The proposed antennas are suitable for wireless communications applications.

文 字 目 錄
頁次
文字目錄 ……………………………………………………………………………i
圖形目錄 ……………………………………………………………………………iv
表格目錄 ……………………………………………………………………………ix

第一章 序論 (Introduction)………………………………………………………...1
1.1 概述……………………………………………………………………………1
1.2 文獻導覽 ……………………………………………………………………..2
1.3 內容提要………………………………………………………………………4

第二章 適用於行動通訊手機天線(Mobile Phone antennas)………………………6
2.1 概述…………………………………………………………………………….6
2.2 具有可表面包裹雙路徑適用於GSM/DCS頻帶之雙頻單偶極天線………..9
2.2.1天線設計原理…………….………………………………………...……...9
2.2.2實驗結果與分析………….………………………………………………10
2.3具有路徑摺疊適用於GSM/DCS頻帶之雙頻單極天線……………………17
2.3.1 天線設計原理………………………………………………….……...…17
2.3.2 實驗結果與分析…………………………………………………………18
2.4具有螺旋式單路徑適用於GSM/DCS頻帶之雙頻天線………………….…26
2.4.1 天線設計原理………………………………...………………………….26
2.4.2 實驗結果與分析……………………………………...………………….26
2.5具有路徑摺疊適用於GSM/DCS/PCS頻帶之雙寬頻天線…………………34
2.5.1 天線設計原理……………………………………………………………34
2.5.2 實驗結果與分析…………………………………………………………35
2.6 討論……………………………………………………………….…………..43

第三章 適用於行動通訊系統基地台之天線
(Base-Station antennas for mobile communications)…..…………………….45
3.1 概述…………………………………………………………………….……..45
3.2 具有厚空氣介質及使用圓柱形饋入寬頻平面天線………………………..49
3.2.1 天線設計原理……………………………………………………….…….49
3.2.2 實驗結果與分析…………………………………………………….…….50
3.2.3 一種具有降低交叉極化陣列天線的設計………………………….…….52
3.3 具有厚空氣介質及使用三角形金屬片饋入寬頻平面天線……………….62
3.3.1 天線設計原理…………………………………………………………….62
3.3.2 實驗結果與分析………………………………………………………….62
3.4 具有厚空氣介質及使用L形接地面共面饋入寬頻平面天線….………….74
3.4.1 天線設計原理……………………………………………………………74
3.4.2 實驗結果與分析…………………………………………………………74
3.5 具有厚空氣介質及使用L形接地面共面饋入與寄生金屬片之雙寬頻
平面天線…………………………………………………………………...…81
3.5.1 天線設計原理………………………………………………..……………81
3.5.2 實驗結果與分析………………………………………………...………...82
3.6 具有厚空氣介質及使用U形接地面共面饋入雙寬頻平面天線…………..89
3.6.1 天線設計原理……………………………………………………..………89
3.6.2 實驗結果與分析…………………………………………………………..90
3.7 具有厚空氣介質及使用摺疊方式縮小天線尺寸之研究…………..……….98
3.7.1 天線設計原理………………………………..……………………..……..98
3.7.2 實驗結果與分析…………..………………………………………………99
3.8 討論………………………………………………………………………….108

第四章 適用於無線區域網路行動設備之天線 (WLAN mobile-unit antennas)...110
4.1 概述………………………………………………………………………….110
4.2 具有單一路徑可表面黏著之平面天線…………………………………….112
4.2.1 天線設計原理……………………………………..……………………..112
4.2.2 實驗結果與分析…………………………………………..……………..113
4.3 具有雙路徑可表面黏著之平面天線……………………………………….121
4.3.1 天線設計原理…………………………………………………..………..121
4.3.2 實驗結果與分析………………………………………………..………..122
4.4 討論………………………………………………………………………….128

第五章 適用於無線區域網路橋接點之天線 (WLAN access-point antennas)...131
5.1 概述……………………………………………………………….…………131
5.2 具有厚空氣介質及使用三角形雙點饋入之雙極化平面天線…………….133
5.2.1 天線設計原理……………………………………………………………133
5.2.2 實驗結果與分析 ………………………………………………………..134
5.3 具有厚空氣介質及使用L形接地面共面饋入之寬頻圓極化平面天線…142
5.3.1 天線設計原理……………………………………………………………142
5.3.2 實驗結果與分析…………………………………………………………143
5.4 具有厚空氣介質及使用共面饋入之空間分集雙寬頻平面天線………….152
5.4.1 天線設計原理……………………………………………………………152
5.4.2 實驗結果與分析…………………………………………………………153
5.5 討論…………………………………..……………………………………...163

第六章 結論 (Conclusions)………………………..……………………………...164
6.1 前言………………………………………………………………………….164
6.2 重要成果…………………………………………………………………….164
6.3 未來發展展望……………………………………………………………….168

參考文獻 (References)…………………………………………..…………………169

參 考 文 獻
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