臺灣博碩士論文加值系統

本論文以微帶天線縮小化為設計主軸。首先將殘段集總元件延凹槽式微帶天線之訊號線兩側槽孔，內嵌至天線主體內部，以不超過二分之ㄧ波長為前提，形成開路結構而產生串聯電容的效應，達到第一階段的阻抗匹配；再藉由映像原理將天線長度有效縮減一半，以完成第二階段的縮小化工作，此方法不僅能維持所要的共振頻率，亦能大大地減少天線整體尺寸，利於與微波積體電路做更有效率的整合。
接著，提出折疊式槽孔微帶天線設計，並以貫孔做為路徑連接，藉由增加共振源的方式改善天線的應用頻寬及輻射效率，產生共振效應後在空間中形成上下約略對稱的輻射場型。同時，以此架構將天線的共振頻帶設計為多頻段的應用範疇，利用多重共振路徑的基本原則，並控制共振頻率在特定頻率點完成阻抗匹配，進而使操作頻率包含行動通訊、WLAN及WiMAX頻段，來驗證此構想。
最後，則是利用週期性結構表面波抑制之特性，結合包覆式結構機制提高天線指向性，調整結構參數使本論文所討論的縮小化天線增益獲得改善。

The main theme of this thesis is the miniaturization of microstrip antennas. First, a lumped stub element along the two slots of a recessed microstrip antenna is added into the interior of a patch antenna. The length of the stub is restricted to half wavelength to form an open circuit stub which introduces a series capacitance. Thus, the first stage work of impedance matching is achieved. Second, by Image theory, the length of the antenna is reduced to half. This accomplishes the second stage work of minimizing the antenna, resulting in significant reduction in antenna size while maintaining the same resonant frequency. This is beneficial to the integration of the antenna to microwave circuits.
Then, the design of folded slot microstrip antennas with via hole connections is presented. By adding more resonators, the bandwidth and radiation efficiency are increased. The radiation patterns are approximately symmetry in the upper and lower spaces. Similarly, the multiple-resonator technique can be used to design multiple-band antennas. By utilizing the principle of multiple resonant paths, different operation frequencies can be implemented after impedance matching is achieved at these frequencies. As a verification of this concept, an antenna operating in mobile communication, WLAN and WiMAX frequency bands is designed and tested. Good result is achieved.
Finally, periodic structures for suppressing surface waves and dielectric covers are used to enhance the gains of the antennas. This technique is applied to previous antennas to compensate the reduction in gains due to miniaturization.

指導教授推薦書………………………………………………………
口試委員會審定書……………………………………………………
授權書………………………………………………………………… iii
誌謝…………………………………………………………………… iv
中文摘要………………………………………………………………… v
英文摘要………………………………………………………………… vi
目錄…………………………………………………………………… vii
圖目錄…………………………………………………………………… x
表目錄………………………………………………………………… xv
第一章 序論………………………………………………………… 1
1.1前言……………………………………………………………… 1
1.2研究動機與背景………………………………………………… 2
1.3研究目的………………………………………………………… 5
1.4內容提要………………………………………………………… 6
第二章 微帶線饋入式微帶天線………………………………… 8
2.1概述……………………………………………………………… 8
2.2微帶線饋入式微帶天線……………………………………… 9
2.2.1微帶天線基本理論與結構分析………………………… 9
2.2.2天線設計……………………………………………… 11
2.2.3 結構參數之分析……………………………………… 13
2.3凹槽式微帶線饋入天線.......................... 15
2.4 結果與討論.................................. 16
第三章 微帶天線縮小化設計………………………………………… 28
3.1概述…………………………………………………………… 28
3.2內嵌式殘段之微帶天線……………………………………… 29
3.2.1 天線設計.................................... 29
3.2.2殘段效果驗證及參數影響......................... 31
3.2.3 結果與討論................................ 32
3.3映像原理之微帶天線………………………………………… 34
3.3.1映像原理…………………………………………………… 35
3.3.2天線設計…………………………………………………… 37
3.3.3 結果與討論……………………………………………… 38
3.4折疊式槽孔微帶天線………………………………………… 41
3.4.1 天線設計………………………………………………… 41
3.4.2槽孔寬度的影響………………………………………… 44
3.4.3 結果與討論……………………………………………… 46
3.5縮小化微帶天線板寬之影響………………………………… 48
3.6結論…………………………………………………………… 50
第四章 微帶天線多頻段應用與增益改善之研究………………… 73
4.1概述…………………………………………………………… 73
4.2多頻段微帶天線設計與應用..……………………………… 74
4.2.1操作原理與天線設計………………………………… 74
4.2.2 結果與討論…………………………………………… 76
4.3週期性結構微帶天線設計………………………………… 80
4.3.1週期性結構之基本概念……………………………… 80
4.3.2結構參數之影響……………………………………… 82
4.3.3包覆式結構機制與天線設計………………………… 83
4.3.4 結果與討論………………………………………… 84
4.4結論…..…………………………………………………… 86
第五章 結論………………………………………………………… 103
參考文獻…………………………………………………………… 106

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