適用於無線區域網路個人數位助理之新型天線設計在本論文中提出，本新型天線包含三個不同結構的設計，都為內建式天線且其操作頻寬都涵蓋無線區域網路2.4 GHz以及5.2 GHz雙頻帶操作(2:1 VSWR)。在第二與第三章中，分別提出兩個可表面黏著的新型天線設計；與習知的陶瓷天線作比較，表面黏著天線一般成本低廉且堅固。另外，兩新型天線都為低姿勢且有著良好的匹配頻寬，尤其第三章所提出的設計更能涵蓋一些現行於無線區域網路5 GHz及其附近頻率的頻帶。最後，在第四章中，提出一個印刷於微波基板雙表面的新型平面螺旋天線，非常適合印刷與整合於個人數位助理PDA的電路板上。

Novel antennas attractive to fit in the internal space of a PDA (Personal Digital Assistant) for WLAN (Wireless Local Area Network) operations are presented in this dissertation. The proposed antennas have in common good impedance bandwidth (defined by 10 dB return loss), covering the dual-band WLAN operation in the 2.4/5.2 GHz bands. Two novel designs of foam-base surface-mount antennas are proposed in Chapters 2 and 3. Surface-mountable antennas, compared with ceramic antennas, are generally low cost in fabrication and rigid in nature. Low-profile and good dual-band operation of the proposed surface-mountable antennas can be observed in Chapters 2 and 3, and in addition, a few present-day WLAN bands at 5 GHz are covered in the operating bandwidths of the proposed foam-base surface-mountable shorted monopole antenna, shown in Chapter 3. Finally, in Chapter 4, a novel planar helical antenna printed on both surfaces of a dielectric substrate is demonstrated. This patent-pending helical antenna is very suitable to print and integrate on a circuit board of a PDA device for 2.4/5.2 GHz WLAN operation.

文 字 目 錄
頁次
文字目錄 ..... i
圖形目錄 ..... iii

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 ..... 3

第二章 低成本可表面黏著之單極天線設計
(Low-Cost Surface-Mount Monopole Antenna Design) ..... 5
2.1 天線設計 ..... 6
2.2 實驗與模擬結果 ..... 9
2.3 分析與討論 ..... 16

第三章 可表面黏著之短路單極天線設計
(Surface-Mount Shorted Monopole Antenna Design) ..... 17
3.1 天線設計 ..... 18
3.2 實驗與模擬結果 ..... 21
3.3 分析與討論 ..... 28

第四章 平面螺旋天線設計
(Planar Helical Antenna Design) ..... 29
4.1 天線設計 ..... 30
4.2 實驗與模擬結果 ..... 33
4.3 分析與討論 ..... 38

第五章 結論 (Conclusions) ..... 39

參考文獻 (References) ..... 41

附錄A 論文著作表 (Publication List) ..... 43

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