臺灣博碩士論文加值系統

本論文提出兩支應用於WLAN / WiMAX操作頻帶之天線，研究之天線皆使用FR4板材的簡單結構。首先提出一共平面波導饋入天線，使用4根枝狀結構，分別控制其共振模態達到阻抗匹配，量測頻寬範圍分別2.35~2.81GHz、3.3~3.87GHz 及5.02~6.11GHz，涵蓋的頻段符合WLAN ( IEEE 802.11 a/b/g ) 與WiMAX ( IEEE 802.16x )系統的要求。另提出以微帶線饋入之平面天線設計與分析，此天線之金屬輻射面是使用環型的方式設計，並且在中間加入U型殘段一起激發三個模態，利用接地面的截角和開槽，改善高頻的阻抗匹配。實際量測頻寬範圍分別涵蓋2.33~2.75GHz及3.26~6.05GHz，也都符合WLAN與WiMAX所規範的頻段，且於各頻段皆有全向性輻射場型。

In this thesis, we have proposed two types of antennas for WLAN / WiMAX applications. Both designs were fabricated on FR4 substrates with simple structure. The first proposed antenna fed by a CPW line consists of a four-branch structure which control the resonant modes to achieve good impedance match. The designed antenna depicted return loss of 10 dB for the entire bandwidth range from 2.35~2.81 GHz, 3.3~3.87 GHz, and 5.02~6.11 GHz. The covering frequency bands conform to the specification of WLAN ( IEEE 802.11a/b/g ) and WiMAX ( IEEE 802.16x ) applications. The second planar antenna fed by a microstrip line consists of a ring and U-shaped strip to excite three resonant modes. Bevel edge and slot on the ground plane have been constructed to improve impedance matching at higher frequency. The second designed also exhibit return loss of 10 dB for the entire bands of 2.33~2.75 GHz and 3.26~6.05 GHz, conforming to the requirement of WLAN/ WiMAX. The radiation patterns of both antenna designs show omni-directional characteristic in the operation bands.

中文摘要 i
英文摘要 ii
誌謝 iii
文字目錄 iv
圖形目錄 vii
表格目錄 xi
第一章 序論 ( Introduction )
1.1 研究背景 1
1.2 研究動機與目的 4
1.3 文獻回顧 5
1.4 內容提要 6
第二章 天線基礎理論
2.1 偶極天線 ( Dipole Antenna ) 8
2.2 單極天線( Monopole Antenna ) 13
2.3 迴路天線 (Loop Antenna) 16
2.4 極化(Polarization) 18
2.5 電壓駐波比(VSWR) 19
第三章 應用於WLAN/WiMAX之多頻帶單極天線設計 ( Design of Multi-band Monopole Antenna for WLAN / WiMAX Applications)
3.1 天線設計 20
3.2 結果與討論 24
3.3 天線結構之參數分析 36
3.3.1 多頻帶單極天線隨W1參數變化 36
3.3.2 多頻帶單極天線隨W3參數變化 37
3.3.3 多頻帶單極天線隨W4參數變化 38
3.3.4 多頻帶單極天線隨L2參數變化 39
3.3.5 多頻帶單極天線隨Lg參數變化 40
3.3.6 多頻帶單極天線隨g參數變化 41
第四章 應用於WLAN/WiMAX之對稱型單極天線設計 ( Design of Symmetrical Monopole Antenna for WLAN / WiMAX Applications)
4.1 天線設計 43
4.2 結果與討論 47
4.3 天線結構之參數分析 57
4.3.1 相似結構之探討 57
4.3.2 對稱型單極天線隨W1參數變化 59
4.3.3 對稱型單極天線隨L2參數變化 60
4.3.4 對稱型單極天線隨W4參數變化 61
4.3.5 對稱型單極天線隨Ws參數變化 62
4.3.6 對稱型單極天線隨a參數變化 63
第五章 結論 ( Conclusion ) 65
參考文獻 ( References ) 67

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[64] 謝宣威，手機天線設計之應用，碩士論文，國立臺灣海洋大學，台北，2009。
[65] 鄭宏志，應用於WLAN/WiMAX系統之平面單極天線設計，碩士論文，國立臺灣海洋大學，台北，2011。