本論文的內容針對一些新型設計的印刷槽孔天線之寬頻特性進行分析與探討。在線性極化方面，首先提出利用四根金屬負載分別從槽孔的四個角往槽孔中心延伸來達成寬頻操作的特性。在圓極化方面，主要提出共面波導饋入與微帶線饋入兩種饋入方式來設計寬頻圓極化操作特性，共面波導方面是利用一種新型的饋入帶線來形成圓極化操作特性，微帶線饋入方面是利用一從接地面往槽孔中心延伸的金屬負載，且微帶線從槽孔斜角饋入來達成寬頻圓極化操作特性，最後再提出一種用來縮小圓極化操作頻帶之設計，不僅能有效的達成縮小化的結果，且還能維持住寬頻圓極化之操作特性。

Novel printed slot antennas are demonstrated in this thesis. For the linear polarization design, CPW-fed strip-loaded square slot antenna is presented for achieving broadband operations. For the circular polarization, two novel antenna designs are also presented；one is a CPW-fed square slot antenna with an inverted L tunning stub, and the other is a microstrip line-fed square slot antenna with a conducting strip from ground plane for broadband circularly polarized radiation. Finally, an antenna design having compact size and broadband characteristic is shown.

文字目錄
頁次
文字目錄………………………………………………………………………….i
圖型目錄…………………………………………………………………………iii
表格目錄…………………………………………………………………………v


第一章 序論 (Introduction).………………………...……………..…………….1
1.1 簡介……………………………………………………………………..1
1.2 內容提要………………………………………………………………..3

第二章 植入金屬微帶負載之共面波導饋入的寬頻正方形槽孔天線
(Broadband CPW-Fed Strip-Loaded Square Slot Antenna).……………..5
2.1 簡述……………………………………………………………………..5
2.2 天線設計說明…………………………………………………………..6
2.3 實驗結果與討論………………………………………………………..6

第三章 具有倒L形調整金屬微帶的共面波導饋入的正方形槽孔天線(CPW- Fed Circularly Polarized Square Slot Antenna with an
Inverted L Tuning Stub)……………………………………………...17
3.1 簡述………………………………………………………………….17
3.2 天線設計與設計規則……………………………………………….18
3.2.1 產生圓極化的結構之探討……………………………….….18
3.2.2 使圓極化操作頻段皆能達成阻抗匹配的饋入結構之探討…18
3.3 實驗結果與討論…………………………………………………….19
3.4 結論………………………………………………………………….20

第四章 具有單支接地金屬微帶之寬頻圓極化槽孔天線之設計
(Microstrip Line-Fed Square Slot Antenna with a Conducting Strip
from Ground Plane for Broadband Circularly Polarized Radiation)……32
4.1 簡述……………………………………………………………………32
4.2 天線設計與設計規則…………………………………………………32
4.3 實驗結果與討論………………………………………………………33
4.4 結論……………………………………………………………………34

第五章 縮小化的圓極化槽孔天線之設計(Compact CPW-Fed Square Slot Antenna for Broadband Circularly Polarized Radiation)……..…….……...44
5.1 簡述……………………………………………………………………44
5.2 天線設計與設計規則…………………………………………………44
5.3 實驗結果與討論………………………………………………………45
5.4 結論……………………………………………………………………46
第六章 總結 (Conclusions)…………………………………………………….53
參考文獻 (References)……………………………………………………………54

圖形目錄
頁次
圖2.1 植入四條窄金屬微帶之寬頻槽孔天線結構圖………………………10
圖2.2 未植入四條窄金屬微帶之寬槽孔天線的反射損失頻率響應圖….….11
圖2.3 未植入四條窄金屬微帶之寬槽孔天線之輻射場型圖………………..12
圖2.4 植入四條窄金屬微帶之寬槽孔天線的反射損失頻率響應圖
(l2 = 24.5 mm)…………………………………………………………..13
圖2.5 植入四條金屬微帶之寬槽孔天線之輻射場型圖……….…………….14
圖2.6 未植入四條窄金屬微帶與植入四條窄金屬微帶之寬槽孔天線之
增益比較圖………………………………………………..…..……...15
圖2.7 植入四條窄金屬微帶之寬槽孔天線的反射損失頻率響應圖
(l2 = 23 mm)…………………………………………………………..16
圖3.1 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
結構圖……………………………………………………………….….22
圖3.2 在不同饋入結構的長度尺寸時的史密斯阻抗圖……………….…….23
圖3.3 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
之圓極化軸比頻寬圖(l1 = 31 mm，l2 = 21.5 mm)………………...…..24
圖3.4 在不同饋入結構的長度尺寸時的史密斯阻抗圖
(l1 = 31 mm，l2 = 21.5 mm)…..………………………………………..25
圖3.5 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
之增益圖(l1 = 31 mm，l2 = 21.5 mm)………………………………….26
圖3.6 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
之場型圖(天線二)……………...………………………………………27
圖3.7 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
之圓極化軸比頻寬圖(l1 = 31 mm，l3 = 13.8 mm)…………….………28
圖3.8 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
之圓極化軸比頻寬圖(l2 = 21.5 mm，l3 = 13.8 mm)……………….….29
圖3.9 在不同饋入結構的長度尺寸時的史密斯阻抗圖
(l1 = 21.5 mm，l3 = 13.8 mm)………………………………………….30
圖3.10 具有倒L型的調整金屬微帶的共面波導饋入的正方形槽孔天線
之增益圖(l1 = 21.5 mm，l3 = 13.8 mm)…………………...….……….31
圖4.1 具有單支接地金屬微帶之寬頻圓極化槽孔天線結構圖……………..36
圖4.2 具有單支接地金屬微帶之寬頻圓極化槽孔天線之圓極化軸比頻寬圖………………………………………………………………….….…37
圖4.3 具有單支接地金屬微帶之寬頻圓極化槽孔天線之史密斯阻抗圖
(天線二)………………………………………………………………...38
圖4.4 具有單支接地金屬微帶之寬頻圓極化槽孔天線之場型圖(天線二)...39
圖4.5 具有單支接地金屬微帶之寬頻圓極化槽孔天線之圓極化軸比頻
寬趨勢圖………………………………………………………………..40
圖4.6 具有單支接地金屬微帶之寬頻圓極化槽孔天線之圓極化軸比頻
寬趨勢圖………………………………………………….…………….41
圖4.7 具有單支接地金屬微帶之寬頻圓極化槽孔天線之史密斯阻抗圖
(天線四)……………………………………………………………..….42
圖4.8 具有單支接地金屬微帶之寬頻圓極化槽孔天線之增益圖(天線四)…43
圖5.1 縮小化寬頻圓極化槽孔天線結構圖………………………….…………........48
圖5.2 寬頻圓極化波天線之圓極化軸比的頻率響應圖……………..………..49
圖5.3 縮小化寬頻圓極化波槽孔天線之阻抗匹配圖(天線二至天線四)…....50
圖5.4 縮小化寬頻圓極化波槽孔天線之輻射場型圖(天線四)……………....51
圖5.5 縮小化寬頻圓極化波槽孔天線增益之頻率響應圖(天線四)……...….52



表格目錄
頁次
表2.1 未植入四條窄金屬微帶之寬槽孔天線(l1 = 0)的寬頻特性; er = 4.4, h = 1.6 mm, L = 40 mm, 接地面的面積 = 70 × 70 mm2. 天線的操作頻寬可以由兩10dB反射損失所對應的頻率差值來定義。中心頻率fc是由10dB反射損失的頻寬之最高頻率與最低
頻率之平均值來定義….….……………………………………………..7
表2.2 植入四條窄金屬微帶之寬槽孔天線的寬頻特性; er = 4.4, h = 1.6 mm, L = 40 mm, 接地面的面積 = 70 × 70 mm2. 天線的操作頻寬可以由兩10dB反射損失所對應的頻率差值來定義。中心頻率fc是由10dB反射損失所定義頻寬之最高頻率與最低頻
率之平均值來定義……………………………………………8
表2.3 植入四條窄金屬微帶之寬槽孔天線的頻寬特性; er = 4.4, h = 1.6 mm, L = 40 mm, 接地面的面積 = 70 × 70 mm2. 天線的操作頻寬可以由兩10dB反射損失所對應之間的頻率差值來定義。中心頻率fc是由10dB反射損失的頻寬之最高頻率與最低
頻率之平均值來定義………………………………………….………...9
表3.1 具有倒L形的調整金屬微帶的共面波導饋入的正方形槽孔天線之圓極化特性；er = 4.4, h = 1.6 mm, L = 45 mm, Wf = 6.4 mm, g = 0.5 mm, l4 = 7 mm, l5 = 9.37 mm, l6 = 4.5 mm, 金屬接地面的大小 = 70 mm 70 mm. CPBW為圓極化軸比小於3dB的頻寬，取整個CP頻段的3-dB的軸比頻寬的最低頻與最高頻的
平均數為中心頻率fc…………………………………………………...21
表4.1 具有一接地金屬微帶的微帶線饋入式正方形槽孔天線之參數與圓極化特性表；er = 4.4, h = 1.6 mm, L = 45 mm, Wf = 3.1 mm, 接地面的大小 = 70 mm 70 mm. 個別描述3-dB和1.5-dB的軸比頻寬, 取3-dB的軸比頻寬的最低頻與最高頻的平均數為
中心頻率fc…………………………………………………….………..35
表 5.1 共面波導饋入的縮小化寬頻圓極化正方形槽孔天線之圓極化特性；er = 4.4, h = 1.6 mm, L = 40 mm, Wf = 6.4 mm, g = 0.5 mm,接地面的大小 = 70 mm 70 mm. CPBW為圓極化軸比小於3dB的頻寬，取整個CP頻段的3-dB的軸比頻寬的最低頻與
最高頻的平均數為中心頻率fc……….………………………...……...47

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