應用於折疊式行動手機的天線由於其接地面位置會因使用狀態不同而有所變動，所以並不易使得手機在通話與待機狀態下其天線都可保有良好的輻射特性，在待機狀態下輻射效率常會降至 15%以下，針對此一問題，在本論文中我們提出兩項創新的天線設計，第一項為共平面耦合饋入之內藏式平面倒F形天線，其在通話狀態時可達成GSM850/900/DCS/PCS四頻操作，在待機時操作頻帶內的輻射效率則有大於 32%的表現，已能符合業界的需求；而第二項是超寬頻耦合饋入之內藏式迴圈天線，此天線不僅在通話狀態可滿足GSM850/900/DCS/PCS/UMTS五頻操作，在待機時同樣也可保持良好的效能，操作頻帶內的輻射效率皆可在 53%以上，同時我們也探討機殼與使用者手部和頭部對此天線效能的影響，從實驗結果可以發現，機殼對天線輻射效率並不會有太大的影響，但由於手和頭是高損耗的材料，所以會使輻射效率大幅的滑落。

There are large groundplane variations for the folder-type mobile phone in the talk and idle conditions, which makes its embedded antennas not easy to maintain good radiation characteristics in the two states. The radiation efficiencies in the idle condition are often less than 15%. To solve this problem, two novel antennas for the folder-type mobile phone are proposed. The first antenna is the coplanar coupled-fed planar inverted-F antenna. The antenna can cover GSM850/900/DCS/PCS operation in the talk condition, and the radiation efficiencies over the desired operating bands in the idle condition is larger than 32%, which is acceptable for practical applications for the folder-type mobile phone. The second antenna is the ultra-wideband coupled-fed loop antenna. The antenna can cover GSM850/900/DCS/PCS/UMTS penta-band operation in the talk condition. In the idle condition, good performances over the five operating bands can still be obtained, and the radiation efficiencies are better than 53%. The effects of the housing and the user's hand and head on the antenna are also studied. From the obtained results, it is seen that the effects of the housing on the radiation efficiencies are small. However, since the user's hand and head are high-loss materials, large decrease in the radiation efficiencies is usually observed.

文字目錄 i
圖形目錄 iii
表格目錄 vii

第一章 序論 (Introduction) 1
1.1 研究動機 1
1.2 文獻導覽 2
1.3 論文提要 3

第二章 共平面耦合饋入之平面倒F形天線設計 (Coplanar Coupled-Fed Planar Inverted-F Antenna) 5
2.1 天線設計與原理 6
2.2 實驗結果與分析 8
2.3 心得與討論 20

第三章 超寬頻耦合饋入之迴圈天線設計 (Ultra-Wideband Coupled-Fed Loop Antenna) 22
3.1 天線設計與原理 23
3.2 實驗結果與分析 26
3.3 心得與討論 35

第四章 機殼與人體效應對折疊式行動手機的影響與分析 (Effects of Housing and Human Body on the Folder-Type Mobile Phone) 37
4.1 實驗設計 38
4.2 機殼效應對天線的影響與分析 41
4.3 使用者手部對天線的影響與分析 43
4.4 使用者手部與頭部對天線的影響與分析 47
4.5 心得與討論 50

第五章 結論 (Conclusions) 52

參考文獻 (References) 54

論文著作表 (Publication List) 57

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