本論文提出兩種有效利用系統接地面來達成縮小尺寸及增加操作頻寬的手機天線設計，可分別滿足GSM850/1900雙頻及LTE/WWAN七頻所需之操作頻寬。其中七頻天線設計為全平面印刷並且具有良好的輻射特性，面積僅為24.5 x 10 mm2。一開始提出將饋入端及短路端的位置經由適當設計，兩者大致遠離至對角線的位置，可將環圈天線的部份電流共振路徑整合至接地面相對應之邊緣上，使得環圈天線的路徑長度約僅為一般環圈天線的一半。接著藉由加入寄生單極結構以及形塑系統電路板來增加環圈天線之操作頻寬，其中形塑系統電路板不僅可用來整合電池元件至同一平面以降低手機厚度，亦可使得接地面表面電流分佈更加集中，大幅增加低頻的操作頻寬。除了分析天線的遠場特性之外，近場效應為實際應用時將面臨到的問題，因此，針對人體頭部與手部對天線輻射特性所造成的影響作分析，以及本天線設計之SAR與HAC值進行模擬和研究，討論其生物相容性議題。

In this thesis, two types of handset antenna design respectively for dual-band GSM850/1900 operation and seven–band LTE/WWAN operation are presented. The proposed antennas can achieve decreased antenna size and enhanced operating bandwidth by shaping the system ground plane of the handset. The seven-band LTE/WWAN antenna is printed on the system circuit board with good radiation characteristics and occupies a small size of 24.5 x 10 mm2. At first, we propose a half-loop antenna structure which integrates its facing edge of the system ground plane as the resonant path of the antenna. In this case, the required length of the half-loop antenna structure is only about a half compared with the traditional loop antenna. Next, to enhance the operating bandwidth of the antenna, a parasitic shorted monopole strip is added and a shaped system circuit board is used. The shaped system circuit board can integrate the battery with the circuit board to help reduce the thickness of handset. Also, much enhanced operating bandwidth for the lower band can be obtained, owing to the enhanced surface current excitation in the system ground plane resulting from properly shaping the system circuit board. Effects of the user’s head and hand on the proposed antenna are studied, and the simulated SAR and HAC results are also analyzed for bio-compatibility issue.

目錄 i
圖次 iii
表次 v
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 簡單之接地面天線應用於GSM850/1900之操作 (Simple Ground Antenna for GSM850/1900 Operation) 5
2.1 接地面天線之技術概念 5
2.2 天線結構與技術說明 7
2.3 天線模擬結果與分析 9
2.4 延伸研究 15
2.5 心得與討論 17
第三章 形塑接地面以增加接地面天線頻寬與其應用於LTE/WWWAN之操作(Shaping the Ground Plane for Bandwidth Enhancement of the Ground Antenna and its Application for LTE/WWAN Operation ) 18
3.1 形塑接地面之技術概念 19
3.2 天線結構與技術說明 20
3.3 天線實驗結果與分析 24
3.4 延伸研究 33
3.5 心得與討論 35
第四章 天線之生物相容性研究 (Study of Antenna’s Bio-compatibility) 36
4.1 SAR測試方式與規範 37
4.2 使用者頭部與手部對手機天線的影響 39
4.3 HAC測試方式與規範 45
4.4 模擬結果與分析 48
4.5 心得與討論 49
第五章 結論 (Conclusions) 50
參考文獻 (References) 53
論文著作表 (Publication List) 56

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