本論文提出三種內藏式多頻天線設計結構，適合應用於現今可攜式導航通訊裝置(Portable Navigation Device，PND)當中，在符合業界需求前提下，本論文天線設計以業界規格要求，於操作頻帶內其輻射效率達到40%以上為設計目標。內容將分別詳細探討此三種結構天線的設計原理與現象分析。在第二章中，我們使用單極天線設計概念，使用雙路徑架構並於末端耦合來對天線阻抗做匹配，產生涵蓋GSM900/DCS/PCS/UMTS四頻操作頻帶，並提高與接地面的輻射高度，以避免電容效應，使天線具有良好的輻射特性; 在第三章中，使用倒F形天線設計概念，使用雙路徑架構於末端耦合，並於輻射臂上採取適當接地點電感效應作輸入阻抗匹配，達成涵蓋GSM900/DCS/PCS/UMTS系統的四個操作頻帶; 在第四章中，採用倒F形架構並使用耦合饋入方式，使得長輻射金屬臂在低頻900 MHz附近產生共振，產生低頻基頻模態及高階模態，以達成寬頻及頻寬涵蓋GSM900/DCS/PCS/UMTS頻帶操作，並有效縮減使用體積; 最後，分別比較此三種架構的優缺點，再加以業界角度來思考，研發產品天線的流程及思考方向，以及天線應用於可攜式導航裝置中未來的展望作為本論文的總結。

In this thesis, the design mainly focuses on the portable navigation device (PND) of signal receiving multi-band antenna, which is embedded into PND. In the industry, many customers require that the antenna radiation efficiency must achieve more than 40%, which become our target to develop GSM/GPRS antennas in this thesis. Three kinds of GSM/GPRS antennas design are presented and discussed in our studies. These antennas can cover GSM900/DCS/PCS/UMTS operation. In the chapter 2, the antenna is designed based on the concept of monopole antenna. Furthermore, the antenna structure have two radiant paths and coupled each other at tail end to do impedance matching. In addition, to raise distance between radiation plane and ground will avoid capacitative effect effectually. In the chapter 3, the antenna is designed based on the concept of planar inverted-F antenna. Furthermore, that the antenna structure have two radiant paths and coupled each other at tail end to do impedance matching is similar to chapter 2. But there is a difference in them. We can choose the short position to change input impedance at this structure. In the chapter 4, the antenna is designed based on the concept of planar inverted-F antenna which takes coupled-fed. It will produce the first mode and high-order mode near the frequency, 900MHz. The feature of this type is to reduce the volume effectually. This antenna can not only cover GSM900/DCS/PCS/UMTS operation but maintain good radiation efficiency. Finally, we will compare three antennas, and develop procedure with industrial view, and propose the prospect of the GSM/GPRS antenna in PND, as a conclusion.

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