碩士 / 國立成功大學 / 電機工程學系專班 / 98 / 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.
| Identifer | oai:union.ndltd.org:TW/098NCKU5442015 |
| Date | January 2010 |
| Creators | Hung-ChiChang, 張竑琦 |
| Contributors | Wen-Hsi Lee, 李文熙 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 61 |
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