Multi-band Miniature Antenna Design

碩士 === 國立中正大學 === 電機工程所 === 95 === Among the most common used antennas in the portable mobile devices, the planer micro-stripe antenna is the most popular one of which is small size, light in weight, easy fabrication, low cost and high reliability and especially its easy compatibility with printed c...

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Bibliographic Details
Main Authors: Zhi-Xiang Zhuang, 莊志祥
Other Authors: Janne-Wha Wu
Format: Others
Language:en_US
Published: 2007
Online Access:http://ndltd.ncl.edu.tw/handle/84048300266095672080
Description
Summary:碩士 === 國立中正大學 === 電機工程所 === 95 === Among the most common used antennas in the portable mobile devices, the planer micro-stripe antenna is the most popular one of which is small size, light in weight, easy fabrication, low cost and high reliability and especially its easy compatibility with printed circuit board. So it plays an important role in handset communication. In this thesis, one of rectangular monopole micro-stripe antenna was used as the basis for study. Three inverted F-shaped antenna (PIFA) structures were studied for the minimization of multiple-band applications. First, both approaches of rectangular and circular spiral deformed structures were employed to minimize the antenna size and generate a dual pass-band antenna. The variations of feature size and material parameters suffered from the manufacture of the printed circuit board were investigated, too. The possibility of enlarging the operating bandwidth on the PIFA antenna was evaluated by adding one chip resistor in serial. Finally, an extra stub was appended onto the deformed rectangular spiral PIFA antenna. By this way, the flexibility of operating frequency could be easily expanded from dual bands to triple bands. All of the structures had been verified with measurement. The experimental results reveal that the desired operating frequency could be easily achieved. As compared to the traditional planar inverted F-shape antenna, such kind of deformed ones take less area on the printed circuit board. One of important figure is their radiation field pattern being omni-directional. Keywords: micro-strip antenna, PIFA, handset communication, omni-directional