| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 92 === In this thesis, our main objective subject is to discuss and analyze the PIFA in wireless LAN(WLAN) application. The designed structures for dual band, broad band and triple band operations are based on the conventional PIFA. A dual band structures is designed by utilizing a U-shape metal sheet with an the etched aperture in the central region of the conventional PIFA, with shorting pins at the edge to achieve the dual operating frequencies of 2.45GHz and 5.8GHz. The impedance bandwidth is respectively, 7.3% and 2.9% at the lower and upper frequencies. For the broadband operation, a rectangular annular metal sheet surrounding the conventional PIFA radiating conducting is implemented. The annular conductor would induce two modes in close vicinity to each other. The overlapping of these two modes enabled operation at wider bandwidth. With this design, the measured impedance bandwidth has been extended to 26.1%. It means that the entire 5GHz WLAN will be covered by the proposed design. Finally we also implemented triple band structure by mode coupling of three metal sheets in which radiation can be achieved at 2.45GHz、5.2GHz and 5.8GHz, with impedance bandwidth of 7.2% at low frequency 2.45GHz, and 17.8% at higher frequencies of 5.2GHz and 5.8GHz.
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