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Title page for etd-0329104-100528


URN etd-0329104-100528 Statistics This thesis had been viewed 1959 times. Download 38 times.
Author Chieh-De Tsai
Author's Email Address jdtsai@ecomtec.com.tw
Department Communication Engineering
Year 2003 Semester 1
Degree Master Type of Document Master's Thesis
Language English Page Count 49
Title Design and Analysis of The Dual-Band Antennas for WLAN Communications
Keyword
  • WLAN
  • Rectangular Patch Antenna
  • Probe
  • Monopole Antenna
  • ISM
  • HIPERLAN
  • HIPERLAN
  • ISM
  • Monopole Antenna
  • Probe
  • Rectangular Patch Antenna
  • WLAN
  • Abstract We have investigated and analyzed the characteristics of the impedance bandwidth and radiation patterns of limited-size dual-band antennas with a small ground plane. With the development of the state-of-the-art wireless communication products, the multi-band antennas must be ones of the most important components for Wireless Local Area Networks (WLAN) applications. Thus the limited-size dual-band antennas designed and presented in this thesis are to focus on the purposes of the modern IEEE802.11a/b/g WLAN applications. At higher frequency band (5GHz), the patch antenna could only be used in part of the IEEE802.11a band. To satisfy the requirement of the IEEE802.11a standard (5150–5350 and 5470–5825MHz), the bandwidth of at least 700MHz is required. Due to the above disadvantages of the patch antenna, small-size dual-band antennas with monopole structures are designed for the IEEE802.11a/b/g WLAN applications. The ground plane is minimized to achieve the omni-directional characteristics. The simulated and measured results of the impedance bandwidth, radiation patterns, and antenna gain variation of the antennas are analyzed. All the properties of these dual-band antennas including the bandwidth, radiating patterns, and gain variation can satisfy the IEEE 802.11a/b/g specifications for WLAN applications, except the rectangular microstrip antenna operating at higher frequency band due to its nature.
    Advisor Committee
  • Chi-Fang Huang - advisor
  • I-F Chen - co-chair
  • The-Nan Chang - co-chair
  • Files indicate in-campus access only
    Date of Defense 2004-01-15 Date of Submission 2004-03-29


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