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Title page for etd-0714105-201249


URN etd-0714105-201249 Statistics This thesis had been viewed 1717 times. Download 19 times.
Author Shih-Wei Lin
Author's Email Address No Public.
Department Communication Engineering
Year 2004 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 47
Title NEW WAY TO EXCITE A QUADRATURE ELECTROMAGNETIC ANTENNA (QUAD-EMC) WITH WIDE-BAND GOOD AXIAL RATIO
Keyword
  • QUAD-EMC
  • CP
  • CP
  • QUAD-EMC
  • Abstract In this paper, techniques to generate circularly polarized waves from a QUAD-EMC unit are investigated. Three feed configurations were investigated. One of them is to offset-feed it by an open rectangular ring with a circumference around four wavelengths. It has been shown that both 3-dB axial ratio and 10-dB return loss bandwidths can be achieved up to 11%. The array contains a volume of 50x50x3.2 mm3, taking account of an enlarged ground plane. It has a highest gain of 9 dBic at 5.8 GHz with an efficiency of 70%.
    The potential application of the present antenna may be used in a Wireless LAN centered at 5.5GHz band. It covers a frequency range from 5.15 to 5.825 GHz. Therefore, 10% bandwidth is required. The present antenna not only provides this wide bandwidth but also generates a circular polarized wave. The latter one may further improve the reception ability.
    Advisor Committee
  • none - advisor
  • Po-Wen Hsu - co-chair
  • Shih-Chieh Chao - co-chair
  • Files indicate in-campus access only
    Date of Defense 2005-06-24 Date of Submission 2005-07-14


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