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The defense date of the thesis is 2005-07-14
The current date is 2018-02-23
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URN etd-0714105-201249 Statistics This thesis had been viewed 1891 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 Date of Defense 2005-06-24 Date of Submission 2005-07-14