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The defense date of the thesis is 2009-09-15
The current date is 2019-05-22
URN etd-0914109-230433 Statistics This thesis had been viewed 2088 times. Download 4 times. Author Guan-Yin Shen Author's Email Address No Public. Department Communication Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 53 Title CPW-FED WiMAX/WLAN ANTENNAS Keyword Antenna Circular polarize Coplanar Waveguide (CPW) fed Coplanar Waveguide (CPW) fed Circular polarize Antenna Abstract In this thesis, two unique approaches are respectively applied to design a CPW-fed circularly and a linearly polarized antenna. For the circularly polarized antenna, center conductor of the CPW is bended into a semi-circular shape and two ground branches of the CPW are connected together to form an open-aperture. We may consider that center conductor of the CPW is modified to form the first type and is protruded into the aperture. By keeping this aperture, the center conductor of the CPW can be modified into the second type. The second type results in the linearly polarized antenna by extending and widening the width of the center conductor of the CPW.
The CP antenna is designed and implemented for WLAN standards of 2.4 GHz and WiMAX standard of 2.5 GHz (2.5-2.69GHz). The measured 10-dB return loss bandwidth is 22.04 %( 2.22-2.77GHz), the 3dB axial ratio is 17.4% (2.35-2.8GHz), and the in-band antenna gain lies between 1~4.5 dBic. The LP antenna is designed to cover 2.5/3.5/5.5 GHz of WiMAX bands and 5.8 GHz of WLAN bands. The measured 10-dB return loss bandwidth is 44.6% (2.42-3.81GHz) and 16.33% (5.38-6.351GHz), and the in-band antenna gain is around 0.15~4.4 dBi. The latter one may further improve the reception ability.
Advisor Committee The-Nan Chang - advisor
Files Date of Defense 2009-07-24 Date of Submission 2009-09-15