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The defense date of the thesis is 2005-07-15
The current date is 2019-03-21
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URN etd-0715105-170650 Statistics This thesis had been viewed 2671 times. Download 223 times. Author Jyun-Wei Huang 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 69 Title CIRCULARLY POLARIZED REFLECTARRAY Keyword Ring CIRCULARLY POLARIZED CIRCULARLY POLARIZED Ring Abstract This thesis studies a circularly polarized reflectarray based on a microstrip ring patch as a radiating element. Using microstrip rings for broadband performance combined with variable rotation to achieve the proper phasing between the elements. The ring antennas also have potential advantages of compact size and broader circularly polarized (CP) bandwidth as compared to the patches.
In experiments, we build and test two arrays-one is a right-hand circularly polarized array and the other one is a left hand polarization. They are all in a round shape with an 18cm diameter. Both arrays use 137 printed microstrip ring elements of variable rotations to achieve cophasal far-field radiation and wide-band performance at a focal length of 20 cm. The arrays were etched on FR4 substrate with =4.4 and 0.8-mm thickness. At 10 GHz, both antennas can achieve efficiency greater than 38% with maximum gain at broadside greater than 21.2 dB.
Advisor Committee The-Nan Chang - advisor
none - co-chair
none - co-chair
Files Date of Defense 2005-07-01 Date of Submission 2005-07-15