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The defense date of the thesis is 2006-06-26
The current date is 2017-11-21
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URN etd-0626106-201012 Statistics This thesis had been viewed 1669 times. Download 17 times. Author Chun-Sung Chu Author's Email Address email@example.com Department Communication Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 50 Title CROSS-POLARIZATION SUPPRESSION FOR A REFLECTARRAY WITH GAPPED-RING ELEMENTS Keyword WGA reflcetarray gapped-ring element gapped-ring element reflcetarray WGA Abstract In this thesis, we design linearly polarized reflectarrays with variable size-gapped-ring elements operating in X-band. Each array takes on an area of 0.24*0.24m2 which contains 256 elements etched on a 0.8mm thickness FR4 substrate. The gapped ring element is obtained by cutting a complete ring into two halves. On contrast to reflectarrays with complete ring elements, we found that co-polarization level of the two kinds of arrays is almost of the same level; however, it is apparent that cross polarization level can largely be reduced in favor to reflectarrays with gapped-ring elements. In experiments, reduction in cross polarization levels is around 11 dB.
In simulation, plane wave scattering fields of a single gapped-ring and a single complete ring element are compared. We found that scattering field for the gapped ring causes a difference-like pattern with a null field at the broadside angle. Therefore, cross polarization level can be reduced
Advisor Committee The-Nan Chang - advisor
Chien-Lun Hung - co-chair
Fu-Lai Chu - co-chair
Files Date of Defense 2006-06-23 Date of Submission 2006-06-26