下載電子全文宣告This thesis is authorized to indicate in-campus access only
You can not download at the moment.
Your IP address is 22.214.171.124
The defense date of the thesis is 2004-07-28
The current date is 2018-02-23
This thesis will be accessible at off-campus not accessible
URN etd-0728104-145619 Statistics This thesis had been viewed 4069 times. Download 1451 times. Author Hong-Ru SuChen Author's Email Address email@example.com Department Communication Engineering Year 2003 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 48 Title REFLECTARRAY ANTENNA USING QUAD-EMC ELEMENTS Keyword reflectarry antenna array antenna antenna antenna array antenna reflectarry antenna Abstract ABSTRACT
This thesis demonstrates a new concept of reflectarray based on a quad-EMC patch as radiating element. The advantages of using the proposed radiating element are (1) bandwidth improvement (2) possibility of avoiding bends in stubs to reduce the cross polarization level (3) the phase adjustment is made at a sub-array level so that the number of phase shifters can be reduced.
Several prototypes have been designed, manufactured and tested. For example, in one of the design, a 30% 3-dB gain bandwidth can be achieved. The efficiency is around 25%. Generally speaking, the wide band operation of the proposed design is proved. The straight delay lines employed as the phase shifters employed here will logically be true to generate lower cross-polarization. However, the experimental observations show a frequency dependence on cross-polarization levels. At some frequencies, the cross polarization level is still high. The best achieved cross polarization level is around 25dB.
Advisor Committee The-Nan Chang - advisor
Chi-Fang Huang - co-chair
none - co-chair
Files Date of Defense 2004-07-20 Date of Submission 2004-07-28