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URN etd-0623106-135841 Statistics This thesis had been viewed 3629 times. Download 3246 times. Author Jing-Qing Zhan Author's Email Address No Public. Department Communication Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 69 Title RFID TAG ANTENNAS DESIGNED BY FRACTALS AND MANUFACTURED BY PRINTING TECHNOLOGIES Keyword RFID TAG ANTENNAS FRACTALS complex conjugate complex conjugate FRACTALS RFID TAG ANTENNAS Abstract The major purpose of this research is to design a 915MHz RFID tag antenna base on unique features of fractal geometry and complex conjugate matching concept. Fractal geometry involves a recursive generating methodology that results in contours with infinitely intricate fine structures. This geometry, which has been used to model complex objects found in nature such as clouds and coastlines, has space-filling properties that can be utilized to miniaturize antennas. In addition, the self-similarity properties of fractals make them especially suitable to design multi-band or wideband antennas.
In this thesis, we also adopt the complex conjugate matching concept from circuit theory. Through the complex conjugate matching concept, we can achieve the maximum power transfer in different impedance. Even the different RFID chip’s real part and image part impedance are not the same, we can achieve the best efficiency under complex conjugate matching design concept.
We can see those unique fractal features and complex conjugate matching concept are of great help for us to design a high efficiency RFID tag antenna in a really short period of time. We have also seen the possibility to use lithography print technology fabricating this RFID tag antenna design with possibly lowest cost on the marketplace. In the thesis also analysis the conductivity of the conductive ink and the material parameters of gloss coated art paper for the manufacturing process which adopt the printing technology. We use these parameters in the design simulation and check it if close to the measurement results.
Advisor Committee Chi-Fang Huang - advisor
none - co-chair
The-Nan Chang - co-chair
Files Date of Defense 2006-06-16 Date of Submission 2006-06-23