Differential Six-port Radio Transceiver for Ultra-wideband and Wideband Antennas
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Requirement for high speed wireless connectivity is propelling research in advanced communication systems. Low power and wide bandwidth of the ultra-wideband technology makes it a potential candidate for high speed data transmission. The six-port based radio systems and wideband antennas have been studied and presented in this dissertation for ultra-wideband applications.
The six-port modulator operation with carrier leakage suppression was demonstrated at a center frequency of 7.5 GHz. The six-port correlator utilizes a quarter wavelength transmission line for carrier leakage suppression, together with diodes or eld effect transistors as variable impedance terminations. Especially, a differential six-port modulator was designed and veried through simulation and measurement. The prototype shows its capability of carrier leakage suppression and high speed data transmission with 256-quadrature amplitude modulation at 50 Msymbol/s at the center frequency of 7.5 GHz. Furthermore, a differential six-port demodulator was demonstrated with the 16 quadrature amplitude modulation at a data rate of 0.8 Gbit/s at the center frequency of 7.5 GHz. It uses zero-bias anti-parallel Schottky diodes as power detectors.
Flexible antennas were designed such that they can be housed by folding it around in space limited environment with stable performance over a wide operation bandwidth. Measurement, on a exible dipole antenna with integrated balun, shows that it covers a frequency band from 6 to 11 GHz at a voltage standing wave ratio lower than 2.5 with the antenna eciency above 86%. A miniaturized monopole antenna that is not only capable of operating over an ultra-wideband but also for lower frequency bands was invented and veried. It covers a frequency range from 1.35 to 11.5 GHz. It gives a quasi-omnidirectional radiation pattern and high eciency. The antenna has a patent pending status with the United States Patent and Trademark Oce.
Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 2011. , 71 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1403
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-71837ISBN: 978-91-7393-052-9OAI: oai:DiVA.org:liu-71837DiVA: diva2:454355
2011-12-01, TP51, Tappan, Campus Norrköping, Norrköping, Norrköping, 10:00 (English)
Wu, Ke, Professor
Gong, Shaofang, Professor
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