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Differential Six-Port Demodulator
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
2011 (English)In: Proceedings on International Conference on Wireless Communications and Signal Processing, 2011Conference paper, Published paper (Other academic)
Abstract [en]

A differential six-port demodulator for the 7-8 GHz band is reported for the first time. It is composed of a differential six-port correlator on the two sides of the substrate and zero-bias antiparallel Schottky diodes acting as power detectors. It is theoretically analyzed and also simulated. A prototype has been fabricated and data transmission at 0.8 Gbit/s (but not the maximum) with the 16 quadrature amplitude modulation (QAM) is experimentally demonstrated.

Place, publisher, year, edition, pages
2011.
Keyword [en]
differential; six-port; direct conversion demodulator; antiparallel diode pair
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-71834OAI: oai:DiVA.org:liu-71834DiVA: diva2:454323
Conference
International Conference on Wireless Communications and Signal Processing (WSPS2011), 9-11 November, Nanjing, China
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2011-11-07Bibliographically approved
In thesis
1. Differential Six-port Radio Transceiver for Ultra-wideband and Wideband Antennas
Open this publication in new window or tab >>Differential Six-port Radio Transceiver for Ultra-wideband and Wideband Antennas
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

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.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1403
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-71837 (URN)978-91-7393-052-9 (ISBN)
Public defence
2011-12-01, TP51, Tappan, Campus Norrköping, Norrköping, Norrköping, 10:00 (English)
Opponent
Supervisors
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2011-11-07Bibliographically approved

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Owais, OwaisÖsth, JoakimGong, Shaofang

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