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Antenna bandwidth broadening with a negative impedance converter

Published online by Cambridge University Press:  03 June 2013

Oluwabunmi O. Tade ,
Peter Gardner  and
Peter S. Hall
Oluwabunmi O. Tade*
Affiliation:
School of Electronic, Electrical and Computer Engineering, University of Birmingham, Birmingham, B15 2TT, UK. Phone: +44 121 414 2934
Peter Gardner
Affiliation:
School of Electronic, Electrical and Computer Engineering, University of Birmingham, Birmingham, B15 2TT, UK. Phone: +44 121 414 2934
Peter S. Hall
Affiliation:
School of Electronic, Electrical and Computer Engineering, University of Birmingham, Birmingham, B15 2TT, UK. Phone: +44 121 414 2934
*
Corresponding author: O. O. Tade Email: oot850@bham.ac.uk
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Abstract

Cognitive radio (CR) has generated a lot of interest because of the promise of wide instantaneous bandwidths which will improve data rates. Current social trends suggest that CR nodes will ultimately be mobile and handheld. This produces a need for small wideband antennas. The Chu limit imposes a restriction on what is obtainable with passive matching. In this paper, it is shown how a negative impedance converter (NIC) can be used to broadband match a chassis antenna beyond what is obtainable with passive matching. It is also shown how to predict and overcome the instabilities which have limited the top frequency achievable with NICs. The noise and linearity performance of the NIC matched antenna is also shown.

Keywords

Circuit design and applicationsMicrowave measurements
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Special Issue 3: European Microwave Week 2012 , June 2013 , pp. 249 - 260
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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References

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