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Uncoupled antenna matching for performance optimization in compact MIMO systems using unbalanced load impedance

Tian, Ruiyuan LU and Lau, Buon Kiong LU (2008) IEEE Vehicular Technology Conference (VTC Spring 2008) In [Host publication title missing] p.299-303
Abstract
Some MIMO applications require antennas to be closely spaced, which result in mutual coupling among antennas and high spatial correlation for signals. In order to compensate for the performance degradation due to correlation and coupling, impedance matching networks may be used. Recently, it was shown that uncoupled matching networks could be optimized against a given performance metric with the constraint of similar matching impedance for all antennas, i.e., balanced matching. In this paper, we investigate the use of uncoupled matching networks with both balanced and unbalanced load impedances, where either the received power or the channel capacity is optimized. For two- and three-element dipole arrays, we show numerically that a... (More)
Some MIMO applications require antennas to be closely spaced, which result in mutual coupling among antennas and high spatial correlation for signals. In order to compensate for the performance degradation due to correlation and coupling, impedance matching networks may be used. Recently, it was shown that uncoupled matching networks could be optimized against a given performance metric with the constraint of similar matching impedance for all antennas, i.e., balanced matching. In this paper, we investigate the use of uncoupled matching networks with both balanced and unbalanced load impedances, where either the received power or the channel capacity is optimized. For two- and three-element dipole arrays, we show numerically that a significant performance improvement can be achieved by introducing unbalanced matching. Observations suggest that the achieved improvement varies with array geometry and propagation environment. For example, a large capacity gain of up to 23% is realized when matching a uniform linear array to propagation environments that are asymmetrical about the array broadside, whereas the symmetrical environments do not benefit as much from unbalanced matching. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
[Host publication title missing]
pages
5 pages
conference name
IEEE Vehicular Technology Conference (VTC Spring 2008)
external identifiers
  • WOS:000259298000062
  • Scopus:47749093595
ISSN
1550-2252
ISBN
978-1-4244-1644-8
DOI
10.1109/VETECS.2008.74
language
English
LU publication?
yes
id
744dc74d-ed05-4f22-ad38-bc3bd3bb6165 (old id 1037832)
date added to LUP
2008-11-24 15:05:35
date last changed
2016-10-13 04:26:42
@misc{744dc74d-ed05-4f22-ad38-bc3bd3bb6165,
  abstract     = {Some MIMO applications require antennas to be closely spaced, which result in mutual coupling among antennas and high spatial correlation for signals. In order to compensate for the performance degradation due to correlation and coupling, impedance matching networks may be used. Recently, it was shown that uncoupled matching networks could be optimized against a given performance metric with the constraint of similar matching impedance for all antennas, i.e., balanced matching. In this paper, we investigate the use of uncoupled matching networks with both balanced and unbalanced load impedances, where either the received power or the channel capacity is optimized. For two- and three-element dipole arrays, we show numerically that a significant performance improvement can be achieved by introducing unbalanced matching. Observations suggest that the achieved improvement varies with array geometry and propagation environment. For example, a large capacity gain of up to 23% is realized when matching a uniform linear array to propagation environments that are asymmetrical about the array broadside, whereas the symmetrical environments do not benefit as much from unbalanced matching.},
  author       = {Tian, Ruiyuan and Lau, Buon Kiong},
  isbn         = {978-1-4244-1644-8},
  issn         = {1550-2252},
  language     = {eng},
  pages        = {299--303},
  series       = {[Host publication title missing]},
  title        = {Uncoupled antenna matching for performance optimization in compact MIMO systems using unbalanced load impedance},
  url          = {http://dx.doi.org/10.1109/VETECS.2008.74},
  year         = {2008},
}