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Impact of matching network on bandwidth of compact antenna arrays

Lau, Buon Kiong LU ; Bach Andersen, Jørgen; Kristensson, Gerhard LU and Molisch, Andreas LU (2006) In IEEE Transactions on Antennas and Propagation1963-01-01+01:00 54(11). p.3225-3238
Abstract
We analyze the impact of the matching network on compact multiple-input multiple-output systems. Existing studies have found that the matching network has a significant influence on the performance of multiple antenna systems when the antennas are in close proximity. However, none has examined the wide-band case. In this paper, we investigate the wide-band performance of four different matching networks for multiple dipole antennas. The performance of the matching networks is given in terms of the bandwidths of correlation and matching efficiency, which are extensions of the single-antenna concept of bandwidth to multiple antenna systems. We also investigate the impact of the propagation conditions on the matching and bandwidth. For a... (More)
We analyze the impact of the matching network on compact multiple-input multiple-output systems. Existing studies have found that the matching network has a significant influence on the performance of multiple antenna systems when the antennas are in close proximity. However, none has examined the wide-band case. In this paper, we investigate the wide-band performance of four different matching networks for multiple dipole antennas. The performance of the matching networks is given in terms of the bandwidths of correlation and matching efficiency, which are extensions of the single-antenna concept of bandwidth to multiple antenna systems. We also investigate the impact of the propagation conditions on the matching and bandwidth. For a uniform two-dimensional (2-D) angular power spectrum, we find that while individual-port matching can achieve in excess of 3% fractional correlation bandwidth for envelope correlation of 0.5 at an antenna separation of 0.01 lambda, multiport matching is required for efficiency bandwidth to exist for a return loss of -6 dB. Moreover, even with multiport matching, both correlation and efficiency bandwidths decrease drastically at small antenna separations. At 0.01 lambda, the correlation and efficiency bandwidths are 0.4% and 0.2%, respectively. Similar evaluations were performed for measured outdoor-to-indoor channels with moderate to small 2-D angular spreads. We find that the efficiency advantage of multiport matching over individual-port matching diminishes with decreasing angular spread. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
impedance matching, mutual coupling, correlation, antenna arrays, antenna efficiency
in
IEEE Transactions on Antennas and Propagation1963-01-01+01:00
volume
54
issue
11
pages
3225 - 3238
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000241965800021
  • scopus:84873421929
ISSN
0018-926X
DOI
10.1109/TAP.2006.883984
language
English
LU publication?
yes
id
87e684ac-6201-4028-a017-6efb6899f6bd (old id 377064)
date added to LUP
2007-10-08 12:57:07
date last changed
2018-11-21 20:43:07
@article{87e684ac-6201-4028-a017-6efb6899f6bd,
  abstract     = {We analyze the impact of the matching network on compact multiple-input multiple-output systems. Existing studies have found that the matching network has a significant influence on the performance of multiple antenna systems when the antennas are in close proximity. However, none has examined the wide-band case. In this paper, we investigate the wide-band performance of four different matching networks for multiple dipole antennas. The performance of the matching networks is given in terms of the bandwidths of correlation and matching efficiency, which are extensions of the single-antenna concept of bandwidth to multiple antenna systems. We also investigate the impact of the propagation conditions on the matching and bandwidth. For a uniform two-dimensional (2-D) angular power spectrum, we find that while individual-port matching can achieve in excess of 3% fractional correlation bandwidth for envelope correlation of 0.5 at an antenna separation of 0.01 lambda, multiport matching is required for efficiency bandwidth to exist for a return loss of -6 dB. Moreover, even with multiport matching, both correlation and efficiency bandwidths decrease drastically at small antenna separations. At 0.01 lambda, the correlation and efficiency bandwidths are 0.4% and 0.2%, respectively. Similar evaluations were performed for measured outdoor-to-indoor channels with moderate to small 2-D angular spreads. We find that the efficiency advantage of multiport matching over individual-port matching diminishes with decreasing angular spread.},
  author       = {Lau, Buon Kiong and Bach Andersen, Jørgen and Kristensson, Gerhard and Molisch, Andreas},
  issn         = {0018-926X},
  keyword      = {impedance matching,mutual coupling,correlation,antenna arrays,antenna efficiency},
  language     = {eng},
  number       = {11},
  pages        = {3225--3238},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Antennas and Propagation1963-01-01+01:00},
  title        = {Impact of matching network on bandwidth of compact antenna arrays},
  url          = {http://dx.doi.org/10.1109/TAP.2006.883984},
  volume       = {54},
  year         = {2006},
}