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Analysis and estimation of MIMO-SAR for multi-antenna mobile handsets

Li, Hui LU ; Tsiaras, Apostolos and Lau, Buon Kiong LU (2017) In IEEE Transactions on Antennas and Propagation1963-01-01+01:00 p.1522-1527
Abstract
Measuring MIMO-SAR is an important part of mobile handset evaluation, following the introduction of uplink MIMO transmission schemes in LTE-Advanced. However, the measurement of MIMO-SAR is complex and time-consuming. In this paper, 6 unique dual-antenna mobile handsets, including both typical and novel designs, are analyzed to determine the dependence of MIMO-SAR on antenna configuration and correlation. It is found that, for certain antenna configurations, the location of the maximum MIMO-SAR and the corresponding relative phase between the ports can be predicted. This can be applied to drastically reduce measurement time. In addition, dual-antennas with low envelope correlation coefficients in the radiation patterns also offer... (More)
Measuring MIMO-SAR is an important part of mobile handset evaluation, following the introduction of uplink MIMO transmission schemes in LTE-Advanced. However, the measurement of MIMO-SAR is complex and time-consuming. In this paper, 6 unique dual-antenna mobile handsets, including both typical and novel designs, are analyzed to determine the dependence of MIMO-SAR on antenna configuration and correlation. It is found that, for certain antenna configurations, the location of the maximum MIMO-SAR and the corresponding relative phase between the ports can be predicted. This can be applied to drastically reduce measurement time. In addition, dual-antennas with low envelope correlation coefficients in the radiation patterns also offer near-orthogonal electric near-fields. This leads to smaller MIMO-SAR than stand-alone SAR (S-SAR) over all relative phases, making MIMO-SAR measurement unnecessary. The results also provide guidelines for designing multi-antenna handsets with low SARs. For verification, the S- SAR and MIMO-SAR at relative phase of 0° were measured for several handsets. The measured SAR distributions showed good agreement with the simulated ones. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
SAR, MIMO systems, wireless communications
in
IEEE Transactions on Antennas and Propagation1963-01-01+01:00
pages
1522 - 1527
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85015223081
  • wos:000396097500065
ISSN
0018-926X
DOI
10.1109/TAP.2016.2647708
language
English
LU publication?
yes
id
d43a25d8-c139-482c-9e7b-f90e48333cee
date added to LUP
2016-12-24 17:10:34
date last changed
2018-01-07 11:42:37
@article{d43a25d8-c139-482c-9e7b-f90e48333cee,
  abstract     = {Measuring MIMO-SAR is an important part of mobile handset evaluation, following the introduction of uplink MIMO transmission schemes in LTE-Advanced. However, the measurement of MIMO-SAR is complex and time-consuming. In this paper, 6 unique dual-antenna mobile handsets, including both typical and novel designs, are analyzed to determine the dependence of MIMO-SAR on antenna configuration and correlation. It is found that, for certain antenna configurations, the location of the maximum MIMO-SAR and the corresponding relative phase between the ports can be predicted. This can be applied to drastically reduce measurement time. In addition, dual-antennas with low envelope correlation coefficients in the radiation patterns also offer near-orthogonal electric near-fields. This leads to smaller MIMO-SAR than stand-alone SAR (S-SAR) over all relative phases, making MIMO-SAR measurement unnecessary. The results also provide guidelines for designing multi-antenna handsets with low SARs. For verification, the S- SAR and MIMO-SAR at relative phase of 0° were measured for several handsets. The measured SAR distributions showed good agreement with the simulated ones.},
  author       = {Li, Hui and Tsiaras, Apostolos and Lau, Buon Kiong},
  issn         = {0018-926X},
  keyword      = {SAR, MIMO systems, wireless communications},
  language     = {eng},
  pages        = {1522--1527},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Antennas and Propagation1963-01-01+01:00},
  title        = {Analysis and estimation of MIMO-SAR for multi-antenna mobile handsets},
  url          = {http://dx.doi.org/10.1109/TAP.2016.2647708},
  year         = {2017},
}