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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 Propagation 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
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
SAR, MIMO systems, wireless communications
in
IEEE Transactions on Antennas and Propagation
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
project
EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications
ELLIIT LU P01: 5G Wireless
language
English
LU publication?
yes
id
d43a25d8-c139-482c-9e7b-f90e48333cee
date added to LUP
2016-12-24 17:10:34
date last changed
2022-04-24 20:24:09
@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}},
  keywords     = {{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 Propagation}},
  title        = {{Analysis and estimation of MIMO-SAR for multi-antenna mobile handsets}},
  url          = {{https://lup.lub.lu.se/search/files/19638034/TAP2017_Li_et_al.pdf}},
  doi          = {{10.1109/TAP.2016.2647708}},
  year         = {{2017}},
}