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Efficient evaluation of specific absorption rate (SAR) for MIMO terminals

Li, Hui LU and Lau, Buon Kiong LU (2014) In Electronics Letters 50(22). p.1561-1562
Abstract
Multi-antenna enabled terminal devices are required to comply with the standards for limiting human exposure to electric fields. However, when compared to traditional single-antenna terminals, a comprehensive evaluation of specific absorption rate (SAR) for multi-antenna terminals is impractical. This is because both the power allocation and phase of the electric fields from different antennas are arbitrary in practical MIMO operation, hence requiring exhaustive evaluation over all possible cases. In this context, this paper first proposes time averaged simultaneous peak SAR (TASPS) as an efficient metric to evaluate exposure when more than one antenna is transmitting simultaneously. Then, it is analytically derived that TASPS will be... (More)
Multi-antenna enabled terminal devices are required to comply with the standards for limiting human exposure to electric fields. However, when compared to traditional single-antenna terminals, a comprehensive evaluation of specific absorption rate (SAR) for multi-antenna terminals is impractical. This is because both the power allocation and phase of the electric fields from different antennas are arbitrary in practical MIMO operation, hence requiring exhaustive evaluation over all possible cases. In this context, this paper first proposes time averaged simultaneous peak SAR (TASPS) as an efficient metric to evaluate exposure when more than one antenna is transmitting simultaneously. Then, it is analytically derived that TASPS will be below a given exposure limit, as long as the stand-alone peak SAR for each antenna is smaller than that limit. Thus, SAR evaluation is greatly simplified since only stand-alone SAR needs to be measured. Several examples of dual-antenna mobile handsets are shown to illustrate and validate the analytical result. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Electronics Letters
volume
50
issue
22
pages
1561 - 1562
publisher
IEE
external identifiers
  • wos:000344319700002
  • scopus:84908124470
ISSN
1350-911X
DOI
10.1049/el.2014.2125
project
EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications
language
English
LU publication?
yes
id
419ea2e4-1bf1-498f-8bd9-19dac4ed5e76 (old id 4694466)
alternative location
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6937294
date added to LUP
2014-10-06 11:44:33
date last changed
2017-03-13 11:03:06
@article{419ea2e4-1bf1-498f-8bd9-19dac4ed5e76,
  abstract     = {Multi-antenna enabled terminal devices are required to comply with the standards for limiting human exposure to electric fields. However, when compared to traditional single-antenna terminals, a comprehensive evaluation of specific absorption rate (SAR) for multi-antenna terminals is impractical. This is because both the power allocation and phase of the electric fields from different antennas are arbitrary in practical MIMO operation, hence requiring exhaustive evaluation over all possible cases. In this context, this paper first proposes time averaged simultaneous peak SAR (TASPS) as an efficient metric to evaluate exposure when more than one antenna is transmitting simultaneously. Then, it is analytically derived that TASPS will be below a given exposure limit, as long as the stand-alone peak SAR for each antenna is smaller than that limit. Thus, SAR evaluation is greatly simplified since only stand-alone SAR needs to be measured. Several examples of dual-antenna mobile handsets are shown to illustrate and validate the analytical result.},
  author       = {Li, Hui and Lau, Buon Kiong},
  issn         = {1350-911X},
  language     = {eng},
  number       = {22},
  pages        = {1561--1562},
  publisher    = {IEE},
  series       = {Electronics Letters},
  title        = {Efficient evaluation of specific absorption rate (SAR) for MIMO terminals},
  url          = {http://dx.doi.org/10.1049/el.2014.2125},
  volume       = {50},
  year         = {2014},
}