Efficient evaluation of specific absorption rate (SAR) for MIMO terminals
Author
Summary, in English
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.
Department/s
Publishing year
2014
Language
English
Pages
1561-1562
Publication/Series
Electronics Letters
Volume
50
Issue
22
Full text
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Document type
Journal article (letter)
Publisher
IEE
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Status
Published
Project
- EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications
Research group
- Radio Systems
- Electromagnetic theory
ISBN/ISSN/Other
- ISSN: 1350-911X