Maximum Average SAR Measurement Procedure for Multi-Antenna Transmitters

Takahiro IYAMA  Teruo ONISHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.7   pp.1821-1825
Publication Date: 2010/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1821
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'09/Kyoto)
Category: Biological Effects and Safety
Keyword: 
specific absorption rate (SAR),  multi-antenna,  electro-optic (EO) probe,  equivalent theorem,  image theory,  

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Summary: 
This paper proposes and verifies a specific absorption rate (SAR) measurement procedure for multi-antenna transmitters that requires measurement of two-dimensional electric field distributions for the number of antennas and calculation in order to obtain the three-dimensional SAR distributions for arbitrary weighting coefficients of the antennas prior to determining the average SAR. The proposed procedure is verified based on Finite-Difference Time-Domain (FDTD) calculation and measurement using electro-optic (EO) probes. For two reference dipoles, the differences in the 10 g SAR obtained based on the proposed procedure compared numerically and experimentally to that based on the original calculated three-dimensional SAR distribution are at most 4.8% and 3.6%, respectively, at 1950 MHz. At 3500 MHz, this difference is at most 5.2% in the numerical verification.