SA and SAR Analysis for Wearable UWB Body Area Applications

Qiong WANG  Jianqing WANG 

Publication
IEICE TRANSACTIONS on Communications  Vol.E92-B  No.2  pp.425-430
Publication Date: 2009/02/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Medical Information and Communications Technologies)
Category: 
Keyword: 
ultra wide band (UWB),  specific energy absorption (SA),  specific absorption rate (SAR),  frequency-dependent finite difference time domain (FDTD) method, 

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Summary: 
With the rapid progress of electronic and information technology, an expectation for the realization of body area network (BAN) by means of ultra wide band (UWB) techniques has risen. Although the signal from a single UWB device is very low, the energy absorption may increase significantly when many UWB devices are simultaneously adorned to a human body. An analysis method is therefore required from the point of view of biological safety evaluation. In this study, two approaches, one is in the time domain and the other is in the frequency domain, are proposed for the specific energy absorption (SA) and the specific absorption rate (SAR) calculation. It is shown that the two approaches have the same accuracy but the time-domain approach is more straightforward in the numerical analysis. By using the time-domain approach, SA and SAR calculation results are given for multiple UWB pulse exposure to an anatomical human body model under the Federal Communications Commission (FCC) UWB limit.