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Hybrid Analysis of Human Exposure from Base-Station Antennas in Underground Environment
Jianqing WANG Masayuki KOMATSU Osamu FUJIWARA Shinji UEBAYASHI
Publication
IEICE TRANSACTIONS on Communications
Vol.E89-B
No.12
pp.3411-3416 Publication Date: 2006/12/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.12.3411 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Electromagnetic Compatibility(EMC) Keyword: underground environment, base station antenna, SAR, ray-tracing method, FDTD method, safety evaluation,
Full Text: PDF(833.9KB)>>
Summary:
In this study we have employed an effective technique for dosimetric analyses of base station antennas in an underground environment. The technique combines a ray-tracing method and the finite-difference time-domain (FDTD) method to calculate the specific absorption rate (SAR) in the human body. The ray-tracing method was applied to evaluate the incident fields in relation to the exposed subject in a three-dimensional space, while the FDTD method was used to calculate the detailed SAR distributions in the human body. A scenario under an underground passage with the installation of a top-loaded monopole antenna was analyzed to investigate the relationship between the actual antenna exposure and a plane-wave exposure. The results show that the plane-wave exposure overestimated the whole-body average SAR in most cases, although this was not always true for peak SAR. The finding implies not only the usefulness of the present uniform-exposure-based reference level for the whole-body average SAR evaluation but also the necessity of modeling actual underground environment for high-precision local peak SAR evaluation.
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