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Numerical Compliance Testing of Human Exposure to Electromagnetic Radiation from Smart-Watches
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- Authors
- Seon-Eui Hong, Ae-Kyoung Lee, Jong-Hwa Kwon, Jeong-Ki Pack
- Issue Date
- 2016-10
- Citation
- Physics in Medicine and Biology, v.61, no.19, pp.6975-6992
- ISSN
- 0031-9155
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Type
- Journal Article
- Abstract
- In this study, we investigated the electromagnetic dosimetry for smart-watches. At present, the standard for compliance testing of body-mounted and handheld devices specifies the use of a flat phantom to provide conservative estimates of the peak spatial-averaged specific absorption rate (SAR). This means that the estimated SAR using a flat phantom should be higher than the SAR in the exposure part of an anatomical human-body model. To verify this, we numerically calculated the SAR for a flat phantom and compared it with the numerical calculation of the SAR for four anatomical human-body models of different ages. The numerical analysis was performed using the finite difference time domain method (FDTD). The smart-watch models were used in the three antennas: the shorted planar inverted-F antenna (PIFA), loop antenna, and monopole antenna. Numerical smart-watch models were implemented for cellular commutation and wireless local-area network operation at 835, 1850, and 2450 MHz. The peak spatial-averaged SARs of the smart-watch models are calculated for the flat phantom and anatomical human-body model for the wrist-worn and next to mouth positions. The results show that the flat phantom does not provide a consistent conservative SAR estimate. We concluded that the difference in the SAR results between an anatomical human-body model and a flat phantom can be attributed to the different phantom shapes and tissue structures.
- KSP Keywords
- Compliance Testing, Different ages, Finite-difference Time-domain(FDTD), Handheld devices, Human exposure, Inverted F antenna(IFA), Loop Antenna, Monopole antenna, Network operation, Numerical analysis, Numerical calculation