Conservative analytical assessments of localized RF exposure from small magnetic field sources
| dc.contributor.author | Rouse, Chris D. | |
| dc.date.accessioned | 2024-06-05T11:48:47Z | |
| dc.date.available | 2024-06-05T11:48:47Z | |
| dc.date.issued | 2024-04-18 | |
| dc.description.abstract | A conservative analytical framework for assessing radiofrequency (RF) exposure from small magnetic field sources near the body is presented, with an emphasis on the 3kHz to 10MHz frequency range. Worst-case exposure models are proposed and analyzed for both homogeneous and heterogeneous tissue based on source dimensions, drive current, and separation distance. Electromagnetic analysis of induced field enhancements due to tissue heterogeneity is presented. Maximum drive currents for compliance with the basic restrictions are obtained for both tissue models. In the heterogeneous case, field enhancement in thin regions of low conductivity leads to significantly lower allow- able drive levels for nerve stimulation (NS) compliance. Guidance is provided regarding how to account for such enhancements for various internal E-field calculation methods. The impact of these field enhancements on 10-g specific absorption rate (SAR) is found to be small, i.e., the homogeneous tissue assumption appears to be sufficiently conservative. A small enhancement factor may be appropriate for 1-g SAR. The benefit of assessing against the basic restrictions instead of the reference levels is also explored. This work can be leveraged by regulatory and standardization bodies to develop exemption levels for small magnetic field sources, e.g., inductive chargers, to significantly reduce compliance burdens. | |
| dc.description.copyright | © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | |
| dc.identifier.issn | 0018-9375 | |
| dc.identifier.uri | https://unbscholar.lib.unb.ca/handle/1882/37913 | |
| dc.language.iso | en | |
| dc.publisher | Institute of Electrical and Electronics Engineers (IEEE) | |
| dc.relation | Natural Sciences and Engineering Research Council of Canada | |
| dc.relation | New Brunswick Innovation Foundation | |
| dc.relation | IEEE Antennas and Propagation Society Undergraduate Student Research Scholarship | |
| dc.relation.hasversion | 10.1109/TEMC.2023.3328820 | |
| dc.rights | http://purl.org/coar/access_right/c_abf2 | |
| dc.subject.discipline | Electrical and Computer Engineering | |
| dc.title | Conservative analytical assessments of localized RF exposure from small magnetic field sources | |
| dc.type | research article | |
| oaire.citation.title | Transactions on Electromagnetic Compatibility | |
| oaire.license.condition | other | |
| oaire.version | http://purl.org/coar/version/c_ab4af688f83e57aa |
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