Antenna/Body Coupling in the Near-Field at 60 GHz: Impact on the Absorbed Power Density
Source abstract
Abstract
Wireless devices, such as smartphones, tablets, and laptops, are intended to be used in the vicinity of the human body. When an antenna is placed close to a lossy medium, near-field interactions may modify the electromagnetic field distribution. Here, we analyze analytically and numerically the impact of antenna/human body interactions on the transmitted power density (TPD) at 60 GHz using a skin-equivalent model. To this end, several scenarios of increasing complexity are considered: plane-wave illumination, equivalent source, and patch antenna arrays. Our results demonstrate that, for all considered scenarios, the presence of the body in the vicinity of a source results in an increase in the average TPD. The local TPD enhancement due to the body presence close to a patch antenna array reaches 95.5% for an adult (dry skin). The variations are higher for wet skin (up to 98.25%) and for children (up to 103.3%). Both absolute value and spatial distribution of TPD are altered by the antenna/body coupling. These results suggest that the exact distribution of TPD cannot be retrieved from measurements of the incident power density in free-space in absence of the body. Therefore, for accurate measurements of the absorbed and epithelial power density (metrics used as the main dosimetric quantities at frequencies > 6 GHz), it is important to perform measurements under conditions where the wireless device under test is perturbed in the same way as by the presence of the human body in realistic use case scenarios.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Wireless Body Area Networks · Electromagnetic Fields and Biological Effects · Antenna Design and Analysis
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Affiliations
IETR (Institut d’Électronique et des Technologies du Numérique), French National Center for Scientific Research (CNRS), University of Rennes-UMR 6164, F-35000 Rennes, France
References (31)
Show source-provided references
1. Millimeter-wave access and backhauling: The solution to the exponential data traffic increase in 5G mobile communications systems?10.1109/MCOM.2014.6894457 ↗
2. IEEE 802.15.3c: The first IEEE wireless standard for data rates over 1 Gb/s10.1109/MCOM.2011.5936164 ↗
3. Faster than fiber: The future of multi-G/s wireless10.1109/MMM.2009.932081 ↗
4. (2020, September 14). Beyond 2020 Heterogeneous Wireless Network with Millimeter Wave Small Cell Access and Backhauling | MiWaveS Project | FP7 | CORDIS | European Commission. Available online: https://cordis.europa.eu/project/id/619563/fr.
5. Frascolla, V., Faerber, M., Dussopt, L., Calvanese-Strinati, E., Sauleau, R., Kotzsch, V., Romano, G., Ranta-Aho, K., Putkonen, J., and Valino, J. (2014, January 8–12). Challenges and opportunities for millimeter-wave mobile access standardisation. Proceedings of the 2014 IEEE Globecom Workshops (GC Wkshps), Austin, TX, USA.10.1109/GLOCOMW.2014.7063490 ↗
6. (2020). International Commission on Non-Ionizing Radiation Protection (ICNIRP)1 Guidelines for Limiting Exposure to Electromagnetic Fields (100 kHz to 300 GHz). Health Phys., 118, 483–524.10.1097/HP.0000000000001210 ↗
7. (2019, January 22). IEEE Standard for Safety Levels with Respect to Human Exposure to Electric, Magnetic, and Electromagnetic Fields, 0 Hz to 300 GHz. Proceedings of the IEEE Std C95.1-2019 (Revision of IEEE Std C95.1-2005/ Incorporates IEEE StdC95.1-2019/Cor 1-2019), Piscataway, NJ, USA.
8. Millimeter-wave interactions with the human body: State of knowledge and recent advances10.1017/S1759078711000122 ↗
9. Zhadobov, M., Sauleau, R., Le Drean, Y., Alekseev, S.I., and Ziskin, M.C. (2008, January 15–19). Numerical and experimental approaches to millimeter-wave dosimetry for in vitro experiments. Proceedings of the 2008 33rd International Conference on Infrared, Millimeter and Terahertz Waves, Pasadena, CA, USA.10.1109/ICIMW.2008.4665728 ↗
10. Characterization of the Interactions Between a 60-GHz Antenna and the Human Body in an Off-Body Scenario10.1109/TAP.2012.2211326 ↗
11. Zhadobov, M., Guraliuc, A., Chahat, N., and Sauleau, R. (2014, January 8–10). Tissue-equivalent phantoms in the 60-GHz band and their application to the body-centric propagation studies. Proceedings of the 2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio2014), London, UK.10.1109/IMWS-BIO.2014.7032417 ↗
12. Total Field Reconstruction in the Near Field Using Pseudo-Vector E-Field Measurements10.1109/TEMC.2018.2837897 ↗
13. Noren, P., Foged, L.J., Scialacqua, L., and Scannavini, A. (2018, January 3–6). Measurement and Diagnostics of Millimeter Waves 5G Enabled Devices. Proceedings of the 2018 IEEE Conference on Antenna Measurements & Applications (CAMA), Vasteras, Sweden.10.1109/CAMA.2018.8530472 ↗
14. Nesterova, M., and Nicol, S. (2018, January 9–13). Analytical Study of 5G Beamforming in the Reactive Near-Field Zone. Proceedings of the 12th European Conference on Antennas and Propagation (EuCAP 2018), London, UK.10.1049/cp.2018.1086 ↗
15. Derat, B., Cozza, A., and Bolomey, J.-C. (2007, January 24–28). Influence of source-phantom multiple interactions on the field transmitted in a flat phantom. Proceedings of the 2007 18th International Zurich Symposium on Electromagnetic Compatibility, Munich, Germany.10.1109/EMCZUR.2007.4388215 ↗
16. Derat, B., and Cozza, A. (2007, January 11–16). Analysis of the transmitted field amplitude and SAR modification due to mobile terminal flat phantom multiple interactions. Proceedings of the 2nd European Conference on Antennas and Propagation (EuCAP 2007), Edinburgh, UK.10.1049/ic.2007.1309 ↗
17. Skin Temperature Elevation for Incident Power Densities From Dipole Arrays at 28 Ghz10.1109/ACCESS.2020.2970219 ↗
18. Near-Field User Exposure in Forthcoming 5G Scenarios in the 60 GHz Band10.1109/TAP.2017.2754473 ↗
19. RF Energy Absorption by Biological Tissues in Close Proximity to Millimeter-Wave 5G Wireless Equipment10.1109/ACCESS.2018.2790038 ↗
20. Guraliuc, A.R., Zhadobov, M., Chahat, N., Sauleau, R., and Leduc, C. (2016). Antenna/human body interactions in the 60 GHz band: State of knowledge and recent advances. Advances in Body-Centric Wireless Communication: Applications and State-of-the-Art, Institution of Engineering and Technology.10.1049/PBTE065E_ch5 ↗
21. Broadband Tissue-Equivalent Phantom for BAN Applications at Millimeter Waves10.1109/TMTT.2012.2195196 ↗
22. Guraliuc, A., Zhadobov, M., Sauleau, R., Marnat, L., and Dussopt, L. (July, January 29). Millimeter-wave electromagnetic field exposure from mobile terminals. Proceedings of the 2015 European Conference on Networks and Communications (EuCNC), Paris, France.10.1109/EuCNC.2015.7194045 ↗
23. The dielectric properties of biological tissues: II. Measurements in the frequency range 10 Hz to 20 GHz10.1088/0031-9155/41/11/002 ↗
24. Impact of Antenna Topology and Feeding Technique on Coupling With Human Body: Application to 60-GHz Antenna Arrays10.1109/TAP.2017.2700879 ↗
25. Pozar, D.M. (2012). Microwave Engineering, Wiley. [4th ed.].
26. On the Dispersive Nature of the Power Dissipated Into a Lossy Half-Space Close to a Radiating Source10.1109/TAP.2009.2027143 ↗
27. Scott, C. (1989). The Spectral Domain Method in Electromagnetics, Artech House.
28. Gregson, S., McCormick, J., and Parini, C. (2007). Principles of Planar Near-Field Antenna Measurements, IET. The Institution of Engineering and Technology, Michael Faraday House, Six Hills Way.10.1049/PBEW053E ↗
29. Sacco, G., Pisa, S., and Zhadobov, M. (2020). Age-dependence of electromagnetic power and heat deposition in near-surface tissues in emerging 5G bands. Sci. Rep., submitted.10.1038/s41598-021-82458-z ↗
30. Balanis, C.A. (2016). Antenna Theory: Analysis and Design, Wiley. [4th ed.].
31. Hislop, P.D., and Sigal, I.M. (1996). Introduction to Spectral Theory, Springer.10.1007/978-1-4612-0741-2 ↗