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Whole-body SAR measurements of millimeter-wave base station in reverberation chambers

Published online by Cambridge University Press:  09 May 2024

Jens Eilers Bischoff Open the ORCID record for Jens Eilers Bischoff [Opens in a new window] ,
Paramananda Joshi ,
Davide Colombi ,
Bo Xu  and
Christer Törnevik
Jens Eilers Bischoff*
Affiliation:
Ericsson Research, Ericsson AB, Stockholm, Sweden
Paramananda Joshi
Affiliation:
Ericsson Research, Ericsson AB, Stockholm, Sweden
Davide Colombi
Affiliation:
Ericsson Research, Ericsson AB, Stockholm, Sweden
Bo Xu
Affiliation:
Ericsson Research, Ericsson AB, Stockholm, Sweden
Christer Törnevik
Affiliation:
Ericsson Research, Ericsson AB, Stockholm, Sweden
*
Corresponding author: Jens Eilers Bischoff; Email: jens.eilers.bischoff@ericsson.com
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Abstract

This paper presents a method for measuring whole-body specific absorption rate (WBSAR) of millimeter-wave base stations (BSs) in a reverberation chamber (RC). The absorbed power in the phantom from the equipment under test (EUT) and hence WBSAR is determined as the difference between the total radiated power with and without the phantom. A chamber transfer function is determined and used to include only the absorption in the phantom due to direct illumination from the EUT, i.e., excluding absorption due to the RC multipath reflections. The measurement method was evaluated at 28 GHz using a horn antenna and a commercial massive multi-input–multi-output BS. The experimental results are in good agreement with simulations. The proposed method allows for measurements of WBSAR within 3 minutes, which is much shorter than traditional approaches. The method is suitable for compliance assessments of BS products with the International Commission on Non-Ionizing Radiation Protection 2020 electromagnetic field exposure guidelines, which extend the applicability of WBSAR as basic restrictions up to 300 GHz.

Keywords

5Gantenna measurementreverberation chamberwidebandwhole body specific absorption rate

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Special Issue 10: Swedish microwave days 2023 , December 2024 , pp. 1659 - 1664
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Copyright
© Ericsson AB, 2024. Published by Cambridge University Press in association with The European Microwave Association.

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References

Hill, DA (2009) Electromagnetic Fields in Cavities: Deterministic and Statistical Theories, IEEE Press Series on Electromagnetic Wave Theory, vol. 35. New York: John Wiley & Sons.Google Scholar
Andrie, G (2021) Electromagnetic Reverberation Chambers Recent Advances and Innovative Applications. London: The Institution of Engineering and Technology.Google Scholar
Furht, B and Ahson, S (2009) Long Term Evolution: 3GPP LTE Radio and Cellular Technology. New York: Taylor & Francis.Google Scholar
Wang, J, Suzuki, T, Fujiwara, O and Hariama, K (2012) Measurement and validation of GHz-band whole-body average SAR in a human volunteer using reverberation chamber. Physics in Medicine & Biology 57(23), .CrossRefGoogle Scholar
Kvarnstrand, J, Schilliger Kildal, S, Skårbratt, A and Schilliger Kildal, M (2016) Comparison of live person test to head and hand phantom test in reverberation chamber. In 10th European Conference on Antennas and Propagation (EuCAP), Davos Switzerland.Google Scholar
Gifuni, A, Adil, M, Grassini, G, Buono, A, Nunziata, F, Micheli, D and Migliaccio, M (2022) An effective method using reverberation chambers to measure TRP from mobile phones and power absorbed by user body. In IEEE Transaction on Electromagnetic Compatibility.CrossRefGoogle Scholar
Eilers Bischoff, J (2022) Whole-body SAR measurements of 5G mmW base stations in a reverberation chamber. KTH Royal Institute of Technology (Master Thesis), Sweden.Google Scholar
International Commission on Non-Ionizing Radiation Protection (ICNIRP) (2020) Guidelines for limiting exposure to electromagnetic fields (100 kHz to 300 GHz). Health Physics 118(5), 483–524.CrossRefGoogle Scholar
ICNIRP (1998) Guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields (up to 300 GHZ. Health Physics 74(4), 494–522.Google Scholar
Colombi, D, Xu, B, Anguiano Sanjurjo, D, Joshi, P, Ghasemifard, F, Di Paola, C and Törnevik, C (2022) Implications of ICNIRP 2020 exposure guidelines on the RF EMF compliance boundary of base stations. Frontiers in Communications and Networks 3, .Google Scholar
International Electrotechnical Commission (2022) Determination of RF field strength, power density and SAR in the vicinity of radiocommunications base stations for the purpose of evaluating human exposure. Standard IEC 62232 ED3.Google Scholar
3GPP (2023) 5G; NR; Base Station (BS) conformance testing Part 2: Radiated conformance testing ETSI TS 138 141-2 V17.9.0 (2023-05).Google Scholar
SPEAG LOSSY MATERIALS, Schmid & Partner Engineering AG. https://speag.swiss/components/dielectric-database/material-properties/ (accessed 16 October 2023).Google Scholar