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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
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 6
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Copyright
© Ericsson AB, 2024. Published by Cambridge University Press in association with The European Microwave Association.

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