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

IF 1.4 4区计算机科学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-09 DOI:10.1017/s1759078724000515

Jens Eilers Bischoff, Paramananda Joshi, Davide Colombi, Bo Xu, Christer Törnevik

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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.

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混响室中毫米波基站的全身 SAR 测量

本文介绍了一种在混响室（RC）中测量毫米波基站（BS）全身比吸收率（WBSAR）的方法。被测设备（EUT）在模体中的吸收功率以及 WBSAR 是根据有模体和无模体的总辐射功率之差确定的。室传递函数的确定和使用仅包括由于 EUT 的直接照射而在模型中产生的吸收，即不包括由于 RC 多径反射而产生的吸收。在 28 GHz 频率下，使用喇叭天线和商用大规模多输入多输出 BS 对测量方法进行了评估。实验结果与模拟结果十分吻合。所提出的方法可在 3 分钟内测量 WBSAR，比传统方法短得多。该方法适用于对 BS 产品进行符合国际非电离辐射防护委员会 2020 电磁场暴露准则的评估，该准则将 WBSAR 作为基本限制的适用范围扩展到 300 GHz。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Microwave and Wireless Technologies ENGINEERING, ELECTRICAL & ELECTRONIC-TELECOMMUNICATIONS

CiteScore

3.50

自引率

7.10%

发文量

130

审稿时长

6-12 weeks

期刊介绍： The prime objective of the International Journal of Microwave and Wireless Technologies is to enhance the communication between microwave engineers throughout the world. It is therefore interdisciplinary and application oriented, providing a platform for the microwave industry. Coverage includes: applied electromagnetic field theory (antennas, transmission lines and waveguides), components (passive structures and semiconductor device technologies), analogue and mixed-signal circuits, systems, optical-microwave interactions, electromagnetic compatibility, industrial applications, biological effects and medical applications.