Abstract

Overview

This paper introduces a novel method designed for the measurement of the Whole-body Specific Absorption Rate (WBSAR) in millimeter-wave base stations within reverberation chambers.

Methodology

The adopted approach involves the deployment of a phantom to determine WBSAR by calculating the difference between total radiated power with and without the phantom. A specialized chamber transfer function was also employed to focus solely on direct illuminations from the Equipment Under Test (EUT), eliminating influences from reverberation chamber's multipath reflections.

Experimental Setup and Findings

• The study utilized a horn antenna and a commercial massive multi-input–multi-output base station for evaluations.
• Measurements were conducted at 28 GHz and showed conformity with earlier simulations, suggesting high reliability.
• The new method significantly reduces the testing duration to approximately 3 minutes, offering a quicker alternative to traditional methods.

Conclusion

The findings support the method's capability for swift assessments of base station products to ensure they meet the 2020 guidelines set by the International Commission on Non-Ionizing Radiation Protection for electromagnetic field exposure up to 300 GHz.