Speaker
Description
A numerical assessment of the radio frequency (RF) electromagnetic field (EMF) exposure behind a massive multiple-input multiple-output (mMIMO) radio base station (RBS) and to the side of the RBS from the back surface is performed. The model of the antenna array contains 8 × 8 dual-polarized cavity-backed stacked patch elements and it is mounted on a box representing the RBS chassis. The RF EMF exposure is assessed for constant transmission at maximum power of 377.6 W, at frequency of 3.5 GHz, and for different steered beams within the scanning range to find its maximum for distance between the RBS model and phantom shell of 0 cm (touch position). The results of the RF EMF exposure simulations, conducted over a large area behind the mMIMO RBS model, show that the maximum 10-g specific absorption rate (SAR) and whole-body averaged SAR behind and to the side of the RBS are below the corresponding international limit values for general public and occupational exposure. If beam scanning, RBS utilization, and scheduling time, which are reasonably foreseeable, are considered then the time-averaged power will be significantly reduced and therefore also the RF EMF exposure.
