Evaluation of the Actual EMF Exposure from Extreme Massive MIMO Base Stations around 10 GHz using Channel Modelling

Massive MIMO is a key 5G technology and will be even more important for future generations of cellular standards such as 6G. The system performance improvements offered by this technology and the possibility to develop larger antenna arrays for new frequency bands pave the way to the future deployments of extremely large multi-antenna systems. This paper provides an analysis of the actual EMF exposure levels from extreme massive MIMO active antenna array systems that are targeted for 6 G mobile networks in the 715 GHz frequency range. Various antenna array dimensions have been investigated, from a $12 \times 8$ array of 192 antenna elements to a $24 \times 16$ array with 796 antenna elements. Modelling studies have been performed at 10 GHz. The actual maximum approach has been implemented as recommended in IEC 62232:2022. The modelling results provide a range of power reduction factors $\left(F_{\mathrm{PR}}\right)$ from $-\mathbf{7. 1} \mathrm{dB}$ to -10.7 dB with increasing antenna array size.