Commercial use of teraHertz frequencies between 90 GHz and 300 GHz will be the object of much research between now and the time 6G launches, in large part because such frequencies are a vast trove of additional capacity available for fixed or mobile network applications.
Small cells and better radios (multiple input, multiple output) are almost certainly required, to deal with line of sight and limited propagation characteristics at these frequencies.
source: Brave Research Project
Though challenging, Moore's Law does help. Millimeter wave frequencies once were not commercially usable for mass market communications until we applied cheap and plentiful signal processing. The same will help with commercialization of sub-teraHertz frequencies as well.
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