Radio spectrum is not by any means infinite, which means there are limits to the amount of usable spectrum any single use case or industry can be allocated. In most countries, mid-band spectrum between 2 GHz and 6 GHz available for mobile operator use will top out between 300 MHz of capacity and 600 MHz of capacity (available channel bandwidth rather than frequency of transmission).
source: Rethink Technology Research
Since low-band frequencies are even more restrictive, future growth of mobile capacity will have to come from new frequencies in the millimeter wave and teraHertz bands (up to 300 GHz for millimeter and between 300 GHz and 3,000 GHz for teraHertz spectrum).
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