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Near-field mobile terahertz (THz) communications is one of the candidateenablers for high-rate wireless data exchange in sixth-generation (6G)networks. However, operating in the THz near field brings both attractiveopportunities and severe challenges. Hence, it becomes of interest to exploreif it is possible to design a realistic mobile THz communication system withoutworking in the THz near field. To answer this question, a mathematicalframework is presented modeling a mobile THz link that works exclusively in thefar field. The study leads to an interesting theoretical conclusion: while theactual frequency is of (almost) no interest, such a system must operate over alimited bandwidth not exceeding a certain threshold. It is then numericallyshown that operating only in the far field imposes stringent limitations onmobile THz communications, thus making them less attractive to prospectivehigh-rate services. In contrast, it is shown that a stationary THz link canstill be broadband even when staying exclusively in the THz far field. Hence,broadband mobile THz communications MUST be near-field, while broadbandstationary THz links do not have to.

Near-field 6G Networks: Why Mobile Terahertz Communications MUST Operate in the Near Field