  This paper demonstrates how spectrum up to 1 THz will support mobile
communications beyond 5G in the coming decades. Results of rooftop surrogate
satellite/tower base station measurements at 140 GHz show the natural isolation
between terrestrial networks and surrogate satellite systems, as well as
between terrestrial mobile users and co-channel fixed backhaul links. These
first-of-their-kind measurements and accompanying analysis show that by keeping
the energy radiated by terrestrial emitters on the horizon (e.g., elevation
angles $\leq$ 15\textdegree), there will not likely be interference in the same
or adjacent bands between passive satellite sensors and terrestrial terminals,
or between mobile links and terrestrial backhaul links at frequencies above 100
GHz.
