  Terahertz frequency bands will likely be used for the next-generation
wireless communication systems to provide data rates of hundreds of Gbps or
even Tbps because of the wide swaths of unused and unexplored spectrum. This
paper presents two outdoor wideband measurement campaigns in downtown Brooklyn
(urban microcell environment) in the sub-THz band of 140 GHz with TX-RX
separation distance up to 100 m: i) terrestrial urban microcell measurement
campaign, and ii) rooftop surrogate satellite and backhaul measurement
campaign. Outdoor omnidirectional and directional path loss models for both
line-of-sight and non-line-of-sight scenarios, as well as foliage loss (signal
attenuation through foliage), are provided at 140 GHz for urban microcell
environments. These measurements and models provide an understanding of both
the outdoor terrestrial (e.g., 6G cellular and backhaul) and non-terrestrial
(e.g., satellite and unmanned aerial vehicle communications) wireless channels,
and prove the feasibility of using THz frequency bands for outdoor fixed and
mobile cellular communications. This paper can be used for future outdoor
wireless system design at frequencies above 100 GHz.
