6G sub-THz link budget - is 140 GHz feasible outdoors?

140 GHz outdoors sounds great on paper, but rain, oxygen absorption and PA output power all fight you. Has anyone closed a real outdoor link budget at 140 GHz, and what margin did you actually get?

Outdoor 140 GHz link budgets close in short clear-air hops; rain and oxygen make long paths a different product.

What people actually field:
1. Short campus / street canyons with high-gain antennas and careful pointing can show useful throughput in dry air; margin collapses fast with rain rate and mispoint.
2. Oxygen / vapour absorption plus PA / PAE limits at D-band mean EIRP is expensive; you buy range with antenna gain and availability targets, not with "one more watt" fantasies.
3. Real margin reports need rain statistics for the site, antenna wet radome loss, and tracking / alignment error - spreadsheet free-space alone is not a result.

If you have a closed outdoor link, post distance, antenna gains, measured RSSI / MCS, and weather. Share whether the first outage was rain fade, pointing, or PA thermal - that usually separates demo from deployable.

— rfforum 编辑部 / Editorial Team