FCC Opens Terahertz Frequency Bands for Next-Generation Low-Earth Orbit Satellite Broadband Constellations

WASHINGTON — Opening the final unallocated frontier of radio frequency spectrum, the Federal Communications Commission voted 5-0 on Thursday to adopt comprehensive rules authorizing commercial satellite constellations and high-altitude platform stations (HAPS) to transmit across the 100 GHz to 300 GHz sub-terahertz frequency bands. The decision, lauded by telecommunications engineers and space tech entrepreneurs alike, provides the massive spectral bandwidth required to transform orbital satellite constellations into gigabit-speed global mesh networks capable of handling planetary-scale internet traffic. Until now, commercial low-Earth orbit (LEO) broadband networks have operated almost exclusively within the Ku, Ka, and V bands (12 GHz to 50 GHz). While these allocations democratized satellite internet access across remote rural communities and oceanic vessels, increasing user density and data-intensive applications—such as real-time holographic telepresence, multi-satellite synthetic aperture radar mapping, and autonomous maritime logistics—have rapidly exhausted spectral capacity in metropolitan and aviation corridors. The sub-terahertz bands provide contiguous frequency blocks twenty times wider than existing allocations, enabling satellite operators to deploy steerable multi-beam phased-array antennas capable of achieving individual link throughputs exceeding 100 gigabits per second. To overcome atmospheric water vapor attenuation—a fundamental physics challenge where higher frequency electromagnetic waves are absorbed by moisture in the lower atmosphere—the FCC framework mandates dynamic atmospheric beam-steering algorithms. Under this protocol, satellites intelligently switch between sub-terahertz high-capacity links during clear sky conditions and highly penetrative dual-band V-band backup links during heavy precipitation events. "Spectrum is the indispensable lifeblood of the modern digital economy," said FCC Chairwoman Jessica Rosenworcel following the open commission meeting. "By establishing clear, interference-free regulatory rules for the terahertz spectrum bands today, the United States is staking out global leadership in 6G and next-generation space-based telecommunications. We are ensuring that American aerospace innovators have the regulatory certainty needed to engineer satellites that deliver lightning-fast connectivity to every corner of the globe." The new rules also introduce strict orbital debris and space sustainability requirements. Operators seeking sub-terahertz licenses must demonstrate automated post-mission disposal capabilities that de-orbit decommissioned satellites within two years of operational termination, while incorporating optical and radio cross-link coordination protocols that prevent interference with passive space-based weather monitoring radiometers operated by NASA and the National Oceanic and Atmospheric Administration (NOAA).

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