Electromagnetic Spectrum
The full range of electromagnetic radiation frequencies, portions of which are allocated for satellite communications, remote sensing, and space operations.
Explanation
Satellite operations depend on specific portions of the electromagnetic spectrum, regulated internationally by the International Telecommunication Union (ITU) and domestically by bodies like the FCC. Key satellite frequency bands include L-band (1-2 GHz) for mobile satellite services and GPS, C-band (4-8 GHz) for fixed satellite services, Ku-band (12-18 GHz) for broadcast and broadband, Ka-band (26-40 GHz) for high-throughput satellites, and V-band (40-75 GHz) for emerging LEO constellations. Spectrum allocation is a finite, contested resource. Operators must file for coordination, launch service, and regulatory approval years in advance. Spectrum rights are not permanently owned — they must be used and renewed. The growing demand from LEO constellations, 5G terrestrial networks, and scientific users has intensified competition for spectrum. Spectrum policy is a central battleground in the space industry, with incumbents (e.g., DirecTV, DISH) defending allocations against new entrants (e.g., SpaceX, Amazon).
Why It Matters
Spectrum is the fuel of the satellite industry. Without access to the right frequencies at the right功率 levels, no satellite can transmit or receive. Spectrum policy decisions shape which business models succeed and which fail.
Concept Map
How Electromagnetic Spectrum connects to other glossary terms:
Frequently Asked Questions
Can satellite frequencies be changed after launch?
In principle, yes, if the satellite is designed with software-defined radios or tunable filters. In practice, hardware is built for specific bands, and changing requires regulatory filings.
Why are higher frequencies better for satellites?
Higher frequencies (Ka-band, V-band) support wider bandwidths and higher data rates. However, they are more susceptible to rain fade and atmospheric absorption.
Sources
Last updated: July 1, 2026