Inside the Transmitter: Amplifiers, Antennas and Heat
Why is the transmitter often the hardest part of a microwave solar power satellite?
Chapter summary
because it must convert gigawatts of electricity into a coherent microwave beam with high efficiency and very low mass, and reject the waste heat into space.
Key takeaways
- 1
A kilometre-scale phased array contains millions of small amplifiers and antenna elements, each driven at the right phase to steer the beam.
- 2
At 85% conversion efficiency, a plant transmitting about 2.8 GW of microwaves must radiate roughly 0.5 GW of heat from the transmitter alone, in vacuum, where heat can leave only by radiation.
- 3
Amplifier efficiency, element cost and thermal design therefore decide transmitter mass, and transmitter mass decides much of the launch bill.
Keep reading with Space access
This chapter (1 exhibits, 393 words) is part of Space & aerospace. Space access opens every chapter of all 11 Space reports, with the interactive models, Excel downloads, Ask and named Atlas records.
- Global Market Analysis: Deep Space Economy
- Space-Based Datacenters: Feasibility Study
- Commercial Space Stations: Feasibility Study
- Defence Space and Missile Defence: Golden Dome and the SDA Architecture
- Launch After Starship: Prices, Capacity and European Sovereign Launch, 2026–2035
- Satellites to Phones: Direct-to-Device Connectivity, Spectrum and Economics, 2026–2035
- Space Supply Chain Bottlenecks: Components, Minerals and Capacity, 2026–2030
- Lunar, Cislunar and Settlement Economics: What the Moon Costs and Who Pays, 2026–2060
- Earth Observation and AI Analytics: What a Square Kilometre Is Worth and Who Captures It, 2026–2035
- In-Space Manufacturing and Microgravity Biotech: Products, Platforms and Economics, 2026–2035
- Space-Based Solar Power: Physics, Costs and the Path to Firm Power from Orbit, 2026–2050
€199 a month or €1,490 a year per sector, after a 7-day free trial. Cancel any time. Need several sectors? All sectors: €999 a month.
Check the live record Space Contracts & Tender Radar · Space Claim Check (free)
Ask about this chapter
Answers drawn from every Setcoin report and the live Atlas. Each statement links to the passage behind it.
Ask is included with every subscription
Cited answers across every report and the Atlas, with follow-up questions and a hand-off to the opportunity finder.
Research for professional investors. Not investment advice, and not an offer of any security or fund interest.