Stuttgart PhD Research Proposes Indefinite Satellite Orbit Using Atmospheric Air as Fuel
Francesco Romano’s PhD research at the University of Stuttgart introduces a new atmosphere-breathing electric propulsion (ABEP) system that could allow satellites to remain in Very Low Earth Orbit (VLEO) indefinitely without carrying conventional propellant. The system uses a radio-frequency helicon plasma thruster paired with a specular intake to capture atmospheric gases, specifically atomic oxygen, argon, and nitrogen, and convert them into thrust. Laboratory tests demonstrated that the thruster can operate reliably with only 50-60W of power, while modeling suggests it could sustain a satellite between 190 and 250 km altitude using less than 1.6 kW. Although the technology addresses the high cost and limited supply of xenon fuel, it remains unproven in actual space missions due to challenges like atomic oxygen corrosion and atmospheric variability.
Key points
- The ABEP system eliminates the need for onboard propellant by using atmospheric gases as fuel, potentially enabling indefinite satellite operation in VLEO.
- Romano’s design features a specular intake that captures approximately 94.3% of air particles, maintaining efficiency even with a 15-degree tilt.
- The thruster uses an MRI-inspired birdcage antenna to deliver 99% of electrical power efficiently, avoiding the need for a neutralizer cathode that is prone to corrosion.
- Modeling indicates the system could operate between 190 and 250 km with under 1.6 kW of power, well within the capabilities of standard spacecraft solar panels.
- The concept also shows potential for use on Mars, where it could support spacecraft at 120-160 km altitude using the planet’s CO2-rich atmosphere.
Background
This development builds on earlier coverage from September 2026, which first reported on Romano’s ABEP concept and its potential to solve the fuel limitations of VLEO satellites. The current briefing confirms the specific performance metrics of the specular intake and the birdcage antenna, which were previously noted as promising but untested in a real-world mission. The context also highlights the broader trend of increasing satellite density in low Earth orbit, as seen in the August 2026 report on Starlink’s dominance, which underscores the need for sustainable propulsion solutions to avoid orbital congestion and Kessler Syndrome.
Why it matters
If proven in space, this technology could revolutionize satellite operations by removing the need for costly propellant like xenon, allowing satellites to remain in VLEO indefinitely. This would enable sharper remote sensing, more efficient communications, and natural deorbiting of inactive satellites, reducing the risk of orbital debris. The potential application on Mars also opens new avenues for deep space exploration and sustained presence on other planets.
What to watch
The next step is to determine if Dr. Romano or other researchers will pursue the transition from laboratory testing to actual space missions. The technology must be de-risked and proven to work in the variable conditions of the upper atmosphere before it can be adopted for commercial or scientific use. Monitoring for any announcements regarding funding or partnership for a demonstration mission will be key.
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