An Electromagnetic Sail for Satellite Deorbitation: Tackling Space Debris with Deployable Composites

Published in 2025.

The Space Debris Problem

More than 27,000 pieces of orbital debris are currently tracked by space agencies — and millions more are too small to track but large enough to destroy a satellite on impact. As the number of launches increases with commercial space activity, the risk of cascading collision events (Kessler syndrome) grows. One of the most tractable solutions for small satellite operators is to design satellites that deorbit themselves at end-of-life, rather than remaining in orbit indefinitely.

For small satellites in low Earth orbit (LEO), passive electromagnetic deorbitation offers a particularly attractive approach: deploy a large conducting sail that interacts with Earth’s magnetic field to generate a continuous braking force — no propellant required.

The Composite Challenge

The challenge is packaging a large, conductive sail in a format that fits within the tight mass and volume constraints of a CubeSat or small satellite secondary payload. This is fundamentally a materials and structures problem: the sail must be

• Ultra-lightweight (mass budget is typically tens of grams)
• Highly packable (must deploy from a small container)
• Sufficiently conductive for electromagnetic drag
• Structurally reliable for deployment after months in orbit

Our Solution

This work presents a deployable composite panel architecture that meets these constraints. The sail combines thin conductive layers (for electromagnetic interaction) with a bistable or elastic composite backing (for stowed packaging and reliable deployment). The design is validated through ground deployment testing and electromagnetic performance analysis.

The results demonstrate that composite-based electromagnetic sails are a viable, low-cost deorbitation solution for the growing small satellite market — and that polymer composite manufacturing know-how has a direct role to play in keeping space sustainable.