(Part 3 of a 3-article series)

From Earth to Orbit: How Space Constraints Shape Every Design Decision

Space hardware does not begin its life in orbit. Long before a satellite ever leaves the ground, the antenna it carries has already been subjected to storage conditions, assembly constraints, launch vibrations, and the slow transition into vacuum. Every one of these phases leaves its mark on the design – and none of them can be treated as an afterthought.

In this third and final part of our series, Gautier Mazingue, RF Team Manager, and Mathias Nicolle, Mechanical-Thermal Team Manager at Anywaves, walk us through the full lifecycle of a space antenna: from the warehouse to orbit, and everything in between. The picture that emerges is one of engineering under permanent constraint — where decisions made months or years before launch determine whether a system survives its first hour in space.

This is the third article in our three-part series on what makes a good space engineer today:

– Part 1 explored the skills, mindset, and professional reality of space engineers in the context of NewSpace.

– Part 2 examined the day-to-day collaboration between RF and mechanical-thermal teams, and why compromise is at the heart of antenna design.

– Part 3 (this article) focuses on the full lifecycle constraints of space hardware, from storage on Earth to survival in orbit.

Designing for the Entire Lifecycle, Not Just the Orbit

How do space conditions — vacuum, extreme temperatures, radiation, and launch vibrations — influence RF antenna design?

Mathias Nicolle:

One of the key points people often overlook is that antenna design for space is driven by the entire lifecycle of the product, not just its operational phase in orbit.

It starts well before launch, during storage. Humidity can be a real issue, especially for materials sensitive to corrosion. This directly impacts material selection, but also forces production teams to design dedicated packaging solutions. Every material used must be compatible with defined storage conditions, sometimes for months or even years.

Then there is the choice of special processes, such as surface treatments, bonding, or PCB finishes. These processes often come with limited validity periods. For example, some PCB surface treatments are only guaranteed for six months. That constraint feeds back into planning, manufacturing schedules, and even design choices.

The launch phase is another major driver. Vibrations and shocks during lift-off impose strict constraints on geometry, thicknesses, fastening methods, and material robustness. What works mechanically on Earth may simply not survive the launch environment.

There is also a very specific phase during ascent that has a strong impact on RF and mechanical design. As the launcher climbs, air progressively escapes from the fairing. The system must not be hermetic — it must be able to vent properly.

If cavities are sealed, pressure differentials can create serious mechanical damage. That means venting paths must be designed from the beginning, and materials must be compatible with a progressively forming vacuum.

Another critical point is outgassing. Materials that release volatile compounds in vacuum can contaminate other satellite subsystems, including optical payloads or thermal surfaces. From an RF perspective, that also affects material selection and surface treatments.

Once in orbit, the constraints shift again. You now deal with extreme and repeated temperature cycles. Thermal management becomes central, defining thermal paths, heat dissipation, and temperature gradients across the antenna.

Every one of these lifecycle phases feeds back into the design. You cannot optimize only for in-orbit RF performance without considering storage, launch, and integration constraints.

Thermal Deformation, Material Aging, and RF Robustness

Which mechanical deformations or thermal dilations are the most critical for RF performance?

Gautier Mazingue:

Thermal effects are particularly critical because they directly affect geometry. From a thermal analysis standpoint, you don’t have a single CAD model — you have several geometries corresponding to different temperature states. The antenna “breathes” — it expands and contracts.

As RF engineers, our role is to ensure that RF performance remains robust across all these configurations. Performance degradation is expected, but it must stay within specification margins.

Changes in dimensions, even very small ones, can shift resonance frequencies, degrade matching, or alter radiation patterns. This is especially true at higher frequencies, where tolerances become extremely tight.

Mathias Nicolle:

Material aging also plays a role. Over time, materials are exposed to radiation, atomic oxygen, and UV. Atomic oxygen, in particular, can erode certain materials, while radiation can modify material properties.

To protect the antenna, radomes are sometimes required. But a radome is never just a mechanical solution. Its dielectric properties, thickness, and shape must be fully accounted for from an RF standpoint.

More broadly, space forces engineers to constantly challenge their designs against constraints that simply do not exist on Earth — microgravity, radiation, atomic oxygen, contamination, and vacuum compatibility.

Gautier Mazingue:

That’s why RF design in space is not just about electromagnetics. It’s about understanding how all these environmental effects interact with materials, geometry, and performance over time — and ensuring the system remains compliant from launch to end of life.

The Launcher as a Design Driver

Does the launcher influence your design choices?

Mathias Nicolle:

Yes, the launcher can have a significant influence, but not always in a straightforward way. In many cases, the customer does not specify a single launcher from the beginning. Instead, they provide an envelope of possible launchers the satellite may fly on. They also typically define mechanical levels that cover this range, with margins corresponding to the most constraining cases.

Each launcher comes with different mechanical environments, especially in terms of vibration and shock levels. Whether the satellite is launched inside a dispenser or directly attached to the launcher also makes a significant difference. Some launchers are much more severe than others.

In some situations, the mechanical specifications allocated to the antenna can even give indications about the likely launcher — for example when shock levels are particularly high. Vega-C, for example, is much harsher than Falcon 9 in some respects.

However, this is not always explicitly stated, and the design must remain robust enough to accommodate several launch scenarios.

These levels directly impact the design, from structural sizing and interfaces to material selection and fastening strategies. They also strongly influence the qualification and acceptance test campaigns, which must reproduce the specified mechanical environment.

This uncertainty reinforces the need for conservative design choices and close coordination between mechanical, thermal, and RF teams, to ensure the antenna remains compliant regardless of the final launcher selection.

Material Selection: A Multi-Constraint Balancing Act

How do you select materials compatible with RF, mechanical, and thermal constraints?

Both:

Material selection is a transversal process.

You must balance RF properties — permittivity and conductivity — mechanical strength, thermal stability, vacuum compatibility, procurement constraints, cost, and lead time.

For example, in some cases, it may be necessary to switch to a different material grade when the initially selected one is not immediately available. This is only considered when the impact on RF, mechanical, and thermal performance remains marginal, and when it does not compromise qualification or reliability.

We rely on heritage materials whenever possible. For new or “exotic” materials, especially PCB substrates, we perform dedicated tests before integrating them into Anywaves’ internal material database. Public databases, such as NASA references, are also valuable sources for outgassing and environmental data.

Conclusion: Engineering Begins Long Before Launch

What this conversation makes clear is that the constraints of space do not begin at the moment of launch, and they certainly do not end once an antenna reaches orbit. They are present from the earliest design reviews, embedded in every material choice, every interface decision, every manufacturing schedule.

An antenna that “works” on paper is not enough. It must survive storage, withstand the violence of launch, adapt to the progressive formation of vacuum, and then perform reliably across thousands of thermal cycles — all without the possibility of repair or intervention.

For Gautier and Mathias, meeting that challenge requires more than technical expertise in a single discipline. It requires a continuous, lifecycle-aware collaboration between RF, mechanical, thermal, and materials engineering — one where the end state in orbit is always kept in mind, even when the hardware is still on the production floor.

This concludes our three-part series on space antenna engineering.

Part 1 — What Makes a Good Space Engineer Today? Skills, Mindset, and the NewSpace Context

Part 2 — RF and Mechanical-Thermal Engineering: Why Compromise Is the Core of Space Antenna Design