The global satellite communications landscape reached a significant milestone on May 5 with the announcement of a landmark partnership between Swissto12, a leading Swiss aerospace manufacturer, and the German high-performance space subsystem consortium HPS/LSS. This strategic collaboration is set to revolutionize the geostationary (GEO) satellite sector by integrating advanced Large Deployable Reflector Subsystem (LDRS) technology into the NEASTAR-1 mission. Built upon Swissto12’s proprietary HummingSat platform, the mission aims to provide the world’s first direct-to-device (D2D) media broadcasting capabilities from geostationary orbit, a move that could fundamentally alter how digital content is delivered to consumer hardware across the globe.
The agreement marks a pivotal moment for European space sovereignty and technological innovation. Under the terms of the contract, the Munich-based HPS/LSS will provide the critical LDRS hardware required to facilitate high-gain, wide-area communications from the compact HummingSat bus. The project is backed by a robust funding structure, co-funded by the European Space Agency (ESA) with core support from the German Space Agency at the German Aerospace Center (DLR). Additional contributions from various ESA Member States further underscore the pan-European commitment to developing resilient and competitive space infrastructure.
Technical Foundations: HummingSat and the LDRS Advantage
At the heart of this partnership is the HummingSat platform, a "Small GEO" satellite class developed by Swissto12 in collaboration with ESA through a Public-Private Partnership (PPP). Traditional geostationary satellites are often the size of a large bus, weighing several tons and costing hundreds of millions of dollars to manufacture and launch. In contrast, the HummingSat is designed to be significantly smaller and more cost-effective, occupying a volume of about one to two cubic meters and weighing approximately 1,000 kilograms.
Despite its reduced size, the HummingSat does not compromise on performance. This is made possible through Swissto12’s pioneering use of Additive Manufacturing (3D printing) for Radio Frequency (RF) components. By 3D-printing complex waveguide structures and antenna components, the company can achieve weight reductions of up to 40% while maintaining superior signal integrity.
However, enabling direct-to-device connectivity—transmitting data directly from a satellite 35,786 kilometers away to a standard smartphone or handheld device—requires a massive antenna aperture to capture and focus signals. This is where HPS (High Performance Space Structure Systems) and its subsidiary LSS (Large Space Structures) come in. The LDRS is a sophisticated mechanical system that remains folded during launch and unfurls in space to create a large-diameter reflector. This large surface area is essential for the link budget required to communicate with low-power consumer devices on the ground.
Chronology of Development and Mission Origins
The path to the NEASTAR-1 mission has been paved by years of incremental innovation in both Switzerland and Germany. Swissto12, originally a spin-off from the École Polytechnique Fédérale de Lausanne (EPFL), spent over a decade perfecting 3D-printed RF technology before pivoting toward full satellite integration.
The HummingSat program was officially unveiled at the ESA Council at the Ministerial level in 2019, gaining traction as a solution for operators seeking more flexible and affordable access to geostationary slots. By 2022, Swissto12 had secured its first commercial customer, Intelsat, for the IS-45 satellite, validating the Small GEO concept.
The partnership with HPS/LSS represents the next evolution of this platform. HPS has a long-standing heritage in the European space sector, having contributed to major missions including the Copernicus program and various ESA science missions. The development of the LDRS technology has been a multi-year effort within the German space industrial base, aimed at reducing dependence on non-European suppliers for large-scale deployable structures.
The May 5 announcement follows a period of rapid prototyping and technical reviews. With the contract now finalized and funding secured through DLR and ESA, the NEASTAR-1 mission moves into its critical design and manufacturing phase, with an eye toward a launch window that aligns with the growing demand for D2D services.
Strategic Alignment with the German Space Strategy
The collaboration is deeply embedded in the strategic objectives of the German Federal Government. Germany’s recently updated Space Strategy emphasizes the importance of "New Space" approaches—characterized by speed, cost-efficiency, and commercial viability—to maintain industrial competitiveness.
A key pillar of this strategy is the enhancement of secure communications and sovereign capabilities. By supporting the NEASTAR-1 mission, the German Space Agency (DLR) is fostering a domestic supply chain for critical satellite subsystems. The ability to broadcast media and data directly to devices from GEO is seen as a strategic asset, particularly for emergency broadcasting, national security, and providing connectivity to regions with limited terrestrial infrastructure.
Emile de Rijk, CEO and founder of Swissto12, highlighted the synergy between the two companies, stating, “Collaboration with HPS/LSS was fast and effective from the first day. We value their culture of precision engineering, deep-tech innovation, and commitment to excellence along with a drive for fast and efficient execution. They have demonstrated a strong technical heritage and proven track record in building LDRS, notably for ESA missions, underscoring the progress of ESA and DLR’s vision to develop resilient, sovereign space capabilities.”
Direct-to-Device: The Next Frontier in Telecommunications
The satellite industry is currently undergoing a paradigm shift toward direct-to-device (D2D) connectivity. Historically, satellite communication required specialized hardware, such as satellite phones or fixed VSAT dishes. Recent developments by companies like Starlink, AST SpaceMobile, and Lynk Global have focused on Low Earth Orbit (LEO) constellations to provide D2D messaging and voice services.
The NEASTAR-1 mission is unique because it seeks to provide these capabilities from Geostationary Orbit. While LEO satellites are closer to Earth, they move rapidly across the sky, requiring a large constellation of hundreds or thousands of satellites to maintain continuous coverage. A GEO satellite, however, remains fixed over a single point on the equator, providing constant coverage to a massive geographic "footprint" with just one spacecraft.
For media broadcasting—such as live video, data casting, and emergency alerts—the GEO advantage is significant. It allows for a stable, high-bandwidth downlink that can be received by millions of devices simultaneously without the "handover" complexities associated with LEO constellations. This makes HummingSat an attractive option for national broadcasters and telecommunications operators looking to augment their 5G networks with satellite-based "over-the-top" (OTT) delivery.
Industry Implications and Market Analysis
The partnership between Swissto12 and HPS/LSS is expected to trigger several ripples across the aerospace market:
- Cost Reduction for GEO Missions: By utilizing the Small GEO HummingSat bus, operators can deploy services for a fraction of the cost of traditional GEO satellites. This lowers the barrier to entry for smaller nations or regional telecom companies to own and operate their own space assets.
- Technological Maturity of Deployables: The successful deployment of an LDRS on a Small GEO platform will prove that large-aperture missions are no longer restricted to heavy-class satellites. This could lead to a surge in demand for HPS/LSS reflectors for other applications, including signals intelligence and Earth observation.
- Spectrum Efficiency: D2D from GEO requires careful management of frequency bands to avoid interference with terrestrial cellular networks. The precision engineering of the Swissto12/HPS hardware is designed to maximize spectral efficiency, a key requirement for regulatory approval from the International Telecommunication Union (ITU).
- European Autonomy: As the European Union moves forward with its IRIS² (Infrastructure for Resilience, Interconnectivity and Security by Satellite) constellation, the technologies developed for NEASTAR-1 will likely serve as a blueprint for the GEO component of the EU’s multi-orbit secure connectivity strategy.
Future Outlook and Mission Milestones
As Swissto12 and HPS/LSS move forward, the focus will shift to the rigorous testing of the LDRS integrated with the HummingSat chassis. Space environments are notoriously harsh, and the deployment mechanism of the large reflector is a "single point of failure" component that requires exhaustive validation. Thermal vacuum testing, vibration analysis, and RF characterization will be conducted at facilities in Germany and Switzerland to ensure the mission can withstand the stresses of launch and the extreme temperature swings of geostationary orbit.
The success of NEASTAR-1 will likely catalyze a new era of "Media-from-the-Sky," where the distinction between terrestrial mobile networks and satellite networks becomes increasingly blurred for the end-user. If successful, the mission will demonstrate that the combination of Swiss 3D-printing innovation and German precision mechanical engineering can produce a world-class telecommunications platform capable of challenging established industry giants.
In the broader context of global aerospace competition, this partnership signals that Europe is not merely a participant but a leader in the New Space economy. By focusing on high-value, high-complexity subsystems like the LDRS and the HummingSat bus, Swissto12 and HPS/LSS are carving out a specialized niche that addresses the most pressing needs of the modern digital age: connectivity, security, and efficiency.
The industry will be watching closely as the NEASTAR-1 project progresses toward its launch date. If the mission delivers on its promise of GEO-based direct-to-device media broadcasting, it will represent one of the most significant technological leaps in satellite communications since the launch of the first Syncom satellite in the 1960s. For now, the partnership stands as a testament to the power of cross-border collaboration in pushing the boundaries of what is possible in the final frontier.
