As governments and defense organizations increase their reliance on satellite networks, protecting communications from interference has become a growing priority.
Researchers at MIT Lincoln Laboratory are developing a new antenna system that addresses this challenge while keeping size, weight, power consumption, and cost to a minimum.
The project focuses on tactical satellite communications(SATCOM). These systems are designed to maintain reliable communications even when adversaries attempt to disrupt signals. The need for secure communications is more important as more satellites are launched into low Earth orbit.
Low Earth orbit(LEO), is a region of space relatively close to Earth. Many new satellite constellations operate there because it allows faster communications and lower signal delays. However, the growing number of satellites also creates new challenges for maintaining secure and uninterrupted connections.
MIT Lincoln Laboratory’s new prototype antenna is called the Hosted Nimble Beamforming Anti-Jam Reflectarray(HoNi BAJR). The system is designed specifically for proliferated low-Earth orbit environments. These environments host large numbers of satellites that must remain lightweight and energy-efficient.
One of the biggest threats to satellite communications is signal jamming. Jamming occurs when unwanted radio signals overwhelm or disrupt communications. Another concern is signals intelligence, where adversaries attempt to intercept communications for information gathering.
Traditional methods of protecting satellite communications often require complex hardware. These systems can become large, heavy, and expensive. Such requirements make them difficult to deploy on smaller satellites that have limited space and power.
The MIT team chose a different approach based on adaptive antenna arrays. Unlike standard antennas, antenna arrays use multiple antenna elements that work together. This allows the system to direct signals more precisely and adjust performance as conditions change.
Adaptive arrays can reshape communication beams in real time. They can also create signal nulls, reducing interference from specific directions. This capability helps satellites maintain communication even in challenging environments.
While adaptive arrays are effective, they usually require significant power and hardware resources. That creates problems for small satellites operating in large constellations. Researchers wanted to achieve similar performance while reducing resource demands.
MIT Antenna Transforms Space Communications
The result was the HoNi BAJR reflectarray design. A reflectarray consists of a surface composed of many reflective elements. Each element can be individually controlled to influence how signals are reflected and combined.
When a radio signal reaches the reflectarray surface, the reflective elements adjust the signal phase. These adjustments help form communication beams in desired directions. The process also helps reduce the impact of interference and jamming.
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Reflectarrays share some similarities with phased-array antennas. Both technologies use many elements to shape radio beams electronically. However, reflectarrays simplify the overall design by reflecting signals toward a separate feed antenna.
The feed antenna plays a central role in the system. Instead of requiring an amplifier behind every antenna element, signals are collected and combined through the feed antenna. This significantly reduces system complexity and power consumption.
Researchers estimate that the reflectarray architecture lowers power use by roughly 95 percent compared with conventional antenna arrays. That reduction is important for satellites operating under strict power limits. Lower power demands also help reduce heat generation and system weight.
Another advantage of the design is scalability. Engineers can increase the reflectarray’s size without completely redesigning the beamforming network. This makes future upgrades and mission-specific configurations easier to implement.
The HoNi BAJR prototype was built to support communications across wide areas of the horizon. It was designed for low-power users operating in the presence of multiple jamming sources. The antenna is also compact enough to fit on a typical small satellite platform.
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Researchers tested the system at MIT Lincoln Laboratory’s RF Systems Testing Facility. The testing evaluated the antenna’s ability to scan across large angles. Results showed that the array could receive signals from a broad coverage area.
The team also examined how the antenna handled multipeak beams. Multipeak beamforming enables a single-antenna system to communicate with multiple users simultaneously. Test results showed very little signal loss when beams were split among different users.
The ability to support multiple users efficiently is important for future satellite networks. Large constellations often need to serve many locations simultaneously. Effective beam management helps maximize network performance without adding excessive hardware.
Interference suppression remains another major focus of the project. The research builds on earlier internal programs known as Deployable Electronically Scanning Reflectarray (DESRa) and Phase Analog Beamforming (PhAB). These efforts explored methods to reduce interference and adapt to changing signal conditions.
Previous work demonstrated that reflectarrays could create nulls and respond to jamming in real time. However, highly dynamic environments present additional challenges. Signals can change rapidly, leaving little time for conventional adaptation methods.
To address this issue, researchers developed a new strategy. Instead of targeting individual interference points, the antenna creates broader regions of interference suppression. This is achieved by carefully shaping beam side lobes around areas where unwanted signals are present.
Early tests showed promising results. However, controlling side lobes precisely remains difficult because they are sensitive to small signal variations. Researchers believe improved calibration techniques can help solve this challenge.
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Calibration is currently one of the most important areas of development. Calibration ensures that engineers fully understand how signals move through the system. Accurate calibration improves beam shaping, signal quality, and interference suppression.
The challenge is that there are few examples of how to calibrate scanning reflectarrays. Researchers are therefore developing new methods and procedures. Better calibration is expected to unlock more of the technology’s potential.
The team is also studying where reflectarrays can deliver the greatest value. Early findings suggest the technology works particularly well in scheduled communication scenarios. It also appears suitable for environments with significant interference and strict power limitations.
The research highlights a broader trend in satellite communications. Operators need systems that deliver advanced performance without increasing costs or resource requirements. Technologies that reduce size, weight, and power while maintaining capability are more important.
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As satellite constellations continue to grow worldwide, demand for resilient communications will also increase. Secure links are essential for defense operations, disaster response, and other mission-critical activities. Protecting those connections against interference remains a key objective.
MIT Lincoln Laboratory plans to continue refining the HoNi BAJR system. Future work will focus on improving calibration methods, expanding beamforming capabilities, and exploring additional operational uses.
However, the technology can help shape a new generation of secure, efficient satellite communication systems for crowded, contested space environments.
