Saturday 05 April 2025
For decades, scientists have been working on perfecting radar-absorbing materials (RAMs) that can reduce the visibility of aircraft and other objects in the air. These stealthy materials are designed to absorb or deflect radar waves, making it difficult for enemy radar systems to detect them.
Recently, researchers at Aeronautical Development Establishment (ADE), a leading aerospace research organization, made significant strides in developing a new type of RAM that can effectively reduce the radar cross-section (RCS) of aircraft. In simple terms, RCS measures how easily an object reflects radar waves back to the receiver. The lower the RCS, the harder it is for radar systems to detect the object.
The ADE team designed a novel radar-absorbing structure (RAS) using a Jerusalem cross unit cell configuration, which is essentially a pattern of interconnected squares and triangles. This design allows the material to absorb radar waves effectively across a broad range of frequencies.
To test the performance of their RAS, the researchers created a flat panel sample and simulated various scenarios using high-frequency electromagnetic simulations. The results were impressive: the RAS showed an RCS reduction of over 10 decibels (dB) from 4 to 18 gigahertz (GHz), which is a significant improvement over existing RAMs.
The team also studied the effect of rivets on the RCS performance of their RAS. Rivets are commonly used in aircraft construction, but they can potentially disrupt the radar-absorbing properties of the material. The researchers found that larger rivet surface areas led to degradation in RCS performance, while smaller rivet surface areas had a minimal impact.
To further validate their findings, the ADE team simulated the RCS performance of their RAS on an open-source aircraft CAD model. They discovered that all three RAS configurations showed similar RCS performance, with a median RCS reduction of around 10 dB from 4 to 18 GHz.
These advances in RAM technology have significant implications for military and aerospace applications. By reducing the RCS of aircraft, stealth technology can provide a critical advantage on the battlefield, allowing planes to evade detection and attack enemy positions without being detected.
The development of more effective radar-absorbing materials will also enable the creation of quieter and more efficient aircraft engines, as well as improved radar warning systems for civilian aircraft. As researchers continue to push the boundaries of RAM technology, we can expect to see even more innovative applications in the years to come.
Cite this article: “Riveting Results: The Impact of Fasteners on Radar Absorbing Structures Stealth Performance”, The Science Archive, 2025.
Radar-Absorbing Materials, Stealth Technology, Aeronautical Development Establishment, Radar Cross-Section, Jerusalem Cross Unit Cell Configuration, Electromagnetic Simulations, Rivets, Aircraft Construction, Military Applications, Aerospace Research
