Korean breakthrough: Ultra-thin film absorbs 99% of EM waves

A research team from the Korea Institute of Materials Science (KIMS) has created an innovative material that, in the form of a thin film just 0.02 inches thick, absorbs up to 99% of electromagnetic waves. This solution can significantly help eliminate interference generated by such waves. The development represents a significant breakthrough compared to existing shielding materials, which have only allowed the absorption of about 10% of the radiation.

The new material can absorb electromagnetic waves over a wide range of frequencies, including those used in 5G, 6G technologies, and Wi-Fi networks. This feature is crucial in environments filled with sources of such waves. Proper shielding can eliminate interference, which can negatively affect the performance of nearby devices.

Traditional electromagnetic shielding materials often reflect over 90% of waves, meaning the actual absorption is minimal, around 10%. Additionally, materials with higher absorption typically only work in a narrow range of frequencies, limiting their versatility. According to reports, the invention by scientists at KIMS does not have these limitations. Its significant advantages include high effectiveness while maintaining minimal thickness and appropriate flexibility.

The process of creating the material involved modifying the crystal structure of ferrite, which was then combined with a thin polymer film. Special conductive patterns were applied to the backside, enabling the control of electromagnetic wave propagation. By adjusting the shape of the conductive patterns, the reflection of electromagnetic waves at specific frequencies can be significantly reduced.

In addition, a thin film of carbon nanotubes was applied to the back of the material. These have a high shielding value, and this process is intended to further enhance the performance of the developed shielding material.

The material developed by the Korean researchers maintains its shape even after repeated bending and straightening. Scientists claim it can be bent thousands of times. For this reason, it is well-suited for applications in mobile devices, such as foldable smartphones or wearable devices.

"As 5G/6G communication applications expand, the importance of materials that absorb and shield electromagnetic waves grows. This material has great potential to improve the reliability of communication devices, such as smartphones and autonomous vehicle radars," said project leader Byeongjin Park.