Korean breakthrough: New material 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 with a thickness of just 0.5 millimetres, absorbs as much as 99% of electromagnetic waves. This solution can significantly help eliminate interference generated by the waves. The developed material is 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 and 6G technologies and Wi-Fi networks. This feature is crucial in an environment filled with sources of such waves. Proper shielding eliminates interference, which can negatively affect the performance of other nearby devices.

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

They were 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 pattern, it is possible to reduce the reflection of electromagnetic waves at specific frequencies significantly.

Additionally, a thin film of carbon nanotubes was applied to the back of the material, enhancing its shielding capabilities. This process is intended further to improve the performance of the developed shielding material.

The material developed by the Koreans 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.

"This material has the potential to significantly improve the reliability of wireless communication devices such as smartphones and radars in autonomous vehicles," said project leader Byeongjin Park.