Researchers in South Korea have developed an ultra-thin film composite material that can absorb over 99% of electromagnetic waves across multiple frequency bands, including those used for 5G/6G, WiFi and autonomous vehicle radars.
The material is less than 0.5mm thick but has a reflectance of less than 1% and absorbance over 99%. This is much higher absorption than conventional materials which often only absorb 10% of waves.
It uses a magnetic material and conductive patterns on a polymer film to control wave propagation and absorb specific frequencies from different bands simultaneously. Carbon nanotubes further boost shielding.
Being thin, flexible and durable after thousands of folds, it is suitable for smartphones and rollable devices.
Absorbing waves eliminates interference better than just reflecting. This could improve reliability of wireless communication technologies.
Patents have been filed and the material is being applied to devices to evaluate real-world performance. The researchers say its importance will grow with 5G/6G expansion.
Source: Tech Xplore
