Carbon nanostructures as potential candidate for Electromagnetic Interference Shielding in Ka- band of microwave frequency*

Carbon nanostructures have found wide-ranging applications in various industries due to their lightweight, and excellent fatigue resistance. This study explores the electromagnetic interference (EMI) shielding efficiency of unidirectional carbon fiber reinforced polymers (CFRPs), which are known for their anisotropic electrical properties. The study measured the EMI shielding efficiency for the frequency range of 26 GHz to 40 GHz in both the plane and perpendicular directions of the CFRP, highlighting how it impacted the samples. Interestingly, the efficiency increased when the CFRP was combined with multiwall carbon nanotubes, placed one inch apart in patterns, providing additional localized sites for electron hopping. This resulted in a significant increase in EMI shielding efficiency.