RFI suppression and throughput improvement of WiFi performance with graphene coating for converging mobile device

As the wireless applications for high-performance computing and video streaming is booming, the converging high performance devices for wireless and mobile application bring up the platform noise and RFI de-sensitivity issue. The problem involving with electromagnetic compatibility (EMC) or radio frequency interference (RFI) is becoming more critical for the system integration of smart phones design. To prevent RFI noise coupling to sensitive RF front-end and thus degrading wireless communications performance, this paper is mainly focusing on the effective shielding analysis of graphene coating on RF noisy chips or modules. We first adopt the near-field electromagnetic interference (EMI) scanning methods developed by IEC for chip level (IEC 61967-3) to investigate the distribution of EMI noise sources characteristic on the smart-phone platform under investigation. To effectively shield the electric, magnetic, or electromagnetic field originated from noise source, we then apply the shielding capability of graphene coating on the RFI noisy sources. Finally, we will use Over-the-air (OTA) measurement to show the RF performance improvement with implementation of graphene coating from the relationship between data throughput increase and RFI reduction on chips or modules under investigation.