Shielding can design for a DDR4 connector system to reduce RFI

Abstract

In latest laptop computers, the Wi-Fi performance has been degraded significantly due to the radio frequency interference (RFI) in 2.4-GHz ISM band caused by DDR4 memory. In order to solve this problem, a shielding can that is specifically designed for DDR4 connector interface is proposed in this work. We propose to add shielding finger structure to the ground contact of the long slot in the shielding can to improve the shielding effectiveness without increasing the number of ground contacts. 3D full-wave simulation is performed, and a test structure was fabricated and measured to prove the reduction in RFI. 8-dB reduction in the noise level is achieved by using the shielding finger structures proposed in this work.