A Novel Double-Square Electromagnetic Bandgap Structure for Wideband SSN Suppression in High-Speed PCB

摘要

In this article, a novel double-square planar electromagnetic bandgap structure for suppressing wideband simultaneously switching noises is proposed. The equivalent circuit model for its periodic structure design is carefully developed and analyzed for the function as a band-stop filter. The performance of the circuit model is experimentally verified and lower cutoff frequency $(f_{L})$ can be effectively predicted, while keeping the compact size of the structure. Two test boards are fabricated and the measurement results show that the noise suppression performance can reach –30 dB between two adjacent ports from 3.2 to 21.2 GHz. To prove the solid signal transmission quality of the proposed structure in high-speed printed circuit board, feasibility studies on eye patterns are conducted at four different coded rates. All the performance results and the comparison with other works show its salient feature of solid signal integrity in both the frequency and time domains.