Wideband SSN suppression and EMI reduction from printed circuit boards using novel planar electromagnetic bandgap structure

Abstract

A novel design of planar electromagnetic bandgap (EBG) structure with super cell configuration for mitigating simultaneous switching noise (SSN) is proposed. A wide bandgap covering the frequency range from 250MHz to 5GHz is demonstrated by both simulation and measurement, and a good agreement is observed. The disadvantage of this EBG-based power plane is that its imperfect plane may cause spurious and unwanted radiation. In this paper, leakage radiation through this perforated plane is also carefully investigated. Finally a novel concept of using this EBG structure for electromagnetic interference (EMI) reduction is introduced. Index term: electromagnetic bandgap (EBG), simultaneous switching noise (SSN), electromagnetic interference (EMI)