Wideband GBN suppression in high-speed printed circuit boards and packages using double-side electromagnetic band-gap structure

A novel double-side uniplanar electromagnetic band-gap(EBG) structure operating at lower GHz frequencies (below 6 GHz) is proposed with wideband suppression of the ground bound noise (GBN) in printed circuit board. Our proposed structure significantly enlarges the capacitances inside unit cell to achieve a lower cutoff frequency and a wider bandwidth. Characteristics of the EBG structure, such as bandgap and cutoff frequency, are analyzed. Simulation results show that using the proposed EBG structure, it is possible to obtain a wider bandgap from 1.8 GHz to 4.6 GHz which covers the operating frequency of the GBN noise and a cutoff frequency of 3.2 GHz. Compared with the conventional UC-EBG structure, the cutoff frequency and the bandgap are greatly improved.