Abstract
Power bus noise and EM interference (EMI) problems caused by power bus impedance resonance have become a major concern for EMC engineers engaged in printed circuit board (PCB) design. However, electromagnetic band-gap (EBG) is an array structure periodically arranged by the dielectric, metal or hybrid of them. In this paper, a fast algorithm based on the cavity-mode model is combined with the segmentation method to calculate the impedance characteristic of a power bus whose dielectric layer is an EBG structure composed of two different dielectric materials. It is shown that the EBG structure can significantly contribute to resonance suppression.
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