A novel coplanar electromagnetic bandgap (EBG) structure is proposed for efficiently suppressing the simultaneous switching noise in high-speed printed circuit boards and microwave circuits. The unit cells of the EBG structure on the power plane are connected by oblique lines. This modification enhances the performance effectiveness of the EBG structure in terms of high efficiency and the ultra-wide frequency bandwidth of noise suppression. Based on the numerical experiments, it is demonstrated that more than 40 dB reduction in S-parameters can be achieved in an ultra-wide frequency bandwidth up to 12 GHz.
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