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A power/ground plane pair is proposed using a novel planar electromagnetic bandgap (EBG) structure for isolating the power-to-ground noise (PGN) in high-speed circuits. Each unit cell of the novel EBG is designed by etching slots in a “C” shape on the power plane while maintaining the ground plane solid. Without cascading hybrid periodic structures, it shows an efficient mitigation of PGN within an ultra-wideband frequency range of 0.25-2.18 GHz. In this paper, the equivalent circuit model and cavity mode analysis for the novel EBG unit cell are given to quickly predict the lower and upper bound cutoff frequency, respectively. The dispersion diagram of the proposed EBG structure is validated by insertion loss measurements with ports at different locations of the unit cell for different modes. The result shows that there is a good consistency between the simulated and measured results.