A novel Electromagnetic Bandgap power plane with low radiation and wideband noise suppression

A compact reduced size new Electromagnetic Bandgap (EBG) structure with multiple narrow slits unitcell in power plane is presented. By concatenating 2 × 2 high frequency unitcells a virtual low frequency EBG unitcell is created without changing the over all dimensions of the EBG making a compact design. Newly designed EBG operates over a frequency band of 0.9 GHz to 3.5 GHz with a good isolation of better than -40 dB over the band. The proposed design suppresses radiated emission (or electromagnetic interference) with in the stop-band. Emission characterisation has been carried out for both vertical and horizontally polarised signals and radiated emission of the new EBG is found to be small when compared with solid power/ground planes. Measured characteristics demonstrated a low emission from the EBG with an average value of 35dBuV/m. New EBG structure also exhibits low impedance which is less than one ohm over the stop-band for efficient prime power transfer.