A novel compact EBG structure for multi-band wireless communication

A novel compact multi-band Electromagnetic Band Gap (EBG) structure is introduced in this paper. Through etching four identical F-shaped slots on the surface of conventional mushroom-shaped EBG (CMT-EBG) structure, which is spiral and symmetrically distributed about the centre of EBG surface, the equivalent current path is extended while producing four resonant circuits. The simulated results present that the novel EBG structure generates four band-gaps near the resonant frequencies (1.43 GHz, 3.54 GHz, 5 GHz and 7.28 GHz). The resonant frequency (1.43 GHz) of the first band-gap reduced by 40.4% compared with the CMT-EBG of same size, which realizes the comprehensive design of miniaturization and multi-band. The novel EBG structure is simple, easily integrating with microwave circuits and suitable for multiband application in wireless communication systems where a compact size is desired.