Abstract:The influence of Electromagnetic Band-Gap (EBG) structure on signal transmission is investigated in this paper. The signal integrity in time domain and frequency domain is analyzed by HFSS and S parameter model. The simulation results show that the signal reflection and filter are induced by periodic structure, signal quality is affected seriously .The smaller period is, the worse signal quality is. Finally, the design rules for high-speed circuit in EBG structure are derived from the results obtained.