Novel Method to Broaden the Stop-band Width of the Mushroom-like Electromagnetic Band Gap Structure

According to the equivalent circuit of the mushroom-like Electromagnetic Band Gap (EBG) structure, a novel method of inserting the Inter-Digital Capacitor (IDC) to broaden the bandwidth of the stop-band is proposed in this paper. The T-shaped IDC EBG structure is designed to prove the correction and validity of the method. Compared with the mushroom-like EBG, the -30 dB stop-band of the proposed structure is broadened from 6.1 GHz to 7.1 GHz and the lower corner frequency is decreased from 0.9 GHz to 0.29 GHz. It is implemented by increasing the number of planes of IDC and decreasing the thickness of cell without changing the area of EBG cell. The results of the simulation show that the presented TIDC EBG is fit for Simultaneous Switching Noise (SSN) suppression.