A Dual-Band Mushroom EBG Structure with Inductive Via Coupling for Wideband Parallel-Plate Mode Suppression

A dual-band mushroom electromagnetic bandgap (EBG) structure with inductive via coupling is proposed in this paper, in which via coupling is first introduced to generate another new stopband. The principle of how to generate two stopbands is demonstrated by equivalent circuit models with two or more coupling LC series resonators through mutual inductance. Then, a new EBG structure with four-cell inductive via coupling is proposed. Full-wave simulated and measured results show that the four-cell coupling EBG structure introduces two continuous stopbands, which extend the power noise suppression stopband. Finally, an eight-cell via coupling EBG structure is developed to extend the stopband further.