A novel wide-band cascaded EBG structure with chip capacitors loading

This paper presents a novel compact wide-band electromagnetic bandgap (EBG) structure utilizing cascaded mushroom-like structures with and without chip capacitors loading. Direct transmission method is used to determine the band-gap of the EBG structure. The effects of loading capacitors between the neighboring metal patches on the EBG properties are investigated. The units loaded with and without capacitors are cascaded to form a wide-band EBG structure with the band widths of almost 70% The simulation and experimental results show that the overall bandgap covers the stopbands produced by the two original uniform structures. The concept of the cascaded EBG structure demonstrated here can be extended to electrically controlled wide-band structures, which would permit more optional stopbands by using electrically tuned capacitors.