Novel Multilayer Electromagnetic Bandgap Structure with Simultaneously Surface-Wave Suppression in the L, S, C and X-bands

In this work, a multiband Electromagnetic Bandgap (EBG) unit-cell (UC), that provides surface-wave suppression in the L, S, C and X-bands, is presented. The proposed design makes use of a group of 2×2 dual-band slotted mushroom UC-EBG, that are resonant at the C-band (5.2 GHz) and X-band (9.6 GHz), to create a tri-band UC-EBG that achieves an additional bandgap at S-band (3.2 GHz). Consequently, a geometrical arrangement of 2×2 tri-band UC-EBG are short-circuited to a single-band mushroom UC, that is resonant at L-band (1.5 GHz), leading to a multilayer UC-EBG structure with quad-band performance. The presented work is thoroughly validated making use of several simulation approaches, in which the different dual-band, tri-band and quad-band EBG configurations are analyzed. The proposed UC-EBG enables, with a single unit-cell design, and without using reconfigurable elements, the simultaneous suppression of surface waves in the L, S, C, and X frequency bands, becoming particularly suitable for multifrequency applications.