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$\mathbf{L}, \mathbf{S}, \mathbf{C}$and X-bands, is presented. The proposed design makes use of a group of$2 \times 2$dual-band slotted mushroom UC-EBG, that are resonant at the$\mathbf{C}$-band$(5.2 \text{GHz})$and X-band$(9.6 \text{GHz})$, to create a tri-band UC-EBG that achieves an additional bandgap at S-band (3.2 GHz). Consequently, a geometrical arrangement of$2 \times 2$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$\mathrm{L}, \mathrm{S}, \mathrm{C}$, and X frequency bands, becoming particularly suitable for multifrequency applications.