Multi-Resonant Unit Cell for Efficient Smart Electromagnetic Skins

Recently, passive Smart Electromagnetic Skins (SESs) have gained popularity for their capability to enhance the performance of a communication system without increasing its complexity. Since the focus was initially on the design of the structure at the whole, less attention was paid to the effects that the unit cell used for discretizing the surface itself has on the SES performance, just making a distinction between the use of resonant or sub-wavelength elements. Conversely, in this communication a multi-resonant unit cell is introduced and some preliminary numerical results on its application to the design of a smart skin are shown: they confirm its effectiveness and capability to improve the performance of the SES in comparison with other unit cells.