Potential applications of electromagnetic absorbers strongly increased over the past few years. Radar absorbing materials were mainly used for stealth applications in the past but are now also integrated in industrial processes (electromagnetic compatibility in RF systems, antennas…). Moreover, the strong development of wireless technologies has led to an increase in the human exposure to electromagnetic waves. This fact gives rise to new public health issues and house protection against electromagnetic radiations is thus a pretty hot topic. Potential applications of radar absorbers are nowadays numerous and new technologies have thus to be developed to answer to these growing needs. This project has two main objectives: i) ultra-thin absorbers for low frequency applications (<4 GHz) and ii) 3D absorbers or Frequency Selective Surfaces (FSS). The need in ultra-thin low-frequency absorbers concerns both military and civil engineering. Indeed, at these frequencies, the most efficient solutions consist in using ferrite ceramics (heavy and expensive) or loaded polymer foams (thick). Flexible magnetic composites can also be used but their absorption capacities are lower. This project proposes to design and fabricate ultra-thin absorbers thanks to the coupling of metasurfaces and composite materials. Considering the frequency band of interest (1-4 GHz), potential applications will concern not only stealthiness of military systems but also the house protection against radiations (GSM, Wifi, 3G, 4G) and a decrease of the electromagnetic interactions between civil radars and wind plants. The second objective of the project is to develop technological means for the realization of 3D absorbers and FSS. These 3D objects will be applied to electronic war (protection against electromagnetic attacks) or to electromagnetic compatibility issues (absorbent packaging for microwave devices). 3D printing of composite materials and 3D selective metallization processes will be used to realize the demonstrators.