Electronics and wireless communication are all around us. Smartphones, microwave stoves, remote controls, and computers interconnected by WLAN are part of our daily life. All this electronic equipment emits electromagnetic radiation. Even within a unit, some components emit radiation which could upset the surrounding electronics. Where many components must be held on a minimum of space in one unit, or several units must be used at the same time, it is often necessary to attenuate radiation. However, common metal housings reflect a large part of the electromagnetic waves without achieving any attenuation. KIT scientists developed a coating for housings which attenuates electromagnetic radiation. This is achieved particularly well by so-called soft magnetic materials which are easy to magnetize and are permeated thoroughly by magnetic fields. These materials are deposited on a substrate as a thin coat. If so-called uniaxial anisotropy is subsequently induced in the plane of the coating, or if an additional external magnetic field is applied, directionality of the magnetic properties is produced in the coating. In the next step, the scientists make use of lithographic techniques to create a microstructure in the magnetic coat. A structure of this kind can consist, for instance, of tiny rectangles slightly protruding from the surface like tiles. If an electromagnetic wave hits this coated, structured surface, it penetrates into the material, transmitting part of its energy as heat into the solid lattice. The magnetic coating and structuring can be chosen in such a way that resonances occur, i.e. electromagnetic waves with specific frequencies are absorbed or attenuated particularly strongly. As many units emit radiation in the microwave range (2 - 2.5 gigahertz), coatings with high absorption and attenuation in this frequency range are particularly attractive. The KIT is looking for partners for further development and utilization of this technology.