Abstract: A tile for reducing a radar wave reflection from a surface, the tile being a flexible surface sheet which is adhesively attachable to the surface, wherein the flexible surface sheet reduces the radar wave reflection from the surface at a frequency, the frequency being a frequency between 1 GHz and 12 GHz; and, wherein the flexible surface sheet is a laminate of layers, wherein at least one of a top surface and a bottom surface of the flexible surface sheet is adapted to be adhesively attachable to the surface, and wherein the laminate of layers comprises: a first layer comprising a polymer matrix into which a particulate filler is dispersed, wherein the particulate filler has radar absorbing properties; a second layer comprising a polymer matrix, the second layer adjoining the first layer, wherein the polymer matrix of at least one of the first and the second layer is thermoplastic polyurethane.

Abstract: A wind turbine component, the wind turbine component comprising a laminate of layers with an outer side and an inner side, wherein the outer side faces an exterior of the wind turbine component and the inner side faces an interior of the wind turbine component, the laminate of layers being configured to reflect a radar wave impinging the outer side of the laminate of layers, wherein a reflection loss of the reflected radar wave is below a threshold at a frequency, the laminate of layers comprising: an attenuating layer comprising reinforcing fiberglass or reinforcing carbon fibers, a polymer matrix, and radar absorbing particles; a reflective layer arranged on the inner side of the attenuating layer, the reflective layer being configured to reflect a transmitted portion of the radar wave, the transmitted portion of the radar wave being a portion of the radar wave that has passed through the attenuating layer.

Abstract: A tile for reducing a radar wave reflection from a surface, the tile being a flexible surface sheet which is adhesively attachable to the surface, wherein the flexible surface sheet reduces the radar wave reflection from the surface at a frequency, the frequency being a frequency between 1 GHz and 12 GHz; and, wherein the flexible surface sheet is a laminate of layers, wherein at least one of a top surface and a bottom surface of the flexible surface sheet is adapted to be adhesively attachable to the surface, and wherein the laminate of layers comprises: a first layer comprising a polymer matrix into which a particulate filler is dispersed, wherein the particulate filler has radar absorbing properties; a second layer comprising a polymer matrix, the second layer adjoining the first layer, wherein the polymer matrix of at least one of the first and the second layer is thermoplastic polyurethane.

Abstract: A noise damper for reducing noise from a vibrating element which vibrates at a vibrational frequency, wherein the noise damper is configured to be in contact with the vibrating element such that when the noise damper is in contact with the vibrating element a noise amplitude at a point in a surrounding of the vibrating element is given by an attenuation factor times the noise amplitude at the point in the surrounding when the noise damper is disconnected from the vibrating element, the noise damper comprising: a polymer matrix, the polymer matrix being in a solid phase and forming a shape; a plurality of hollow particles dispersed in the polymer matrix, each hollow particle having a shell encapsulating a gas filled cavity, each hollow particle having a hollow particle size, and the plurality of hollow particles being dispersed at a hollow particle concentration in the polymer matrix; wherein the hollow particle size and the hollow particle concentration are configured to set the attenuation factor below an at