Spray antennas or spray-on antennas consist of conductive material that is dissolved in a liquid in such a way that it can be sprayed onto shaped, non-conductive materials.
Because the spray-on layer is extremely thin, has no weight and is not bulky, spray-on antennas are suitable for flexible smart wearables, medical wearables and small mobile devices such as tracking equipment.
Spray-on antennas can be applied with a spray gun or airbrush. The spray material is a conductive metallic compound dissolved in a liquid. The inorganic compound researched for this purpose is called MXene. Titanium carbide is used as the starting material, which is sprayed in an extremely thin layer of a few nanometers. The thickness of the sprayed layer determines the optimal antenna parameters. Thus, the highest antenna performance is achieved at a thickness of a few micrometers.