STRUCTURE

摘要

A structure, and a method for modifying the design of a structure, are provided such that the structure comprises features designed to reduce and preferably minimise the radar cross-section of the structure over one or more predetermined frequency ranges. Preferably, a structure is provided having an inclined surface, wherein the angle of inclination is selected for which the level of radar cross section is below a local maximum in the sidelobes in each of the scattering patterns of incident electromagnetic radiation at frequencies within one or more predetermined frequency ranges. In the particular case of a tower, for example of a wind turbine, the radar cross-section of the tower may be minimised for two or more radar bands by appropriate selection of the angle of inclination of a frusto-conical portion of the tower. Ideally, the tower is constructed entirely in the form of a cone frustum.