The invention discloses a light
broadband wave-absorbing material which is of a three-dimensional structure and comprises a reflecting layer and a
peripheral square ring wave-absorbing unit, the
peripheral square ring wave-absorbing unit is vertically arranged on the reflecting layer and forms a cavity structure with the reflecting layer, an inner square ring wave-absorbing unit which forms a self-similar structure with the
peripheral square ring wave-absorbing unit is arranged in the cavity structure, and an outer square ring wave-absorbing unit which forms a self-similar structure with the inner square ring wave-absorbing unit is arranged in the cavity structure. Gaps among the reflecting layer, the peripheral square ring wave-absorbing unit and the inner square ring wave-absorbing unit are filled with flexible wave-absorbing foam. According to the light
broadband wave-absorbing material provided by the invention, the square ring wave-absorbing units with self-similar structures form resistance rings arranged in an array, and the resistance rings can be coupled to generate response of an electric
dipole mode, so that electromagnetic
waves can enter the material as much as possible to be consumed and converted into
heat energy, the wave-absorbing efficiency is improved, and the wave-absorbing effect within the
frequency band range of 1-75GHz can reach-10dB; and meanwhile, the self-similar square ring unit structures are all cavity structures, so that the density of the material is effectively reduced.