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Objectives In order to improve the performance of traditional absorbing materials, a high-absorptivity broadband absorber is designed. Methods The absorber consists of a resistive film, dielectric substrate and metal ground plate. The element unit of the resistive film is composed of a Jerusalem cross unit and outer square loop. Results The simulated results indicate that the absorption of the designed absorber is more than 90% in the frequency range of 2.9–5.1 GHz, and an absorptivity peak of 99.4% can be achieved. Absorption performance can also be maintained in wide-angle cases and polarization-insensitive cases. Conclusions The absorber proposed in this paper has significance for the design and application of broadband absorbers.