This study proposes a unitized arc‐shaped frequency selective surface for achieving broadband absorption. The design is three‐layered with the unit cell of each layer being a combination of four identical arcs. The structure possesses a broad absorbing bandwidth along with high absorption. Its absorbing capability is more than 90% in the range of 3.87–10.49 GHz and exceeds 95% in the range of 5.65–10.35 GHz, thus covering the whole C‐band and most of the X‐band. In addition, the structure is insensitive to polarization and retains reasonable properties at an oblique incidence angle of 45°. A sample absorber is processed and tested, which according to the results operates from 3.68 to 10.25 GHz with an absorption capacity of over 80% and a working bandwidth of up to 94.3%.