[en] In this letter, we propose a method of extending the bandwidth of radar absorbing materials (RAMs) by integrating the metasurface and an impedance-matching lattice. The metasurface operates at lower frequencies and is sandwiched as an interlayer between a RAM sheet and an impedance-matching lattice. Absorption at lower frequencies will be enhanced due to the strong resonance of the metasurface, which extends the bandwidth to lower frequencies. To enhance absorption at higher frequencies, a square lattice of RAM patches, rather than a complete sheet, is placed on top of the metasurface to improve the impedance matching. As well as the dissipation of the RAM patches themselves, a high absorption at higher frequencies can also be achieved, which extends the bandwidth towards higher frequencies. Therefore, through such an integrated design, a high absorption of radar waves can be achieved in an ultra-wide band. To verify this method, we designed, fabricated and measured a prototype based on a commercial magnetic rubber RAM. Both the simulated and measured results show that the prototype can achieve an absorption rate of over 90% on average in 2.5–18.0 GHz. Moreover, such a design not only maintains the softness of rubber RAMs, but also reduces the total aerial density, which will facilitate practical applications. This work provides an alternative method for designing microwave absorbers for ultra-wideband applications. (letter)