International audience; In recent years, the potential of sound absorbing metamaterials as an alternative to traditional acoustic absorbers has been demonstrated in several publications. A common way to design these absorbing metamaterials, is through periodic arrangements of resonators. By combining acoustic resonators tuned to different resonance frequencies in each unit cell, the frequency range for which the material achieves high absorption can be extended. Nevertheless, there is limited research on the angle-dependent behavior of the latter type of absorbing metamaterials, when they are exposed to waves incident at oblique directions, which is highly relevant information for a large amount of practical applications, particularly in room acoustics. In this work, a finite element method (FEM) model is used, to study the behavior of an infinitely large 2D surface that consists of a periodic arrangement of Helmholtz resonators under oblique incident plane wave conditions. It is found that the incidence angle influence, not only the magnitude of the (maximum) absorption coefficient, but also the frequencies at which the maximum absorption coefficient is observed, as well as the absorption bandwidth.