A broadband wide angle metamaterial absorber for defense applications

This paper presents an ultra-thin metamaterial absorber with L-shaped patches placed diagonally at the top surface. The geometrical dimensions of the unit cell have been optimized in such a way that the structure shows broadband response in C-band. Furthermore, an absorption bandwidth of 2.6 GHz is realized with more than 90% absorptivity level ranging from 4.6 to 7.2 GHz. The proposed structure has been studied under oblique incidence, both for TE and TM polarizations where it shows wideband absorption upto 45 incident angles in both the cases. The structure is fabricated and the experimental results are in good agreement with the simulated responses.