Dual band polarization-insensitive wide angle metamaterial absorber for radar application

In this paper, an ultra-thin dual-band polarization-insensitive metamaterial absorber with wide-angle characteristics has been presented. The unit cell geometry comprises two circular rings with the inner one cross-connected. Simulated results show two discrete absorption peaks at 2.90 GHz (S-band) and 6.13 GHz (C-band) with absorptivities of 99.66% and 99.83% respectively, which can be used for surveillance and air defense radar applications. The proposed structure is polarization-insensitive and shows high absorption (over 80%) for wide incident angles upto 60 degree for both TE and TM polarizations. The proposed structure has been fabricated and measured, showing good agreement with the simulated responses.