  Metamaterials have great potential to construct ultrathin, miniaturized, and
cost-effective microwave and optical devices for future wireless communication
systems. Here, a dual-band meta-absorber comprising four arrows-shaped unit
cells is investigated. The absorption features are numerically studied and
analyzed in a microwave frequency spectrum from 28 - 36 GHz. The proposed
meta-absorber illustrates the two independent absorption peaks of 96% and
99.99% at the corresponding operating points of 31.11 GHz and 33.77 GHz,
respectively, within the 5G spectrum. Due to structure symmetry, the proposed
meta-absorber exhibits insensitive polarization performance under the influence
of different polarization angles of the incoming EM waves. The absorption
characteristics of the absorber are also analyzed for different obliquity of
the incident EM waves, and their absorption peaks are tuned under these
operating conditions. Further, to realize the absorption behavior of this
absorbing device, the surface electric field profile and current distributions
are also studied at the aforementioned two operating frequency points. This
absorber type remains prudent to minimize the coupling and cross-talk between
the elements of the MIMO antenna operating in the 5G band.
