Analysis of a novel Metamaterial Absorber using equivalent circuit model operating at 3.5 GHz

This paper demonstrates a closed meander line shaped metamaterial absorber operation at 3.5 GHz WiMAX band. The proposed metamaterial absorber unit cell has a compact size of 0.11λ
º
X 0.11 λ
º
design on an ultrathin FR-4 substrate with thickness 0.018 λ
º
, where λ
º
is the wavelength corresponding to operating frequency. The proposed absorber shows an absorptivity of 98.5% at the intended frequency. An equivalent circuit model is also defined to depict the electrical properties of the structure. The proposed design also shows insensitivity to polarization as well as change in incident angle of the wave over a wide-angle (upto 60°) for both TE and TM polarization. The proposed structure is a good candidate for radar cross section reduction of an antenna.