Polarization Insensitive and Wide-Incident Angle Stability Wideband Absorber Based on Resistive film for S and C bands

The absorptivity is more than 90% from 2.41 to 8.47 GHz with an absorption bandwidth is 6.06 GHz and fractional bandwidth is 111.39%. The unit size and thickness of the proposed structure are $0.120 \lambda_{L}$ and $0.078 \lambda_{L}$. The absorptivity of the proposed structure is constant above 90% at different polarization angles under normal incident angle due to the symmetric structure. So, it is polarization insensitive. The absorptivity of the proposed structure is above 80% upto angle 50° under an oblique angle. The proposed structure normalized input impedance for impedance matching theory was calculated using $S_{11}$ values. Explain the electric field and equivalent circuit model to better understanding the absorption mechanism. Compare the proposed structure with the previous absorber in terms of unit size, thickness and fractional bandwidth.