This paper investigates an FSS-based, wide-band, polarization-insensitive, and lightweight EM wave absorber. The proposed design consists of four number of arrow shaped FSS patterns along with SMD resistors printed on 0.25 mm thin Duroid substrates. The top substrate is separated from the bottom side of the structure by an air spacer that is 5.5 millimeters thick. The bottom side of the structure is complete metal. The proposed design offered a wide absorption bandwidth of 14.9 GHz (5.8 – 20.7 GHz). The presented FSS unit cell has a surface area of 0.19λLg × 0.19λLg and a thickness of 0.108λL, where λLg is wavelength at 5.8 GHz. In this case, the thickness of the suggested structure is 5.6 millimeters, which is extremely close to the Razonov limit. The simulation results demonstrate that the designed FSS absorbs EM wave from 5.8 to 20.8 GHz band with angular stability of 50° for both polarizations. In addition to angular stability, the suggested design is polarization insensitive in the working band. The presented structure is also studied for its RCS, and to demonstrate its real time application in RCS reduction, the RCS (mono and bi-static) of the absorber structure is calculated and compared with the metal sheet’s RCS of the same size. Here, the absorption mechanism inside the proposed FSS is further exploited with the help of input impedance plot, E-field, and surface current distribution.