Design of a Low Profile Wideband Absorber Using Resistively Loaded Cross Dipole and Modified Square Loop

In this paper, a novel, low profile frequency selective surface (FSS) wideband circuit analog absorber is presented. The FSS unit cell consists of the cross-dipoles surrounded by a modified square loop, both loaded resistively. Fractional bandwidth of 122.96 % is achieved ranging from 2.08 - 8.72 GHz at normal incidence. The overall thickness of the proposed absorber is 0.0795λ
l
, where λ
l
is the wavelength corresponding to the lowest cutoff frequency. The design is symmetric and insensitive to polarization. Furthermore, the performance of the proposed absorber is stable up to 30° angle of incidence for both TE and TM polarizations.