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

Abstract

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 0.0795λl, where λl 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.