Penta Band Polarization Insensitive Metamaterial Absorber for EMI/EMC Reduction and Defense Applications

Abstract

In this paper, a low profile polarization insensitive penta-band planer metamaterial microwave absorber for C, X, Ku and Ka band is proposed. The used unit cell is a low profile double annular ring resonator printed on the top of a continuous metal backed substrate. The proposed absorber is measured in anechoic chamber for its absorption response. The measured bandwidth with more than 90 % absorption is 0.15 GHz, 0.21 GHz, 0.19 GHz, 0.35 GHz and. 891 GHz at absorption resonant frequency 5.91 GHz, 11.14 GHz, 14.28 GHz, 17.61 GHz and 36.8 GHz respectively. The proposed absorber is polarization insensitive to TE and TM polarized incidence of electromagnetic wave with wide measured angular stability up to 45°. The absorber is insensitive to oblique incidence of EM wave up to measured angular stability of 30°. The simulated and measured results are in good agreement.