Abstract
A novel dual-band wide-angle ultra-thin absorber composed of dual closed-concentric ten-point stars with polarization independence is presented in this article. The ten-point stars formed resonators are engraved on low cost FR4 substrate. The EM absorber performance is studied in terms of electrical and physical parameters. The polarization independence is practically demonstrated using waveguide measurement method. The measured results are in good agreement with simulated results. The absorbance values of 99.37% and 97.18% are achieved at 2.13 GHz and 2.52 GHz, respectively. The presented absorber design is wide-angle RF absorber with high absorbance values of about 80% up to 60° under TE mode and 87% up to 75° of oblique incidence angle for TM mode excitations. The experimental results demonstrate the absorption effectiveness of the proposed design to be utilized in RF energy harvester modules for capturing ambient UMTS band signals and in RF absorber applications for S band radar systems. The presented absorber unit cell is ultrathin and compact with the thickness and size less than λ/56 mm and λ/5 mm, respectively, at lowest absorption frequency.
Highlights
Owing to the exceptional properties of metamaterials (MTM), introduced by Victor Veselego in 1968 [1], many researches based on MTM have been carried out in recent past
metamaterial absorber (MMA) design has been studied for the polarization independence and the experimental demonstration is performed by using waveguide measurement technique [28]
The RF absorption performance of a wide-angle ultrathin microwave metamaterial absorber with the polarization independence has been evaluated in this article
Summary
Owing to the exceptional properties of metamaterials (MTM), introduced by Victor Veselego in 1968 [1], many researches based on MTM have been carried out in recent past. Numerous ultrathin compact MMAs have been reported having multiband/broadband response without using stacking of unit cells [24,25,26]. A wide-angle microwave MMA with the polarization independence has been presented. RF absorption performance of the designed structure is evaluated by varying various electrical as well as physical parameters for the proper selection of unit cell design based on the requirement of bandwidth and frequency. MMA design has been studied for the polarization independence and the experimental demonstration is performed by using waveguide measurement technique [28]. A good agreement between the numerically computed results and measured results makes the proposed MMA structure a good candidate for capturing ambient UMTS band signals in the RF energy harvester modules and RF absorber in Sband radar system applications.
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