Abstract
This letter provides correction comments to an article published in 2015, by Ghosh et al. in which the authors have proposed a circular-split-rings-based ultrawideband ultrathin metamaterial absorber and claimed 90% absorption between 7.85 to 12.25 GHz. It is found that the authors have misinterpreted a cross polarizer as a broadband absorber by neglecting its cross-polarized reflection. It is found that by incorporating the cross-polarized coefficient of the reflected wave, the absorption of the proposed structure gets below 20% over the complete claimed operating band. Additionally, the polarization conversion ratio is above 90%, which proves that the proposed structure is predominantly a cross polarizer rather than an efficient absorber.
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