Abstract
AbstractIn the recently published article, Ramya et al. (Microw Opt Technol Lett. 2017;59:1837–1845. https://doi.org/10.1002/mop.30636) proposed asymmetrical metamaterial absorber structure for wideband applications. It was shown that, the reported structure has wideband absorptivity (above 85%) from 10.36 to 16.67 GHz. It is demonstrated in this article that, the reported unit cell is not a metamaterial electromagnetic wave absorbing structure. It is found that, peak absorptivity is 37.6%, 26.5%, and 28.6% at frequencies 10.5, 13.9, and 16.2 GHz, respectively. The strong wideband absorption caused in the original article is due to ignorance of cross‐polarized reflections in the calculation of absorbivity rather than true absorption as authors claimed.
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