Abstract
Recently, Ranjan et al. [A novel ultrathin wideband metamaterial absorber for X-band applications. J Electromagn Waves Appl. 2019;33:2341–2353. DOI:10.1080/09205071.2019.1681299] have designed a wideband metamaterial absorber for X-band applications. In this comment, we demonstrate that a linear reflective polarization converter is erroneously interpreted as a wideband metamaterial absorber by Ranjan et al. They have shown that the proposed structure is a metamaterial absorber due to the ignorance of cross-polarized component of the reflected wave. Furthermore, we have shown that due to anisotropic geometry and high cross-polarization of the reflected wave, the proposed design is a cross-polarization converter.
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