Comment on “Sliding planar conjoined cut-wire-pairs: A novel approach for splitting and controlling the absorption spectra” [J. Appl. Phys. 124, 105103 (2018)

Abstract

In a recent article, Al-Badri et al. [J. Appl. Phys. 124, 105103 (2018)] proposed a new method to split a single perfect absorption peak into two separate absorption spectra by using vertical sliding of conjoined cut-wire-pairs (CCWPs).The highest tuning of absorption bands are reported at frequencies 3.242 GHz and 3.640 GHz with absorptivity of about 90%. This comment expresses some concerns about the simulation environment and absorption characteristics of such an approach. Moreover, it is shown that the actual absorption peak is around 40% while simulated with periodic boundary conditions.