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Comment on “Size-efficient metamaterial absorber at low frequencies: Design, fabrication, and characterization” [J. Appl. Phys. 117
, 243105 (2015)]
B. X. Khuyen, B. S. Tung, N. V. Dung, Y. J. Yoo, Y. J. Kim, K. W. Kim, V. D. Lam, J. G. Yang, and Y. P. Lee, J. Appl. Phys. 117, 243105 (2015).
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In a recent article, Khuyen et al. [J. Appl. Phys. 117, 243105 (2015)] proposed a metamaterial perfect absorber (MPA) with a self-asymmetric structure and claimed that it could produce dual-band “perfect absorption.” In this report, we demonstrate that the self-asymmetric structure is not a true MPA. The cross-polarization reflection, which is induced by coupling between the induced magnetic field and the incident electric field, is ignored in calculation of absorptivity of that structure. The real absorption rate of this structure is below 60%, which indicates that the structure cannot be called a perfect absorber.
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