Comment on “A novel ultrathin wideband metamaterial absorber for X-band applications”

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.

KEYWORDS:

• Polarization converter
• metasurface
• wideband metamaterial absorber

Acknowledgements

Simulation and paper writing was done by Saeed Ur Rahman and reviewed by Faisal Amin, Afzal Ahmed, Wang Yi and Qunsheng Cao. Professor Qunsheng Cao is thanked for providing the facilities.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Saeed Ur Rahman http://orcid.org/0000-0002-2479-0823

Additional information

Notes on contributors

Saeed Ur Rahman

Saeed Ur Rahman was born in 1989 and he received BS degree in electronics engineering from COMSAT University, Pakistan in 2013 and MS degree in electronics engineering from Capital University of Science and Technology (CUST), Pakistan in 2016. He is pursuing his PhD from Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing, China. His research interests include electromagnetics and antennas especially in the design and optimization of antenna array, micro-strip patch antennas, ultra wideband antennas and meta-material absorbers, FSS, polarization conversation.

Faisal Amin

Faisal Amin was born in 1983 and he received BS degree in Electrical communication engineering from UET Peshawar, Pakistan in 2003 and MS degree in electronics information engineering from Northwestern Polytechnical University (NPU) in 2013. He is pursuing his PhD from Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing, China. His research interests include electromagnetics, microwave components and phase shifters.

Afzal Ahmed

Afzal Ahmed was born in 1991 and he received BS degree in Computer Engineering from COMSATS University, Lahore Pakistan, in 2013 and MS degree in Electrical Engineering from COMSATS University, Abbottabad, Pakistan in 2017. He is pursuing his PhD from the Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing, China. His research interests include antennas and electromagnetics especially metamaterial absorbers, chiral metamaterials.

Wang Yi

Dr. Wang Yi (M’15) received the B.S. and Ph.D. degrees in communication and information system from the Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing, China, in 2006 and 2012, respectively. In 2012, he joined the College of Electronic and Information Engineering, NUAA, (and is continuing) as an Assistant Professor. His research interests include computational electromagnetics, especially the finite difference time-domain (FDTD) method, the FDTD modeling of the entire earth-ionosphere system, and the earthquake electromagnetics, and research focuses on the FDTD simulation of anisotropic media and earthquake phenomena.

Qunsheng Cao

Prof. Qunsheng Cao received the Ph.D. degree in electrical engineering from The Hong Kong Polytechnic University, Hong Kong, in 2000. From 2000 to 2005, he worked as a Research Associate with the Department of Electrical Engineering, University of Illinois at Urbana-Champaign and with the Army High-Performance Computing Research Center, University of Minnesota, USA. In 2006, he joined the Nanjing University of Aeronautics and Astronautics, China, as a Professor for electrical engineering. He has authored more than 190 academic papers in refereed international journals and conference proceedings. His current research interests include computational electromagnetics, microwave, and antennas technologies and radar signal processing. His research team is also engaged in high-speed circuit signal integrity, antenna, microwave components, and a new method in radar signal processing.