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Experimental verification of super-compact ultra-wideband (UWB) polarization and incident angle-independent metamaterial absorber

Published online by Cambridge University Press:  15 September 2020

Manpreet Kaur
Affiliation:
Department of Electronics and Communication Engineering, Thapar Institute of Engineering and Technology, Patiala147 004, Punjab, India
Hari Shankar Singh*
Affiliation:
Department of Electronics and Communication Engineering, Thapar Institute of Engineering and Technology, Patiala147 004, Punjab, India
*
Author for correspondence: Hari Shankar Singh, E-mail: harishankar1990@gmail.com

Abstract

In this paper, a super-compact ultra-wideband (UWB) metamaterial absorber (MMA) is presented. The absorber design consists of an inverted L-shaped structure and a diagonal rectangular-shaped structure. The capacitive coupling between these two structures not only provides UWB nature but also provides a super-compact absorber design. The dimension of the unit cell arrangement is 5 × 5 mm2 and printed on a low-cost FR-4 substrate of thickness 1.54 mm (0.061λlowest). The design absorber provides more than 97% absorptivity from 12 to 21 GHz for normal incidence electromagnetic (EM) wave. However, the proposed MMA has a full width at half maximum absorption bandwidth of 11.71 GHz from 10.34 to 22.05 GHz. Moreover, the surface current distributions have been analyzed to understand the absorption mechanism of the MMA. The stability of the proposed design is validated with different incident angles (for TE and TM modes) and different polarization angles. Finally, the absorber design is fabricated and verified experimentally. Furthermore, the UWB frequency range, high absorption, ease in design and fabrication, and cost-effective make it suitable for different quality applications in stealth technology, thermal imaging, radar detection, antenna systems, and other EM devices.

Type
Metamaterials and Photonic Bandgap Structures
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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