Ultra-Thin Wideband Polarization-Insensitive Metasurface Absorber for Aviation Technology
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https://doi.org/10.1007/s11664-020-08386-2 Ó 2020 The Minerals, Metals & Materials Society
Ultra-Thin Wideband Polarization-Insensitive Metasurface Absorber for Aviation Technology YOGITA KHANNA1 and Y.K. AWASTHI
1,2,3
1.—Department of Electronics and Communication Engineering, Manav Rachna University, Faridabad, Haryana 121004, India. 2.—Department of Electronics and Communication Engineering, Manav Rachna International Institute of Research and Studies, Faridabad, Haryana 121004, India. 3.—e-mail: [email protected]
In this paper, an ultra-thin (ko/10) single-layer wideband metasurface absorber is proposed with absorption more than 90% throughout the bandwidth from 10 to 15 GHz. The geometry of the unit cell of the absorber consists of diagonal splits in a square-shaped ring loaded with a square patch in the center. The absorber is fabricated using 35-lm copper cladding over 1.6-mmthick FR-4 dielectric substrate. The simulated results are in good agreement with the measured results. Hence, the designed absorber is found to be applicable to recent aviation technology. Key words: Microwave absorber, broadband absorber, split-ring resonator, aviation
INTRODUCTION Metamaterials are artificial materials having properties such as permittivity, permeability, and refractive index tailored electromagnetically in such a manner that cannot be achieved naturally.1–5 Owing to the unconventional properties, researchers have a great inquisitiveness in the field of artificial materials along with the stability of the chemical composition of microwave components, since a temperature rise and oxidization occur during the operation.6,7 The state-of-the-art technology of metamaterials has revealed numerous applications in the domain of radio-frequency (RF) and microwave engineering like antennas, cloaks, sensors, and absorbers.8–16 Electromagnetic absorbers are one of the most widely used applications in modern technology to mitigate electromagnetic interference by a radome and to minimize the radar cross-section.17–20 During World War II, Salisbury (single layer) and Jaumann (multilayer) absorbers were introduced for radar camouflage. At that time, it was the utmost research achievement in the field of electromagnetics. Although Dallenbach absorbers
(Received March 30, 2020; accepted July 31, 2020)
were used for wideband absorption, they are not popular today because of lossy magnetic materials, as they have large mass density.21 With recent technology, hexa-ferrites are also used for wideband absorption due to their exotic properties such as lightweight, thin and low reflectivity in contrast to conventional materials.22,23 Later, Salisbury, Jaumann and Dallenbach absorbers were also replaced by thin and light metamaterial and metasurface absorbers that have wide bandwidth.24–26 Metal composite layers with different thickness or resistive components have also been reported as good shields for electromagnetic radiation.27,28 This paper presents a unique and simple wideband metasurface absorber structure with a fraction
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