Broadband metamaterial absorber for stealth applications at K-band

This paper focuses on the design and analysis of a polarization-insensitive wide-angle broadband metamaterial absorber for stealth applications at the K band. The unit cell of the metamaterial absorber is comprised of a symmetrically arranged ladder shape geometry made of copper metal, which is impr...

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Bibliographic Details
Published in:International journal of electronics and communications 2023-10, Vol.170, p.154828, Article 154828
Main Authors: Dewangan, Laxmikant, Patinavalasa, Megh Sainadh, Acharjee, Juin, Solunke, Yogesh, Ghosh, Saptarshi, Mishra, Nipun Kumar
Format: Article
Language:English
Subjects:
Broadband
Compact
Electromagnetic absorber
Metamaterial
Oblique incidence
Polarization insensitive
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Summary:This paper focuses on the design and analysis of a polarization-insensitive wide-angle broadband metamaterial absorber for stealth applications at the K band. The unit cell of the metamaterial absorber is comprised of a symmetrically arranged ladder shape geometry made of copper metal, which is imprinted on a metal-backed FR-4 substrate. The structure shows more than 91% absorptivity ranging from 21.2 to 28.2 GHz for both transverse electric (TE) and transverse magnetic (TM) polarized waves under normal incidence. The topology is four-fold symmetric and yields polarization-insensitive responses for different angles of polarization under both TE and TM polarized waves. The structure is also investigated under oblique incidence where the 80% absorptivity holds up to 45° incident angles for both TE and TM waves. The absorption mechanism is explained with the help of top and bottom surface current distribution, induced electric field, and parametric analysis. To verify the resonances in the structure, characteristic mode, and equivalent circuit analysis have been carried out and presented. A prototype of the absorber has been fabricated and simulated results are validated with measured results. The novelty of the proposed absorber lies in its unique metallic pattern on a λ0/8 thin FR-4 substrate while showing the wide absorption bandwidth to normal and oblique incidence. All the above-mentioned attributes in a simple design make it commercially suitable for radar cross-section (RCS) reduction applications at the K band.
ISSN:1434-8411
DOI:10.1016/j.aeue.2023.154828