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Angle-independent wideband metamaterial microwave absorber for C and X band application

Published online by Cambridge University Press:  06 June 2023

Chetan Barde Open the ORCID record for Chetan Barde [Opens in a new window] ,
Neelesh Kumar Gupta ,
Prakash Ranjan ,
Komal Roy  and
Rashmi Sinha
Chetan Barde*
Affiliation:
Department of Electronics and Communication Engineering, Indian Institute of Information Technology Bhagalpur, Bihar, India
Neelesh Kumar Gupta
Affiliation:
Department of Electronics and Communication Engineering, Ajay Kumar Garg Engineering College, Ghaziabad, Uttar Pradesh, India
Prakash Ranjan
Affiliation:
Department of Electronics and Communication Engineering, Indian Institute of Information Technology Bhagalpur, Bihar, India
Komal Roy
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Jamshedpur, Jharkhand, India
Rashmi Sinha
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Jamshedpur, Jharkhand, India
*
Corresponding author: Chetan Barde; Email: 2017rsec004@nitjsr.ac.in
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Abstract

In this article, an angle-independent wideband metamaterial microwave absorber (MMA) for C (4–8 GHz) and X (8–12 GHz) band frequency is presented. The unit cell of the proposed MMA consists of outer and inner structure associated with lumped resistors. The outer structure consists of rectangular split-ring resonator, whereas the inner structure consists of circular split-ring resonator. The structure is made up of three layers, in which top and bottom layers are made up of copper acting as a conducting material. The middle layer is made up of FR-4 acting as a dielectric substrate. The resonating structure at the top is designed in such a way that wideband absorption is achieved in the range from 6.11 to 13.52 GHz. The wideband absorption within the range approaches almost unity having a bandwidth of 7.41 GHz. Three different peaks are considered in the range of interest having maximum absorption of 0.94, 0.94, and 0.99 at frequencies of 6.76, 11.15, and 13.07 GHz, respectively. The structure is analyzed with respect to the effective parameters, i.e., effective permittivity (${\varepsilon _{{\textrm{eff}}}}$) and effective permeability (${\mu _{{\textrm{eff}}}}$), to prove that the structure acts as a metamaterial. Electric field and current distribution are plotted at three different peaks to prove the mechanism of wideband absorption. Normal and oblique incidence are plotted to determine that the structure is behaving as an angle independent. The simulated structure is fabricated on FR-4 substrate and measured inside an anechoic chamber. Finally, to prove the novelty of the work, the proposed structure is compared with the already reported MMA. The proposed MMA finds practical applications in radar cross section reduction, terrestrial communication, keyless entry system, space communication, radar, and baby monitor.

Keywords

angle independentlumped resistormetamaterial microwave absorbernormal incidenceoblique incidence
Type
Metamaterials and Photonic Bandgap Structures
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Special Issue 1: MMS 2022 Special Issue , February 2024 , pp. 101 - 109
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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