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A wideband, thin, dual-negative, and polarization-independent square-tooth circular ring resonator-based metamaterial absorber for Ku-band applications

Published online by Cambridge University Press:  16 February 2024

Ramesh Amugothu Open the ORCID record for Ramesh Amugothu [Opens in a new window]  and
Vakula Damera
Ramesh Amugothu*
Affiliation:
Department of ECE, National Institute of Technology Warangal, Telangana, India
Vakula Damera
Affiliation:
Department of ECE, National Institute of Technology Warangal, Telangana, India
*
Corresponding author: Ramesh Amugothu; Email: ar720057@student.nitw.ac.in
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Abstract

In the proposed paper, a novel design and realization of a wide-band, oblique angle-insensitive metamaterial absorbers are presented. The absorber is designed to work over a wide range of frequencies, making it suitable for Ku-band applications. To get wide band absorption, a novel SM-shaped design with a square-tooth circular ring resonator structure is designed efficiently. The unit cell structure is designed with a dielectric substrate (FR4) with a thickness of 3.2 mm (0.16λ0), where λ0 is the wavelength of free space. The novel design of this configuration leads to wideband absorption with respect to a conventional absorber. Several physical parameters are also investigated, such as the dielectric constant, permittivity, permeability, impedance, and negative refractive index. The simulation and experimental results show from 13.60 to 16.14 GHz with 99.1% absorption, which is excellent agreement. The analysis of the proposed design indicates that it possesses the remarkable feature of being insensitive to polarization while also exhibiting high absorption even when the angle of incidence varies. For both the simulation and experiment, results are consistent with a frequency range of 13.60–16.14 GHz for normal incidence. Almost perfect absorption works well for solar cells, EM detection, and imaging applications.

Keywords

double negative characteristicsmetamaterialpolarization-insensitivetransverse electric modetransverse magnetic modewideband absorber
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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Copyright
© The Author(s), 2024. Published by Cambridge University Press in association with The European Microwave Association.

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