Abstract
A square octagon split ring resonator (SOSRR) based six-band polarization-insensitive metamaterial absorber (MMA) with a high effective medium ratio (EMR), and excellent absorption is proposed in this study. It can be utilized as an S, C, X, and Ku band frequency absorber and as a sensor at 3.34 GHz (S-band). A unique patch has been introduced in the proposed unit cell to achieve high polarization insensitive properties with excellent absorption of 76 %, 82 %, 92 %, 99 %, 98 %, and 98 % respectively under S, C, X, and Ku band frequency spectrum. The distinctive features of this proposed SOSRR unit cell are its simple, unique structure with a high EMR value of 11.12, and polarization-insensitive up to 90° at 3.34, 5.08, 7.95, 11.68, 14.26, and 15.89 GHz respectively. The designed MMA unit cell is fabricated on a loss FR-4 dielectric substrate with an electrical dimension of 0.089λ0 × 0.089λ0. Measurement of absorption value for the unit cell and array structure performance verified by experiment with excellent agreement. The suggested MMA is very attractive for refractive index sensing applications due to several features, including its low profile, excellent angular stability, polarization insensitivity, sensitivity (S), quality factor (QF), and EMR value.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: Not applicable.
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