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A Broadband Microwave Metamaterial Absorber with Octave Bandwidth

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Abstract

In this paper, a broadband metamaterial absorber has been presented for practical applications. The unit cell of the proposed structure comprises metallic patch of single circular split-ring imprinted on top surface of a metal-backed dielectric substrate. The geometrical dimensions of the structure have been optimized in such a way that the structure exhibits broadband absorptivity response of 9.12 GHz from 6.70 to 15.82 GHz with more than 90 % absorptivity. Three distinct absorption peaks are observed at 7.16, 10.74 and 14.96 GHz. The absorption phenomena at these three frequencies have been analyzed and the roles of several geometrical parameters involved in the design are investigated. The proposed structure has been studied under oblique incidence, both for TE and TM polarizations where it shows wideband absorption characteristics up to 30° incident angle for TE polarization and 45° incident angle for TM polarization. The proposed structure is very thin (~λ/8.4 with respect to the centre frequency of absorption bandwidth) compared to the commercially available microwave absorbers.

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Acknowledgement

The author wants to acknowledge Dr. Kumar Vaibhav Srivastava and Mr. Saptarshi Ghosh of Electrical Engineering Department, IIT Kanpur for their support to conduct experimental part.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, Indian Institute of Information Technology, Allahabad, 211012, India

    Somak Bhattacharyya

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  1. Somak Bhattacharyya
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Correspondence to Somak Bhattacharyya.

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Bhattacharyya, S. A Broadband Microwave Metamaterial Absorber with Octave Bandwidth. MAPAN 31, 299–307 (2016). https://doi.org/10.1007/s12647-016-0180-6

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