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Bandwidth enhancement of transformation optics-based cloak with reduced parameters

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An Erratum to this article was published on 09 June 2015

Abstract

In this paper, dispersive cloak design with broad bandwidth and minimal scattering cross section is proposed by appropriately selecting a radial permeability for each shell in a discretized reduced cloak. The dispersive medium is constructed by artificially varying the inner radius of the cloak with frequency, and this variation results into unique material properties at every frequency. The variation of inner radius of the cloak with frequency is artificial since the actual physical dimension of inner radius remains invariant. The relation between bandwidth and geometrical parameters of cloak is obtained by ensuring that transformation media must satisfy the condition that group velocity must remain less than the speed of light along every direction for a finite frequency range. The proposed cloak provides \(8.9\,\%\) bandwidth with respect to the center frequency for \(50\,\%\) reduction in total scattering cross section, and at the design frequency, the minimum scattering cross section obtained is \(0.266\). The proposed dispersive cloak design is verified by numerical full-wave simulations results which also confirm good cloaking performance.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur, India

    Archana Rajput & Kumar Vaibhav Srivastava

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  1. Archana Rajput
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  2. Kumar Vaibhav Srivastava
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Correspondence to Archana Rajput.

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Rajput, A., Srivastava, K.V. Bandwidth enhancement of transformation optics-based cloak with reduced parameters. Appl. Phys. A 120, 663–668 (2015). https://doi.org/10.1007/s00339-015-9235-8

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  • DOI: https://doi.org/10.1007/s00339-015-9235-8

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