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Broadening of Cloaking Bandwidth by Passive and Active Techniques

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Transformation Electromagnetics and Metamaterials

Abstract

This chapter deals with the most serious drawback of transformation electromagnetic-based cloaking devices: narrow operating bandwidth (BW). It is shown that the maximal operating BW of every passive cloak is limited by the basic background physics (so-called energy-dispersion constraints). It is also shown possible to optimize the cloak parameters in order to achieve either the maximal BW or the maximal invisibility gain (IG). Finally, it is shown possible to go around the dispersion-energy constraints by inclusion of non-Foster active components, and to achieve a very broad operating BW that fairly exceeds the BW of passive cloaks.

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Authors and Affiliations

  1. Faculty of Electrical Engineering and Computing, University of Zagreb, Unska 3, HR-10000, Zagreb, Croatia

    Silvio Hrabar, Zvonimir Sipus & Iva Malcic

Authors
  1. Silvio Hrabar
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  2. Zvonimir Sipus
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  3. Iva Malcic
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Correspondence to Silvio Hrabar .

Editor information

Editors and Affiliations

  1. The Pennsylvania State University, Electrical Engineering East 211A, University Park, 16802, USA

    Douglas H. Werner

  2. University of Massachusetts Amherst, Natural Resources Road Marcus 201 100, Amherst, 01003, USA

    Do-Hoon Kwon

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Hrabar, S., Sipus, Z., Malcic, I. (2014). Broadening of Cloaking Bandwidth by Passive and Active Techniques. In: Werner, D., Kwon, DH. (eds) Transformation Electromagnetics and Metamaterials. Springer, London. https://doi.org/10.1007/978-1-4471-4996-5_12

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  • DOI: https://doi.org/10.1007/978-1-4471-4996-5_12

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  • Print ISBN: 978-1-4471-4995-8

  • Online ISBN: 978-1-4471-4996-5

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