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Materials 2018, 11(9), 1595; https://doi.org/10.3390/ma11091595

An Analytical Study of Electromagnetic Deep Penetration Conditions and Implications in Lossy Media through Inhomogeneous Waves

1
Department of Engineering, Roma Tre University, 00146 Rome, Italy
2
Department of Information Engineering, Electronics and Telecommunications (DIET), Sapienza University of Rome, 00184 Rome, Italy
3
National Transport Authority (NTA), Harcourt Lane, D02WT20 Dublin, Ireland
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 19 July 2018 / Revised: 22 August 2018 / Accepted: 27 August 2018 / Published: 3 September 2018
(This article belongs to the Special Issue Electromagnetic Wave Absorbing Structures)
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Abstract

This paper illustrates how the penetration of electromagnetic waves in lossy media strongly depends on the waveform and not only on the media involved. In particular, the so-called inhomogeneous plane waves are compared against homogeneous plane waves illustrating how the first ones can generate deep penetration effects. Moreover, the paper provides examples showing how such waves may be practically generated. The approach taken here is analytical and it concentrates on the deep penetration conditions obtained by means of incident inhomogeneous plane waves incoming from a lossless medium and impinging on a lossy medium. Both conditions and constraints that the waveforms need to possess to achieve deep penetration are analysed. Some results are finally validated through numerical computations. The theory presented here is of interest in view of a practical implementation of the deep penetration effect. View Full-Text
Keywords: lossy media; deep penetration; electromagnetic propagation in absorbing media; inhomogeneous waves; leaky waves lossy media; deep penetration; electromagnetic propagation in absorbing media; inhomogeneous waves; leaky waves
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Baccarelli, P.; Frezza, F.; Simeoni, P.; Tedeschi, N. An Analytical Study of Electromagnetic Deep Penetration Conditions and Implications in Lossy Media through Inhomogeneous Waves. Materials 2018, 11, 1595.

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