On Electromagnetic-Acoustic Analogies in Energetic Relations for Waves Interacting with Material Surfaces

Dukata, A.; Kapelewski, J.

doi:10.12693/aphyspola.114.a-69

Cited by 4 publications

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References 2 publications

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“…They have a broad range of applications including artificial dielectrics, antenna structures, microwave components and composite materials. Applications of metamaterials in antenna design have been considered in recent years by several authors [1][2][3][4]. The electromagnetic analysis and optimization based on the effective medium approximations of artificial materials is very convenient since it deals with only a few bulk medium parameters instead of a large number of parameters fully describing a discrete structure.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Wave Behaviour in Uniaxial Magnetodielectric Media of 1+1>2 Type

Kapelewski

Dukata

2009

Acta Phys. Pol. A

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In the paper a phenomenological approach is proposed to polarized electromagnetic wave propagation in magnetodielectric media, composed of piezoelectric and magnetostrictive anisotropic monolayers. The composite materials consisting of a system of such bimorph films have recently attracted much interest, because they can exhibit a much stronger magnetoelectric effect in a wide temperature range than the single phase multiferroic materials. In the paper dispersion equations given in a common form for both TE and TM modes are derived for long wave approximation. The equations can be of use in evaluation of directional dependence for particular polarizations, which is of particular interest in designing substrate for miniaturized polarimetric antenna, especially useful for modern synthetic aperture radar systems.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Wave Behaviour in Uniaxial Magnetodielectric Media of 1+1>2 Type

Kapelewski

Dukata

2009

Acta Phys. Pol. A

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An analogical study of wave equations, physical quantities, conservation and reciprocity equations between electromagnetic and elastic waves

Zang 臧

2024

Chinese Phys. B

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This paper presents an analogical study between electromagnetic and elastic wave fields, with a one-to-one correspondence principle established regarding the basic wave equations, the physical quantities and the differential operations. Using the electromagnetic-to-elastic substitution, the analogous relations of the conservation laws of energy and momentum are investigated between these two physical fields. Moreover, the energy-based and momentum-based reciprocity theorems for an elastic wave are also derived in the time-harmonic state, which describe the interaction between two elastic wave systems from the perspectives of energy and momentum, respectively. The theoretical results obtained in this analysis can not only improve our understanding of the similarities of these two linear systems, but also find potential applications in relevant fields such as medical imaging, non-destructive evaluation, acoustic microscopy, seismology and exploratory geophysics.

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An Insight into Coherent Backscattering Evaluation Techniques of Prospective Use in High Frequency Polarimetric Radar Image Processing

Kapelewski

2010

Acta Phys. Pol. A

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Coherence in multiple scattering is important as it applies to imaging and detection of object in multiple scattering environments. These phenomena may also be used to investigate images of objects obscured by them. The scattering observations using very rough surfaces can provide useful insight into their statistic as they lie outside the range of validity of the standard theories. Recently, there has been growing interest in the phenomenon of backscattering enhancement in the reflection of electromagnetic waves of mm wave range from both atmospheric hydrometeors (rain, snow and precipitation) as well as very rough surfaces (including that of sea and terrain sea). Strong backscattering enhancement of mm waves incident at different incident angles, both in the TE and TM polarizations, was observed experimentally. In the paper a short description of specific techniques used for treating image processing of strongly irregular media is shortly presented. An emphasis is placed on the phenomena of interest in advanced polarimetric radar especially in mm wave range.PACS numbers: 41.20.Jb, 03.50.De Backscattering enhancementBackscattering enhancement phenomena have been observed for many years. It has been sometimes called the "retroreflectance" or the "opposition effect".Recently, more quantitative experimental and theoretical studies of the enhancement have been reported. Watson in [1] noted that the backscattered intensity is twice the intensity of the sum of incoherent multiple scattering and the first-order scattering. De Wolf in [2] showed that the backscattered intensity from turbulence is proportional to the fourth-order moment and approximately twice the multiple scattered intensity.It was explained in [3] that the enhanced peak is caused by the constructive interference of two waves traversing through the same particles in opposite directions. Physicists have also recognized that the transport of electrons in a strongly disordered material is governed by multiple scattering and that multiple scattering leads to "weak Anderson localization" caused by "coherent backscattering". It is then shown that both electron localization in disordered material and electromagnetic (EM) wave localization in disordered materials are governed by coherent backscattering (CB) which is caused by the constructive interference of two waves traversing in opposite directions. One I l corresponds to the wave multiply scattered through many particles, called the "ladder term". The other I c corresponds to two waves traversing through the * corresponding author; e-mail:jerzy.kapelewski@wel.wat.edu.pl same particles in opposite directions. This is called the "cyclical" or the "maximally crossed" term and has the same magnitude as I l in the back direction, but diminishes away from the back direction (Fig. 1). The essence of this division will be highlighted in Sect. 3. Also two waves scattered off the sloped surface interfere constructively in the back direction producing the enhanced peak. The angular width is relatively broad and appro...

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On Electromagnetic-Acoustic Analogies in Energetic Relations for Waves Interacting with Material Surfaces

Cited by 4 publications

References 2 publications

Electromagnetic Wave Behaviour in Uniaxial Magnetodielectric Media of 1+1>2 Type

Electromagnetic Wave Behaviour in Uniaxial Magnetodielectric Media of 1+1>2 Type

An analogical study of wave equations, physical quantities, conservation and reciprocity equations between electromagnetic and elastic waves

An Insight into Coherent Backscattering Evaluation Techniques of Prospective Use in High Frequency Polarimetric Radar Image Processing

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