Scattering of Electromagnetic Waves by a Coated Dielectric Spheroid

Cooray, M.F.R.; Ciric, I.R.

doi:10.1163/156939392x00021

Cited by 26 publications

(6 citation statements)

References 15 publications

(12 reference statements)

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“…They were interested in computation scattering by disc-shaped silver halide crystals in gelatin to investigate scattering of photographic emulsions. The spheroidal expansion method can also be applied to coated spheroids [42,43], represented by a silicate particle with a non-absorbing cladding. For a spheroid illuminated by a shaped beam, Barton [44] applied an electromagnetic approach generalizing Asano's work.…”

Section: Spheroidal Expansionmentioning

confidence: 99%

A Review of Elastic Light Scattering Theories

Wriedt

1998

Part. Part. Syst. Charact.

162

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Mie scattering is an important tool for diagnosing microparticles or aerosol particles in technical or natural environments. Mie theory is restricted to spherical, homogeneous, isotropic and non-magnetic particles in a non-absorbing medium. However, as microparticles are hardly ever spherical or homogeneous, there is much interest in more advanced scattering theories. During recent decades, scattering methods for non-spherical and non-homogeneous particles have been developed and even some computer codes are readily available. Extension of Mie theory covers coated spheres, stratified spheres and clustered spheres. For homogeneous non-spherical particles such as spheroids, ellipsoids and finite cylinders, surface discretization methods have been developed. Scattering by inhomogeneous particles may be computed by volume discretization methods.

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Section: Spheroidal Expansionmentioning

confidence: 99%

A Review of Elastic Light Scattering Theories

Wriedt

1998

Part. Part. Syst. Charact.

162

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“…However, in contrast with the simpler aforementioned geometries of the metallic or dielectric spheroids, where various techniques were used to solve the problem, in this case, the methodology is common in all works, i.e., the separation of variables and expansions in terms of the spheroidal eigenvectors. More particularly, Cooray and Ciric in [25], and Li et al in [26], computed the scattering where the dielectric coating is lossy or lossless. Farafonov et al in [27] studied the problem in a slightly different way.…”

Section: Introductionmentioning

confidence: 99%

Fast Solution of the Electromagnetic Scattering by Composite Spheroidal–Spherical and Spherical–Spheroidal Configurations

Zouros

Kolezas

Roumeliotis

2015

IEEE Trans. Microwave Theory Techn.

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The electromagnetic scattering of a plane wave by composite spheroidal-spherical and spherical-spheroidal configurations is studied in this work. The spheroidal-spherical configuration consists of a spheroidal dielectric shell coating a spherical metallic core, while the spherical-spheroidal configuration consists of a spherical dielectric shell coating a spheroidal metallic core. Initially, the formal series solution is constructed by using analytical expansions connecting the spheroidal with the spherical eigenvectors. The solution of the problem is then obtained following two independent paths: first, asymptotic expansions are applied on all related quantities leading to a solution for the fields and the scattering cross sections, which is given by closed-form expressions, and is valid for small eccentricities of the spheroid. Second, the formal full-wave series solution is solved numerically by truncation. Both the full-wave and the closed-form solutions are validated by numerous comparisons with numerical simulations. The accuracy of the closed-form solution is then compared to the full-wave solution. The closed-form solution has very low computational cost. The spheroid can be one of prolate or oblate type. Both TE and TM incidence are studied and numerical results are given for various values of the parameters.Index Terms-Closed form, electromagnetic scattering, full wave, scattering cross sections, spheroids. 0018-9480

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“…Spheroidal wave functions are special functions in mathematical physics [21] which have many applications [22,23], especially in the analysis and design of antennas [24][25][26][27], since spheroidal antennas can be used to model many antenna shapes, from wire/cylindrical antennas via spherical antennas to disk antennas. And the fullwave analyses of the spheroidal antennas coated with a confocal radome are presented in [26].…”

Section: Introductionmentioning

confidence: 99%

Efficient Electrically Small Prolate Spheroidal Antennas Coated With a Shell of Double-Negative Metamaterials

Huang¹,

Tan²

2008

PIER

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Abstract-An efficient, electrically small prolate spheroidal antenna coated with confocal double-negative (DNG) metamaterials (MTMs) shell is presented. The radiation power of this antenna-DNG shell system excited by a delta voltage across an infinitesimally narrow gap around the antenna center is obtained using the method of separation of the spheroidal scalar wave functions. Our results show that this electrically small dipole-DNG shell system has very high radiation efficiency comparing with the normal electrically small antenna due to the inductive effect of the MTMs shell that cancel with the capacitive effect of the electrically small antenna. It is found that the spheroidal shell can achieve more compact structure and higher radiated power ratio than the corresponding spherical shell. This dipole-DNG shell systems with different sizes are analyzed and discussed.

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Scattering of Electromagnetic Waves by a Coated Dielectric Spheroid

Cited by 26 publications

References 15 publications

A Review of Elastic Light Scattering Theories

A Review of Elastic Light Scattering Theories

Fast Solution of the Electromagnetic Scattering by Composite Spheroidal–Spherical and Spherical–Spheroidal Configurations

Efficient Electrically Small Prolate Spheroidal Antennas Coated With a Shell of Double-Negative Metamaterials

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