Elimination of infinities in equivalent edge currents, part I: Fringe current components

Michaeli, A.

doi:10.1109/tap.1986.1143913

Cited by 168 publications

(76 citation statements)

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“…For rigorous analysis of oblique edges it is necessary to use MEC with some kind of incremental length diffraction coefficients, which are correct for observation outside the Keller cone (5). Usually Mitzner's ILDC (5) have been chosen for this purpose in a number of RCS prediction codes but, on the other hand, they are singular for some observation directions (6). This problem has been overcome by Michaeli's ILDC (6), which remove most of the singularities of Mitzner's and, in particular, are finite for all monostatic observations.…”

Section: Incremental Length Diffraction Coefficientsmentioning

confidence: 99%

“…Usually Mitzner's ILDC (5) have been chosen for this purpose in a number of RCS prediction codes but, on the other hand, they are singular for some observation directions (6). This problem has been overcome by Michaeli's ILDC (6), which remove most of the singularities of Mitzner's and, in particular, are finite for all monostatic observations. The main drawback of Michaeli's ILDC is a rather complex formulation, even for the monostatic case, which makes real-time RCS prediction difficult for GRECO code.…”

Section: Incremental Length Diffraction Coefficientsmentioning

confidence: 99%

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Multiple reflections and improvement of edge scattering in GRECO RCS prediction code

Rius¹,

Vall-Ilossera²,

Jofre³

1993

23rd European Microwave Conference, 1993

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GRECO code for monostatic RCS prediction in real time has been extended by considering multiple reflections between surfaces and improving the edge diffraction coefficients. Multiple reflections are analysed through a very efficient ray-tracing algorithm based on the graphical processing technique. Method of equivalent currents for edge scattering has been improved by Mitzner's and Michaeli's incremental length diffraction coefficients (ILDC).This communication presents the general features of GRECO code, in particular the advantages of the new graphical processing technique. Emphasis will be placed in the new features of GRECO still unpublished: the ray-tracing algorithm and the implementation of incremental length diffraction coefficients. Graphical Electromagnetic Computing (GRECO)During the last four years, the development of graphical processing techniques for high-frequency monostatic RCS prediction has given rise to GRECO code (1), (2), (3). Real-time computation is achieved through graphical processing of an image of the target present at the screen of a workstation, using the hardware capabilities of a 3-D graphics accelerator. The two main advantages of the graphical processing approach over classical techniques are: a) Hardware graphics accelerator removes hidden surfaces and edges: they do not contribute to the surface or line integrals when they are performed by the graphical processing technique. b) Reduced CPU time and RAM requirements. They are independent of target electrical size and complexity. The main features of GRECO code are the following:a) The I-DEAS computer aided design package for geometric modelling of solids has been used for modelling target geometry. The target is described as a collection of parametric surfaces, defined with two-dimensional NURBS (non-uniform rational Bsplines). Parametric surfaces require less mass storage memory that the faceting approach, and adjust more accurately to the real target surface. b) Physical Optics (PO) approach for perfectly conducting surfaces and Impedance Boundary Condition (IBC) + Physical Optics for radar absorbent coatings. c) Method of Equivalent Currents (MEC) with either Physical Theory of Diffraction (PTD), Mitzner's or Michaeli's Incremental Length Diffraction Coefficients (ILDC) for perfectly conducting edges. A comparative study of the results for the three kinds of ILDC's will be presented in this communication.d) Double reflection analysis by geometric optics (GO) raytracing for the first reflection and bistatic physical optics for the second. A new and very efficient ray-tracing algorithm has been developed and will be also presented in this communication. Ray-TracingDouble reflections between surfaces are analysed by a hybrid GO-PO scheme. The GO reflection at the first surface assumes that specular reflection occurs, according to stationary phase principle. The PO reflection at the second surface ensures that the correct scattered field is obtained when there is no specular reflection to the observer.For each pixel on...

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Section: Incremental Length Diffraction Coefficientsmentioning

confidence: 99%

Section: Incremental Length Diffraction Coefficientsmentioning

confidence: 99%

Multiple reflections and improvement of edge scattering in GRECO RCS prediction code

Rius¹,

Vall-Ilossera²,

Jofre³

1993

23rd European Microwave Conference, 1993

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show abstract

“…Nas seções 5.5 a 5.6 e 5.7 são apresentados estudos de caso considerando o contorno objetivo circular, elíptico e super-elíptico. As superfícies refletoras modeladas são analisadas via aproximações daÓtica Física com correção das correntes de borda, considerando a antena operando em 0,9GHz, 1,8GHz e 7,2GHz [80], [81], [82]. Tambémé apresentada uma série de estudos de caso com objetivo de avaliar o algoritmo em diversas situações, deste as de mais fácil convergência em que a diferença entre o diagrama de radiação inicial e objetivoé pequenaàs de maior dificuldade em que essa diferençaé grande.…”

Section: Organização Do Trabalhounclassified

“…O método de interpolação determina estas constantes associadas ao polinômio e os coeficientes da série de forma que a diferença entre cada ponto dado pela síntese e o correspondente obtido através de (5-38) seja mínima. A validação da sínteseé feita através de análise da superfície interpolada via aproximações da PO mais correntes de borda [80], [81], [82]. A análise foi feita considerando a antena operando em 0,9GHz, 1,8GHz e 7,2GHz e, consequentemente, com diâmetros de 12λ, 24λ e 96λ.…”

Section: Cobertura Gaussiana Em Contorno Circularunclassified

“…O objetivoé verificar se os resultados gerados pelo método numérico de solução da equação de MongeAmpère são os esperados e validá-los através das aproximações daÓptica Física (PO-Physical Optics) com correção das correntes de borda [80], [81], [82]. Nas Seções 5.2 e 5.3 são apresentados os modelos de alimentador e campo distante utilizados nos estudos de caso apresentados.É assumido que o alimentador irradia uma frente de onda esférica com centro de fase na origem do sistema de coordenadas e a densidade de potência irradiada aproximada pelo modelo cosseno elevado a um expoente.…”

Section: Introductionunclassified

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Síntese De Antenas Refletoras Utilizando Seções Cônicas E Superfícies Quádricas Confocais

PENCHEL¹

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An exact line integral representation of the physical optics field scattered from a penetrable planar structure illuminated by a plane wave

Toso

Martini

Pelosi

1999

Microw. Opt. Technol. Lett.

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Elimination of infinities in equivalent edge currents, part I: Fringe current components

Cited by 168 publications

References 24 publications

Multiple reflections and improvement of edge scattering in GRECO RCS prediction code

Multiple reflections and improvement of edge scattering in GRECO RCS prediction code

Síntese De Antenas Refletoras Utilizando Seções Cônicas E Superfícies Quádricas Confocais

An exact line integral representation of the physical optics field scattered from a penetrable planar structure illuminated by a plane wave

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