Physical Optics Analysis of Multiple Interactions in Large Scatters Using Current Modes

Cátedra, M.F.; Delgado, Carlos; Luceri, S.; Blanco, Oscar Gutiérrez; Adana, Francisco Sáez de

doi:10.1109/tap.2006.869893

Cited by 23 publications

(9 citation statements)

References 14 publications

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“…For example, the iteration process can be stopped after a pre-specified number of reflections based on the number of expected significant reflections supported by a given model. For general complex objects, shadowing will have to be taken into account in (2). As noted already, only cases without shadowing are considered here.…”

Section: A the Mrpo Methodsmentioning

confidence: 99%

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Acceleration of multiple reflection physical optics scattering analysis with the MLFMM

Xiang

Botha

2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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The physical optics (PO) approximation is com monly used for scattering analysis of electrically large, conducting objects. The standard PO approximation is purely local and does not take multi-bounce effects into account. The multiple reflection PO (MRPO) method takes multiple reflections into account in an iterative manner. In this paper the mesh-based MRPO with standard RWG basis functions on triangle elements is considered. In cases where shadowing can be pre-specified based on physical insight, the main computational bottleneck is the integration over the currents to obtain the next reflection's contribution to the surface current. It is shown that the multilevel, fast multi pole method (MLFMM) can be used to accelerate these calculations significantly, while yielding essentially identical results as the MRPO with conventional integration. Index Terms-Computational electromagnetics; recursive up date; radar cross section (RCS); magnetic field integral equation (MFIE).

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Section: A the Mrpo Methodsmentioning

confidence: 99%

“…The physical optics (PO) approximation is commonly used for scattering analysis in such cases [1], [2]. The standard PO approximation is purely local and does not take multi-bounce effects into account.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of multiple reflection physical optics scattering analysis with the MLFMM

Xiang

Botha

2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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“…Following Eqs. (31) and (32), the frequency and angular samples are determined by the parameter R which is the radius of the sphere that circumscribe the scatterer. Based on the relationship between adjacent levels via Eq.…”

Section: Phase Compensation and Interpolationmentioning

confidence: 99%

“…In [30][31][32], the PO currents can be represented as current mode which can be characterized by the amplitude and the quadratic phase functions that vary slowly over large integration domain. Then, the PO scattered field can be computed from the surface PO currents.…”

Section: Introductionmentioning

confidence: 99%

The Multilevel Fast Physical Optics Method for Calculating High Frequency Scattered Fields

Z.M.Xue¹,

Wu²,

Chew³

et al. 2020

PIER

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“…When the electrical size of objects are on the order of hundreds or thousands of working wavelength λ, that is, the essential frequencies k of the wave field are high enough, the physical optics (PO) approximation has been accepted as an efficient approach for analyzing the scattering and radiation electromagnetic problems [2][3][4][5][6][7][8][9][10][11][12][13][14][16][17][18][19], which was suggested by Macdonald [4] early in 1913. The PO current on a scattering surface lit region is defined by j (s) PO (r) = 2 ∂u (i) (r) ∂n , j (h) PO (r) = 2u (i) (r),…”

Section: Introductionmentioning

confidence: 99%

An Efficient Method for Computing Highly Oscillatory Physical Optics Integral

Jiang

Chew

2012

PIER

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Abstract-In this work, we use the numerical steepest descent path (numerical SDP) method in complex analysis theory to calculate the highly oscillatory physical optics (PO) integral with quadratic phase and amplitude variations on the triangular patch. The Stokes' phenomenon will occur due to various asymptotic behaviors on different domains. The stationary phase point contributions are carefully studied by the numerical SDP method and complex analysis using contour deformation. Its result agrees very well with the leading terms of the traditional asymptotic expansion. Furthermore, the resonance points and vertex points contributions from the PO integral are also extracted. Compared with traditional approximate asymptotic expansion approach, our method has significantly improved the PO integral accuracy by one to two digits (10 −1 to 10 −2 ) for evaluating the PO integral. Moreover, the computation effort for the highly oscillatory integral is frequency independent. Numerical results for PO integral on the triangular patch are given to verify the proposed numerical SDP theory.

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Physical Optics Analysis of Multiple Interactions in Large Scatters Using Current Modes

Cited by 23 publications

References 14 publications

Acceleration of multiple reflection physical optics scattering analysis with the MLFMM

Acceleration of multiple reflection physical optics scattering analysis with the MLFMM

The Multilevel Fast Physical Optics Method for Calculating High Frequency Scattered Fields

An Efficient Method for Computing Highly Oscillatory Physical Optics Integral

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