Evaluation of edge-diffracted fields including equivalent currents for the caustic regions

Ryan, C.; Peters, L.

doi:10.1109/tap.1969.1139445

Cited by 176 publications

(36 citation statements)

References 6 publications

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“…High frequency methods such as physical optics (PO), geometrical optics (GO) [26], geometry theory of diffraction (GTD) [27], uniform theory of diffraction (UTD) [28,29], physical theory of diffraction (PTD) [30], method of equivalent currents (MEC) [31][32][33] and Equivalent edge currents (EEC) [34] have been applied to scattering analysis of large target. To model the problem of multiple scattering or coupling between different regions of the object, iterative physical optics (IPO) [35,36] is employed to study scattering problem such as open-ended cavity.…”

Section: Time-domain High Frequency Theory For Combinative Targetmentioning

confidence: 99%

Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Li¹,

Wei²,

He³

et al. 2011

PIER

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Abstract-In this paper, time-domain physical optics (TDPO) method is extended to its iterative version (TDIPO) to consider the coupling effects between two regions, and the latter is employed to investigate electromagnetic scattering from three dimensional target half-buried by a two dimensional rough surface. By using iterative scheme, more accurate transient response reflected from combinative target with multi-scattering effects would be obtained than that by using TDPO alone. The TDIPO could also be enhanced by time-domain equivalent edge current (TDEEC) to further determine the far-field characteristics of the combinative target with rough surface. An accurate composite geometry model technique which combines 2D perfectly electrically conducting (PEC) rough surface and half-buried 3D PEC target is introduced and employed to assist the meshing work. The validity of the presented method is verified by comparing the scattering results for dihedral targets with those obtained through TDPO and finite difference in time domain (FDTD), as well as multi-level fast multiple algorithm (MLFMA). Then simulations of EM scattering from the target embedded in rough surface for different incidence directions are carried out to test the availability of TDIPO/EEC. Discussions on the effects of incidence direction and the presence of the target on the backscattering in farzone are also given.

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Section: Time-domain High Frequency Theory For Combinative Targetmentioning

confidence: 99%

Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Li¹,

Wei²,

He³

et al. 2011

PIER

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“…J y (−x, y) = J y (x, y) and J y (x, −y) = J(x, y). Thus, starting with the double series of polynomials x i y j and modifying the series from the knowledge of the current stated above [17], the basis function for the unknown current distribution is taken as:…”

Section: Formulation Of the Circular Disk Problemmentioning

confidence: 99%

“…The third category presenting similar accuracy as PTD belongs to Geometrical Theory of Diffraction (GTD) [12,13]. Several modifications to this technique have been introduced by other researchers such as Uniform Geometrical Theory of Diffraction (UGTD) by Kouyoumijian and Pathak [14], Uniform Asymptotic Technique by Lee & Deschamps [15], and High-Order Geometrical Theory of Diffraction by Bechtel [16], Ryan & Peters [17] and by Marsland et al [18]. The fourth category is the Method of Moments (MoM) [1] and last category its Hybrid variants such as Hybrid Asymptotic Moment Method by Kaye, Murthy and Thiele [19,20].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Integration Technique for the Analysis of Electromagnetic Scattering From Conducting Surfaces

Mishra¹,

Gupta²

2008

PIER

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Abstract-A new numerical method is proposed for the analysis of electromagnetic scattering from conducting surfaces. The method involves Monte Carlo integration technique in the Method of Moments solution of the Electric Field Integral Equation for determining the unknown induced current distribution on the surface of the scatterers. The unknown current distribution is represented in terms of a modified entire domain polynomial basis functions satisfying the appropriate edge conditions and symmetry conditions of the problem. This leads to very small order of the Method of Moments matrix as compared to the conventional sub-domain basis functions. The accuracy and the effectiveness of the method are demonstrated in three cases of scattering from conducting circular disks and results are compared with the solutions using conventional sub-domain basis functions. While the sub domain analysis is incapable of handling large domain problems, the proposed method overcomes this limitation. It is also observed that the proposed method is superior to conventional sub-domain method in dealing with singularity problem of the integral equation easily and efficiently.

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“…Recently a uniform theory was also put forward for the diffraction of evanescent plane waves [6]. The method of equivalent currents was developed by the efforts of Ryan et al [7], Knott et al [8,9] and James et al [10] in order to obtain a valid field expression for the caustic regions. In the method of equivalent currents, an infinitesimal current element, which is related with the incident field, is defined that flows along the diffracting edge of the scatterer.…”

Section: Introductionmentioning

confidence: 99%

Rigorous Expressions for the Equivalent Edge Currents

Umul

2009

PIER B

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Abstract-An exact form for the equivalent edge current is derived by using the axioms of the modified theory of physical optics and the canonical problem of half-plane. The edge current is expressed in terms of the parameters of incident and scattered rays. The analogy of the method with the boundary diffraction wave theory is put forward. The edge and corner diffracted waves are derived for the problem of a black half-strip.

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Evaluation of edge-diffracted fields including equivalent currents for the caustic regions

Cited by 176 publications

References 6 publications

Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Monte Carlo Integration Technique for the Analysis of Electromagnetic Scattering From Conducting Surfaces

Rigorous Expressions for the Equivalent Edge Currents

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