FDTD/Tdpo Hybrid Approach for Analysis of the Em Scattering of Combinative Objects

Liu, Y.; Ge, Debiao; Wei, Bing

doi:10.2528/pier07071206

Cited by 34 publications

(28 citation statements)

References 12 publications

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“…The finite difference time-domain (FDTD) method has been widely used in electromagnetic field numerical algorithm [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] due to its excellent characteristics such as wide applicability, ability to deal with non-uniform media and capability to acquire wideband information with one time calculation combined with Fourier transformation. The electromagnetic problem containing thin layers can be solved basically in three ways: (1) To divide the volume into small enough cells. Although this is a rigorous technique, it is computationally extremely demanding, since very small cells are needed inside electrically dense objects to resolve the spatial variations of the electromagnetic fields.…”

Section: Introductionmentioning

confidence: 99%

A General FDTD Algorithm Handling Thin Dispersive Layer

Wei¹,

Zhang²,

Dong³

et al. 2009

PIER B

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Abstract-A novel general technique for treating electrically thin dispersive layer with the finite difference time domain (FDTD) method is introduced. The proposed model is based on the modifying of the node update equations to account for the layer, where the electric and magnetic flux densities are locally averaged in the FDTD grid. Then, based on the characteristics that the complex permittivity and permeability of three kinds of general dispersive medium models, i.e., Debye model, Lorentz model, Drude model, the permittivity and permeability can be formulated by rational polynomial fraction in jω; the conversion equation from frequency domain to time domain (i.e., jω replaced by ∂/∂t) and the shift operator method are then applied to obtain the constitutive relation at modified electrical points, and the time-domain recursive formulas for D and E, B and H available for FDTD computation are obtained. Several numerical examples are presented, indicating that this scheme possesses advantages such as fine generalization, EMS memory and time step saving, and good precision.Corresponding author: B. Wei (bwei@xidian.edu.cn). 244Wei et al.

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Section: Introductionmentioning

confidence: 99%

A General FDTD Algorithm Handling Thin Dispersive Layer

Wei¹,

Zhang²,

Dong³

et al. 2009

PIER B

Self Cite

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“…Next, we appoint to each region, a parameter, β mt i,j,k , as an instruction of the distance from the first/last cell to the physical position of the wall relative to cell dimensions [22]. Evidently, β mt i,j,k belongs to [0, 1/2] and satisfies β A i,j,k = 0.5 − β B i,j,k .…”

Section: The Convergent Treatment Of Arbitrarily-aligned Materials Intmentioning

confidence: 99%

“…For complex-combined objects including a SS and LS parts, using Time Domain Physical Optics (TDPO) [21,22] is suitable technique for coupling between two regions. This paper develops a numerical method that combines higher order FDTD (HOFDTD) with TDPO for the scattering problem by Complex and combinative objects, in which the coupling must be considered by any means.…”

Section: Introductionmentioning

confidence: 99%

Time Domain Physical Optics for the Higher-Order FDTD Modeling in Electromagnetic Scattering From 3-D Complex and Combined Multiple Materials Objects

Faghihi¹,

Heydari

2009

PIER

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Abstract-This paper proposes a hybrid methodology that combines an extended form of Finite-Deference Time-Domain (FDTD) method with Time Domain Physical Optics (TDPO) for analysis of 3-D scattering of combinative objects in complex electromagnetic compatibility (EMC) problems. Establishing a covariant formulation for FDTD, the extended algorithm introduces a parametric topology of accurate nonstandard schemes for the non-orthogonal div-curl problem and the suppression of lattice dispersion. For complex-combined objects including a small size (SS) and large size (LS) parts, using TDPO is an appropriate approach for coupling between two regions. Thus, our technique solves the EMC complexity with the help of higher order FDTD (HOFDTD) and the combinatory structures by using the TDPO. Numerical validation confirms the superiority of the proposed algorithm via realistic EMC applications.

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“…Besides methods in frequency domain, analysis of wide-band reflected signals directly in time domain [37][38][39][40][41][42] began to emerge since time-domain physical optics (TDPO) was proposed by Sun [25] in 1994. Most of PO and GO-based high frequency methods in both frequency and time domain have been implemented and used widely, except timedomain version of iterative physical optics which considers multiple scattering directly in time domain.…”

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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FDTD/Tdpo Hybrid Approach for Analysis of the Em Scattering of Combinative Objects

Cited by 34 publications

References 12 publications

A General FDTD Algorithm Handling Thin Dispersive Layer

A General FDTD Algorithm Handling Thin Dispersive Layer

Time Domain Physical Optics for the Higher-Order FDTD Modeling in Electromagnetic Scattering From 3-D Complex and Combined Multiple Materials Objects

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

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