A Domain Decomposition Finite Difference Time Domain (FDTD) Method for Scattering Problem from Very Large Rough Surfaces

Lai, Zhi-Hong; Kiang, Jean‐Fu; Mittra, R.

doi:10.1109/tap.2015.2466466

Cited by 30 publications

(12 citation statements)

References 33 publications

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“…is the mutual-impedance matrix between Ω i and Ω j as expressed in Equation 6. N denotes the number of subdomains.…”

Section: Domain Decomposition Strategymentioning

confidence: 99%

“…In order to alleviate the aforementioned constraints, the use of domain decomposition method (DDM) is becoming an important mean that research groups worldwide are currently employing. Lou and Jin, Lai et al, and Zheng et al have proved its ability in solving complex EM problems when the targets are located in free‐space. However, they cannot satisfy the needs for solving actual engineering problems where the half‐space environment must be taken into account.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integral equation‐based nonoverlapping domain decomposition method for electromagnetic scattering analysis of PEC targets in half‐space environment

Zhao

Lin

2019

Int J Numerical Modelling

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An integral equation‐based nonoverlapping domain decomposition method (IE‐NDDM) is proposed for efficient and accurate scattering analysis of electrically large PEC targets in a half‐space environment. Taking the condition that there are null fields as well as current inside PEC objects in the original problem, a novel explicit transmission condition is proposed to ensure continuity of electric currents between adjacent subdomains. Moreover, to deal with this situation that targets located in half‐space environment, the stratified‐medium dyadic Green's function is adopted. Numerical examples are provided to demonstrate the correctness and the performance of the proposed method. In detail, an analysis about electromagnetic scattering respect to the altitude of the target away from half‐space interface, the incident direction of plane wave, and the material parameters of the lower half‐space is presented; furthermore, the convergence behavior of the proposed method is studied.

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“…is the mutual-impedance matrix between Ω i and Ω j as expressed in Equation 6. N denotes the number of subdomains.…”

Section: Domain Decomposition Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integral equation‐based nonoverlapping domain decomposition method for electromagnetic scattering analysis of PEC targets in half‐space environment

Zhao

Lin

2019

Int J Numerical Modelling

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“…In order to improve performance of conventional FDTD in terms o f CPU time and memory, Zh i-Hong proposed in [19] a DD (Do main Deco mposition)-Laguerre -FDTD method to solve very large rough surface, PEC, lossy dielectric media, large scatterers. The computational domain is discretised into sub domains, radiated and scattered fields.…”

Section: Perfect Conductormentioning

confidence: 99%

Review on Computational Electromagnetics

Sumithra

Thiripurasundari²

2017

AEM

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Co mputational electro magnetics (CEM) is applied to model the interaction of electro magnetic fields with the objects like antenna, waveguides, aircraft and their environment using Maxwell equations. In this paper the strength and weakness of various computational electromagnetic techniques are deliberated in detail. Performance of various techniques in terms accuracy, memory and co mputation time for application specific tasks such as modeling RCS (Radar Cross Section), space Applications, thin wires and antenna arrays are presented in this paper. Co mmercial software codes has certain limitations, Agilent ADS could not model 3D structures, HFSS is accurate but execution time is h igh, WIPL-D ® does not support modeling Inhomogeneous dielectrics embedded metal objects and periodic structures. IE3D ® is not suited for geometry with fin ite details. However for regular shapes like rectangular patch MOM based IE3D provides accurate results than FEM based IE3D. The co mp licated structures are dealt with accuracy by using CST Microwave Studio ® and HFSS ® . Although CST and HFSS has similar interface in dealing with geo metry with fine details, CST had edge over HFSS software as it starts in time do main and ends in frequency domain. HFSS uses Finite Element Method (FEM ) to arrive at frequency domain solution. FEKO ® has two main solvers MOM based and GTD based. GTD based FEKO is good in handling large structures like reflector antennas.

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“…Moreover, the domain decomposition method is used for finite difference time domain (FDTD) method, and the coherent scattering field is obtained based on the reciprocity theorem. The FDTD method is also used to predict the three-dimensional reradiation fields of the entire tree, by combining the effects of the single elements forming the tree [11,12].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering of Rough Ground Surface Covered by Multilayers Vegetation

Yang

Luo

Yin

et al. 2019

International Journal of Antennas and Propagation

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A microwave scattering model is proposed for the ground surface covered with multilayers vegetation. The vegetation leaves are simulated with the discrete elliptical particles in layers, which are randomly distributed above the randomly rough surface. The finite element method is applied to solve the scattering magnetic field equation based on the Dirichlet boundary, and the relationship between the radar cross section and bidirectional reflectance distribution function is deduced with the coherent scattering field. The internal mechanism of microwave scattering of multilayers vegetation is explored with the numerical results, and the relationship of vegetation growing parameter with scattering characteristic is established.

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A Domain Decomposition Finite Difference Time Domain (FDTD) Method for Scattering Problem from Very Large Rough Surfaces

Cited by 30 publications

References 33 publications

Integral equation‐based nonoverlapping domain decomposition method for electromagnetic scattering analysis of PEC targets in half‐space environment

Integral equation‐based nonoverlapping domain decomposition method for electromagnetic scattering analysis of PEC targets in half‐space environment

Review on Computational Electromagnetics

Electromagnetic Scattering of Rough Ground Surface Covered by Multilayers Vegetation

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