A hybrid MoM/FDTD approach for an efficient modeling of complex antennas on mobile platforms

Thiel, W.; Sabet, K.F.; Katehi, L.P.B.

doi:10.1109/euma.2003.341054

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…The scattered fields in the MoM domain are computed directly in the time‐domain, and combined with the FDTD update equations at the separation interface(s). The previous techniques are different from the hybrid technique presented herein since the previous techniques do not utilize the novel dipole moment–based MoM type formulation for arbitrarily shaped objects with fine features. Also, the previous techniques do not combine the MoM solution with the FDTD domain update equations at the separation interfaces directly in the time‐domain as implemented in the hybrid technique presented herein.…”

Section: Introductionmentioning

confidence: 99%

“…The hybrid technique in Chakarothai et al is used for dosimetry analysis of a small animal in the reverberation chamber, and this technique does not combine MoM and FDTD solutions in the time‐domain. The hybrid technique in Thiel et al utilizes Huygens' surfaces for MoM/FDTD hybridization, and the hybrid technique in Huang et al is based upon the equivalence principle.…”

Section: Introductionmentioning

confidence: 99%

“…However, the closed-form expressions in Mittra et al 3 do not provide scattered fields directly in the time-domain without the inverse Fourier transform (IFT) operation, and repeated computations are required at each frequency sample to compute the scattered fields over a desired frequency band, thus requiring the IFT operation to obtain the time-domain scattered fields at the desired observation point(s). Several MoM/finite-difference time-domain (FDTD) hybrid techniques [4][5][6][7][8] have been discussed in the literature in the past. The hybrid technique in Padhi et al 4 The paper introduces a novel hybrid technique to analyze multiscale problems directly in the time-domain.…”

Section: Introductionmentioning

confidence: 99%

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Novel techniques for numerically efficient solution of multiscale problems in computational electromagnetics

Sharma

Mittra

2019

Int J Numerical Modelling

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Multiscale problems in numerical electromagnetics are becoming increasingly common with the advent and widespread usage of compact mobile phones, body area networks, small and nano antennas, sensors, high‐speed interconnects, integrated circuits, and complex electronic packaging structures, to name just a few commercial applications. Numerical electromagnetic modeling and simulation of structures with multiscale features are highly challenging due to the fact that electrically small as well as large features are simultaneously present in the model that demands for discretization of the computational domain such that the number of degrees of freedom is very large, thus levying a heavy burden on the computational resources. The multiscale nature of a given problem also exacerbates the challenge of generating very fine meshes that do not introduce instabilities or ill‐conditioned behaviors. In this paper, we present novel techniques for an efficient solution of multiscale problems in the time‐domain. The proposed techniques handle arbitrarily shaped objects with fine features by using the dipole moment–based method of moments (MoM) type formulation in the MoM domain and electrically large objects in the finite‐difference time‐domain (FDTD) domain. Scattered fields in the MoM domain are obtained in closed forms and directly in the time‐domain at the desired observation points on a planar interface, which are combined with the conventional FDTD update equations. The time‐domain scattered fields computed by using the MoM formulations presented herein are stable in their implementation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel techniques for numerically efficient solution of multiscale problems in computational electromagnetics

Sharma

Mittra

2019

Int J Numerical Modelling

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“…Next, the spatial distributions of the electric and magnetic fields on S are calculated from this current in a conventional manner and equivalent current sources on the Huygens surface are related to these fields through the equivalence principle theorem [5]. Once the equivalent sources are known, the fields "illuminating" the scatterer are derived from these sources [9], [11], [12]. Then, the FDTD algorithm is executed for field components inside the FDTD computational domain.…”

Section: Introductionmentioning

confidence: 99%

Efficient Evaluation of Equivalent-Principle Sources in MoM-FDTD Hybrid Method by Employing Spatial Interpolation and Adaptive Sampling

Topa

Karwowski

2007

2007 IEEE International Symposium on Electromagnetic Compatibility

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MoM-FDTD hybrid approach requires the information to be exchanged forth and back between the MoM-regions and the FDTD-regions coupled through the Huygens' surfaces. For electrically large structures, evaluation of the electric and magnetic field components and related equivalence-principle sources on the Huygens' surfaces can represent a significant (even dominant) fraction of the total solution time required for the problem. In this paper, we demonstrate a possibility of increasing computational efficiency of the MoM-FDTD hybrid method by employing spatial interpolation combined with adaptive sampling in calculating the electric and magnetic field components and the effective sources on the Huygens' surfaces. Numerical examples show that the proposed approach offers a considerable CPU time saving.

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“…The methods of numerical calculation include Mom [1][2], FDTD [3], FEM, and combination of various methods [4][5]. The Mom causes complex calculation when analyzing the object of electrically large size, the FDTD is not fit to deal with vehicle body model with curved surface, and the FEM can effectively save storage space and computation time for the analysis of large size object.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Effect of Carrier Platforms on Electromagnetic Characteristics of Multi-antenna

Zhang¹,

Wang²

2017

dtcse

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The effect of the locomotive roof environment on multi-antenna electromagnetic compatibility is an important issue in wireless communication. This paper is intended to build different platform models of multi-antenna and then analyze mutual interference roundly between antennas in different carrier platforms in order to focus on the effect of working performance of interference antennas to the target antenna, and the variation trend of antenna coupling and gain direction maps of the system with times of distance changing between antennas. The analysis and results can be used as a means or basis for multi-antenna system designing and the analysis tool of electromagnetic compatibility.

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A hybrid MoM/FDTD approach for an efficient modeling of complex antennas on mobile platforms

Cited by 6 publications

References 3 publications

Novel techniques for numerically efficient solution of multiscale problems in computational electromagnetics

Novel techniques for numerically efficient solution of multiscale problems in computational electromagnetics

Efficient Evaluation of Equivalent-Principle Sources in MoM-FDTD Hybrid Method by Employing Spatial Interpolation and Adaptive Sampling

An Analysis of the Effect of Carrier Platforms on Electromagnetic Characteristics of Multi-antenna

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