An Improved Thin Wire Representation for FDTD Computations

Taniguchi, Yohei; Baba, Yoshihiro; Nagaoka, Naoto; Ametani, Akihiro

doi:10.1109/tap.2008.929447

Cited by 65 publications

(35 citation statements)

References 10 publications

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“…Figure 3 (b-c) shows the nonuniform mesh obtained for the simulation. Horizontal and vertical wires have been represented using the thinwire model proposed by (Noda & Yokoyama, 2002) and improved for a smaller radius, as is presented in (Taniguchi, Baba, Nagaoka, & Ametani, 2008).…”

Section: Experimental Validation For a Two-wire Crosstalk Set-upmentioning

confidence: 99%

Validation of a non-uniform meshing algorithm for the 3D-FDTD method by means of a two-wire crosstalk experimental set-up

Jiménez-Mejía¹,

Herrera-Murcia²

2015

ing.inv.

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This paper presents an algorithm used to automatically mesh a 3D computational domain in order to solve electromagnetic interaction scenarios by means of the Finite-Difference Time-Domain -FDTD-Method. The proposed algorithm has been formulated in a general mathematical form, where convenient spacing functions can be defined for the problem space discretization, allowing the inclusion of small sized objects in the FDTD method and the calculation of detailed variations of the electromagnetic field at specified regions of the computation domain. The results obtained by using the FDTD method with the proposed algorithm have been contrasted not only with a typical uniform mesh algorithm, but also with experimental measurements for a two-wire crosstalk set-up, leading to excellent agreement between theoretical and experimental waveforms. A discussion about the advantages of the non-uniform mesh over the uniform one is also presented. Keywords:Finite-difference time-domain (FDTD) method, non-uniform orthogonal mesh, thin-wire models, crosstalk effect. RESUMENEste trabajo presenta un algoritmo usado para enmallar automáticamente un dominio computacional 3D con el fin de solucionar escenarios de interacción electromagnética por medio del Método de Diferencias Finitas en el Dominio del Tiempo -FDTD. El algoritmo propuesto se ha planteado en una forma matemática general, donde es posible definir funciones convenientes de espaciado aplicadas a la discretización del espacio de simulación. Esto permite la inclusión de objetos pequeños en el método FDTD y el cálculo de variaciones detalladas del campo electromagnético en regiones especificadas del dominio de cálculo. Los resultados obtenidos mediante el método FDTD con el algoritmo propuesto se han contrastado no sólo con un algoritmo típico de enmallado uniforme, sino también con medidas experimentales para un montaje de diafonía de dos hilos conductores logrando una excelente concordancia entre las formas de onda teóricas y experimentales. Además, se presenta una discusión sobre las ventajas del enmallado no uniforme sobre el uniforme.Palabras clave: Método de diferencias finitas en el dominio del tiempo -FDTD, enmallado ortogonal no uniforme, modelos de conductores delgados, diafonía. Received

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Section: Experimental Validation For a Two-wire Crosstalk Set-upmentioning

confidence: 99%

Validation of a non-uniform meshing algorithm for the 3D-FDTD method by means of a two-wire crosstalk experimental set-up

Jiménez-Mejía¹,

Herrera-Murcia²

2015

ing.inv.

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“…5. The equivalent conductivities and are obtained from (1) as (12) where and are the cross-sectional areas corresponding to the and regions, respectively, given by (13) Using (12), effective conductivities and are expressed as (14) The derivation of effective conductivities for the remaining three geometries: (b), (c), and (d) in Fig. 2 follows the same simple lines as above and, for brevity, will not be shown in full detail here.…”

Section: (A) Casementioning

confidence: 99%

“…The use of effective parameters is typically preferred because of its ease of implementation and because it does not fundamentally modify the conditional stability of FDTD [9], [11]- [13], except for a change on the value of the Courant limit. Local, effective parameters are very useful to avoid excessive FDTD grid refinement in other contexts as well [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Locally-Conformal FDTD for Anisotropic Conductive Interfaces

Lee

Teixeira

2010

IEEE Trans. Antennas Propagat.

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Locally-conformal discretizations have been developed for the finite-difference time-domain (FDTD) method to mitigate staircasing errors that arise in the modeling of arbitrary (e.g., curved, slanted) interfaces by regular orthogonal grids. In particular, locally-conformal algorithms based on the computation of effective material parameters in partially-filled FDTD cells are attractive because they are simple to implement and maintain the basic conditional stability of FDTD, with only minor changes on the Courant limit. In this paper, we propose a new locally-conformal implementation for FDTD tailored for anisotropic conductive interfaces. Instead of employing arithmetic or geometrical averages, we invoke the quasi-static relationship between the current density and the electric field to derive the effective conductivities of partially-filled FDTD cells.

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“…In the latter case, the effect of the singular behavior of the fields near the edge is accounted for by using an appropriately modified value of permittivity and permeability for the material surrounding the edge. The use of MAMPs has been shown to be simple and effective for a variety of situations including patch antennas [4], lossy coaxial structures [5], wires [6], [7] and microstrip transmission lines [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Structures Containing Sharp Oblique Metal Edges in FDTD Using MAMPs

Railton

Paul

2010

IEEE Trans. Antennas Propagat.

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Abstract-Previous enhancements to the finite difference time domain method have facilitated the analysis of structures such as those containing sharp metal edges which are aligned with the mesh or of smoothly curved metal objects. So far, however, there has been little work on the often encountered situation of thin metal edges which are inclined at an angle to the mesh other than for the special case of diagonal orientation. In this paper, the general case is examined and it is shown that the concept of modified assigned material parameters (MAMPs) can be extended to provide an effective and accurate means of treating this problem. Results are presented for curved microstrip patches, arbitrarily inclined rectangular microstrip patches and for the more complex case of a coplanar fed bow tie slot antenna.Index Terms-Edges, finite difference time domain (FDTD), modified assigned material parameters (MAMPs), singularities.

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An Improved Thin Wire Representation for FDTD Computations

Cited by 65 publications

References 10 publications

Validation of a non-uniform meshing algorithm for the 3D-FDTD method by means of a two-wire crosstalk experimental set-up

Validation of a non-uniform meshing algorithm for the 3D-FDTD method by means of a two-wire crosstalk experimental set-up

Locally-Conformal FDTD for Anisotropic Conductive Interfaces

Analysis of Structures Containing Sharp Oblique Metal Edges in FDTD Using MAMPs

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