Application of the nonuniform FDTD technique to analysis of coaxial discontinuity structures

Yu, Weikuan; Mittra, R.; Dey, Satadru

doi:10.1109/22.900011

Cited by 18 publications

(8 citation statements)

References 11 publications

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“…The most convenient way to built our conformal lattice in a general coordinate system, properly selected to guarantee cells of optimal quality without face skewing or deformations, is the use of a non-overlapping dual-grid discretization [28][29][30][31]. Actually, the precision of the proposed modeling algorithm relies on the systematic construction of the mesh in order to obtain the correct curves which enclose the object, under study, and the proper surfaces that surround its volume.…”

Section: Conformal Dual-mesh Curvilinear Modelingmentioning

confidence: 99%

Combined FVTD/PSTD Schemes with Enhanced Spectral Accuracy for the Design of Large-Scale EMC Applications

Kantartzis

Dimitriadis

Tsiboukis

2012

AEM

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A generalized conformal time-domain method with adjustable spectral accuracy is introduced in this paper for the consistent analysis of large-scale electromagnetic compatibility problems. The novel 3-D hybrid schemes blend a stenciloptimized finite-volume time-domain and a multimodal Fourier-Chebyshev pseudo-spectral time-domain algorithm that split the overall space into smaller and flexible areas. A key asset is that both techniques are updated independently and interconnected by robust boundary conditions. Also, combining a family of spatial derivative approximators with controllable precision in general curvilinear coordinates, the proposed method launches a conformal field flux formulation to derive electromagnetic quantities in regions with fine details. For advanced grid reliability at dissimilar media interfaces, dispersion-reduced adaptive operators, which assign the proper weights to each spatial increment, are developed. So, the resulting discretization yields highly rigorous and computationally affordable simulations, devoid of lattice errors. Numerical results, addressing detailed comparisons of various realistic applications with reference or measurement data verify our methodology and reveal its significant applicability.

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Section: Conformal Dual-mesh Curvilinear Modelingmentioning

confidence: 99%

Combined FVTD/PSTD Schemes with Enhanced Spectral Accuracy for the Design of Large-Scale EMC Applications

Kantartzis

Dimitriadis

Tsiboukis

2012

AEM

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“…where r i+1/2 is the distance between the center of cell (i) and the axis of the structure, and ε i+1/2 the complex permittivity at the interface between cell (i) and cell (i + 1), which can be calculated as below by employing spatial average [12][13][14][15][16].…”

Section: Solving Propagation Constants In Axisymmetrical Structuresmentioning

confidence: 99%

“…This kind of structures are usually analyzed in the frequency domain by using mode matching method [3,4,7,8], full-wave spectral-domain method [9], finite element method [5,10], or frequency domain transmission line matrix method [6], or in the time domain by using FDTD method [11][12][13][14]. Although the numerical methods such as finite element method and FDTD can deal with complex irregular structures with more flexibility, for the structures considered in this paper, it can be expected that the mode matching method has more advantages since it conforms closely to physical reality [7] and apparently has much less unknown variables.…”

Section: Introductionmentioning

confidence: 99%

Application of Mode Matching Method to Analysis of Axisymmetric Coaxial Discontinuity Structures Used in Permeability and/or Permittivity Measurement

Huang¹,

Zhang²

2007

PIER

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Abstract-This paper presents a mode matching method to analyze axisymmetric coaxial discontinuity structures, commonly used in the permeability and/or permittivity measurement. By performing the mode matching procedures at all discontinuity interfaces, a set of general simultaneous equations are derived, which can be easily solved. The s parameters and field distribution in the structures are readily obtained from the solution to the simultaneous equations. As a preliminary preparation for the mode matching method, the propagation constants of all the sections in the structure have to be solved. A one-dimensional frequency domain finite difference method is presented in this paper to efficiently solve the propagation constants for the multi-layered axisymmetric structures. Numerical examples show that the results obtained from the method in this paper are in good agreement with those from other methods in the published literature papers, and the method presented here has much higher efficiency.

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“…Most simple types of discontinuities such as steps in inner or outer conductors (see e.g., [1][2][3][4]) and wall impedance discontinuities [5][6][7] were analyzed and characterized. For example, in [5] and [6] the scattering of a shielded surface wave in a coaxial waveguide by a wall impedance discontinuity in the inner cylinder has been analyzed.…”

Section: Introductionmentioning

confidence: 99%

Wiener-Hopf Analysis of Finite-Length Impedance Loading in the Outer Conductor of a Coaxial Waveguide

Büyükaksoy¹

2008

PIER B

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Abstract-A new canonical scattering problem consisting of the propagation of the dominant TEM mode at the finite-length impedance discontinuity in the outer conductor of a coaxial waveguide is solved. The contributions from the successive impedance discontinuities are accounted for through the solution of a modified Wiener-Hopf equation. Some graphical results displaying the reflection and transmission characteristic are presented.

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Application of the nonuniform FDTD technique to analysis of coaxial discontinuity structures

Cited by 18 publications

References 11 publications

Combined FVTD/PSTD Schemes with Enhanced Spectral Accuracy for the Design of Large-Scale EMC Applications

Combined FVTD/PSTD Schemes with Enhanced Spectral Accuracy for the Design of Large-Scale EMC Applications

Application of Mode Matching Method to Analysis of Axisymmetric Coaxial Discontinuity Structures Used in Permeability and/or Permittivity Measurement

Wiener-Hopf Analysis of Finite-Length Impedance Loading in the Outer Conductor of a Coaxial Waveguide

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