An FDTD/MoM hybrid technique for modeling complex antennas in the presence of heterogeneous grounds

This paper proposes a hybrid full-wave analysis using Finite-Difference Time-Domain (FDTD) and Wave Concept Iterative Process (WCIP) methods, developed to analyze locally arbitrarily shaped microwave structures and Multilayer Planar structure. Using the equivalence principle, the original problem can be decomposed into two sub regions and solve each sub region separately. An interpolation scheme is proposed for communicating between the FDTD fields and WCIP wave, which will not require the effort of fitting the WCIP mesh to the FDTD cells in the interface region. This method is applied to calculate the scattering parameters of arbitrary (3-D) microwave structures. Applying FDTD to 3D discontinuity and WCIP to the remaining region preserves the advantages of both WCIP flexibility and FDTD efficiency. A comparison of the results with the FDTD staircasing data verifies the accuracy of the proposed method.

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“…The present method was applied to characterize the rectangular dielectric resonant antenna structure [15][16][17][18][19][20] shown in Figure 8.…”

Section: Numerical Resultsmentioning

confidence: 99%

Analysis of Complex Electromagnetic Structures by Hybrid FDTD/WCIP Method

Gharbi¹,

Zairi²,

Trabelsi³

et al. 2012

JEMAA

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“…The TD-MoM is fully hybridized with the FDTD, if the fields radiated by the thin-wire antennas are considered in the FDTD solution-procedure (at the location of the inhomogeneous bodies) and if the influence of the 110 A. Becker and V. Hansen: A hybrid method inhomogeneous bodies on the currents flowing on the thinwire antennas are considered in the TD-MoM solution procedure and vice versa. This is achieved by using the approach described in Huang et al (1999): The basic idea is to subdivide the FDTD-region into a scattered field region and into a total field region. By this a numeric Huygens source scheme is realised and it is possible to introduce arbitrary incident fields into the FDTD-volume.…”

Section: Td-mom+fdtd-hybrid Methodsmentioning

confidence: 99%

“…The points of contact for hybridization are the total-field/scattered-field formulation (see e.g. Huang et al, 1999) to introduce incoming fields into the FDTD-volume and the calculation of fields outside the FDTD-Volume with a surface integral representation of the electric field (see e.g. Skarlatos et al, 2005).…”

Section: Fdtdmentioning

confidence: 99%

A hybrid method combining the Time-Domain Method of Moments, the Time-Domain Uniform Theory of Diffraction and the FDTD

Becker

Hansen

2007

Adv. Radio Sci.

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Abstract. In this paper a hybrid method combining the Time-Domain Method of Moments (TD-MoM), the TimeDomain Uniform Theory of Diffraction (TD-UTD) and the Finite-Difference Time-Domain Method (FDTD) is presented. When applying this new hybrid method, thin-wire antennas are modeled with the TD-MoM, inhomogeneous bodies are modelled with the FDTD and large perfectly conducting plates are modelled with the TD-UTD. All inhomogeneous bodies are enclosed in a so-called FDTD-volume and the thin-wire antennas can be embedded into this volume or can lie outside. The latter avoids the simulation of white space between antennas and inhomogeneous bodies. If the antennas are positioned into the FDTD-volume, their discretization does not need to agree with the grid of the FDTD. By using the TD-UTD large perfectly conducting plates can be considered efficiently in the solution-procedure. Thus this hybrid method allows time-domain simulations of problems including very different classes of objects, applying the respective most appropriate numerical techniques to every object.

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“…This is aided by the greater maturity, flexibility and industrial acceptance of frequency-domain MoM 0018-9375/$20.00 © 2005 IEEE programs, due to the longer period over which they have been evolving. Huang et al [10] employed a hybrid technique for modeling the interaction of ground-penetrating radar (GPR) with complex ground using a combination of frequency domain MoM, Fourier transformation and iterations. This method has the same principles as the method proposed in the present work, while it focuses on GPR applications (the project started independently of, and approximately contemporaneously with, the present work [18].…”

Section: Introductionmentioning

confidence: 99%

Computation of Specific Absorption Rate in the Human Body due to Base-Station Antennas Using a Hybrid Formulation

Abd‐Alhameed

Excell

Mangoud

2005

IEEE Trans. Electromagn. Compat.

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Abd-Alhameed, R. A., Excell, P. S., & Mangoud, M. A. (2005)'Computation of specific absorption rate in the human body due to base-station antennas using a hybrid formulation'. IEEE Transactions on Electromagnetic Compatibility, 47(2), 374-381.Computation of specific absorption rate in the human body due to basestation antennas using a hybrid formulation AbstractA procedure for computational dosimetry to verify safety standards compliance of mobile communications base stations is presented. Compared with the traditional power density method, a procedure based on more rigorous physics was devised, requiring computation or measurement of the specific absorption rate (SAR) within the biological tissue of a person at an arbitrary distance. This uses a hybrid methd of moments/finite difference time domain(MoM/FDTD) numerical method in order to determine the field or SAR distribution in complex penetrable media, without the computational penalties that would result from a wholly FDTD simulation. It is shown that the transmitted power allowed by the more precise SAR method is, in many cases, between two and five times greater than that allowed by standards implementing the power flux density method. KeywordsHybrid method, specific absorption rate (SAR), safety standards, computational dosimetry Disciplines Computer Engineering | Computer SciencesComments ©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. This paper was published in IEEE Abstract-A procedure for computational dosimetry to verify safety standards compliance of mobile communications base stations is presented. Compared with the traditional power density method, a procedure based on more rigorous physics was devised, requiring computation or measurement of the specific absorption rate (SAR) within the biological tissue of a person at an arbitrary distance. This uses a hybrid methd of moments/finite difference time domain (MoM/FDTD) numerical method in order to determine the field or SAR distribution in complex penetrable media, without the computational penalties that would result from a wholly FDTD simulation. It is shown that the transmitted power allowed by the more precise SAR method is, in many cases, between two and five times greater than that allowed by standards implementing the power flux density method.Index Terms-Hybrid method, specific absorption rate (SAR).

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An FDTD/MoM hybrid technique for modeling complex antennas in the presence of heterogeneous grounds

Cited by 57 publications

References 8 publications

Analysis of Complex Electromagnetic Structures by Hybrid FDTD/WCIP Method

Analysis of Complex Electromagnetic Structures by Hybrid FDTD/WCIP Method

A hybrid method combining the Time-Domain Method of Moments, the Time-Domain Uniform Theory of Diffraction and the FDTD

Computation of Specific Absorption Rate in the Human Body due to Base-Station Antennas Using a Hybrid Formulation

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