A hybrid technique combining the method of moments in the time domain and FDTD

Bretones, A.R.; Mittra, R.; Martin, R.G.

doi:10.1109/75.704414

Cited by 53 publications

(28 citation statements)

References 6 publications

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“…As GA calls repeatedly for the electromagnetic solver, it is critical to use the faster code, and therefore NEC was used during the GA-optimization process. However, DOTIG is used to validate the final design and, as NEC is not able to compute subsurface fields, a combination of DOTIG with finite-distance time-domain [20] is applied when is necessary to calculate those fields. Future optimized designs in the presence of soil will be proposed and studied applying NEC, which allows the analysis of antennas located close to a lossy half space.…”

Section: Ga Antenna Designmentioning

confidence: 99%

“…A specific antenna is defined by: the number of wires (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20); the angular distances between wires; and the number and values of the resistive loads along the wires (ranging from 0-450 ). The different parameters corresponding to a specific antenna are encoded into a chromosome composed of 20 integer digits using fixed-point coding (each integer digit varying from 0-9) and each chromosome consists of six genes.…”

Section: Ga Antenna Designmentioning

confidence: 99%

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GA design of a thin-wire bow-tie antenna for GPR applications

Coevorden

Bretones

Pantoja

et al. 2006

IEEE Trans. Geosci. Remote Sensing

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Abstract-A microgenetic algorithm has been applied to design a new ultrawideband thin-wire bow-tie antenna for ground-penetrating radar applications. The broadband performance of the antenna is achieved by resistive loading and by optimizing the number of wires and the angular distances between those wires. The radiation characteristics of the optimized antenna are discussed, and its performance is compared to that of a restively loaded Wu-King dipole.

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Section: Ga Antenna Designmentioning

confidence: 99%

Section: Ga Antenna Designmentioning

confidence: 99%

GA design of a thin-wire bow-tie antenna for GPR applications

Coevorden

Bretones

Pantoja

et al. 2006

IEEE Trans. Geosci. Remote Sensing

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“…The TDIE/FDTD method and the FDTD/FETD/TDIE method have been proposed for complex electromagnetic problems [9,10]. Discontinuous Galerkin Time-Domain (DGTD) method [11][12][13][14][15] inherits from Finite Element Time-Domain (FETD) the advantage of unstructured grids without solving large linear systems.…”

Section: The Hybrid Methodsmentioning

confidence: 99%

Time-Domain Analytical Expression for Near Fields of Arbitrarily Oriented Electric Dipole and Its Application

Yang

Wei

et al. 2017

International Journal of Antennas and Propagation

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The near fields of electric dipole are commonly used in wide-band analysis of complex electromagnetic problems. In this paper, we propose new near field time-domain expressions for electric dipole. The analytical expressions for the frequency-domain of arbitrarily oriented electric dipole are given at first; next we give the time-domain expressions by time-frequency transformation. The proposed expressions are used in hybrid TDIE/DGTD method for analysis of circular antenna with radome. The accuracy of the proposed algorithm is verified by numerical examples.

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“…More recently, Bretones et al presented [7] a time-domain version of MoM in a hybrid approach for studying the transient excitation of a thin wire antenna located in the proximity of an inhomogeneous dielectric scatterer and above a perfectly electrically conducting ground plane. Also, Cerri et al [8] used a time-domain version of MoM for a hybrid technique [8].…”

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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A hybrid technique combining the method of moments in the time domain and FDTD

Cited by 53 publications

References 6 publications

GA design of a thin-wire bow-tie antenna for GPR applications

GA design of a thin-wire bow-tie antenna for GPR applications

Time-Domain Analytical Expression for Near Fields of Arbitrarily Oriented Electric Dipole and Its Application

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

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