On the Accurate Modeling of a Complex Antenna for Breast Tumor Detection Using a Hybrid MOM/FDTD Approach

Padhi, S.K.; F, Liu; Li, Bing Keong; Shuley, N.V.; Crozier, Stuart

doi:10.1109/iembs.2007.4353881

Cited by 8 publications

(14 citation statements)

References 14 publications

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“…The weight coefficients for dipole moments corresponding to the current on a section of the object with fine features are found over the desired frequency range using far field matching procedure 10 to obtain w( f ) and transformed to the timedomain to obtain w(t). In the time-domain, the scattered field expressions for a dipole moment oriented along u are given by (2) to (4).…”

Section: Arbitrarily Shaped Objects and Novel Dipole Moment Approachmentioning

confidence: 99%

“…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 [4][5][6][7][8] 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%

“…Several MoM/finite‐difference time‐domain (FDTD) hybrid techniques have been discussed in the literature in the past. The hybrid technique in Padhi et al and Li et al is based on Huygens' equivalent surface methods. 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.…”

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%

“…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. Arbitrarily shaped objects with fine features are handled by using the dipole moment-based MoM-type formulation, and electrically large objects are handled by the FDTD technique.…”

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: Arbitrarily Shaped Objects and Novel Dipole Moment Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Sharma

Mittra

2019

Int J Numerical Modelling

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Hybrid numerical techniques for the modelling of radiofrequency coils in MRI

Weber

et al. 2008

NMR in Biomedicine

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Radiofrequency (RF) coils for use in MRI can have a significant effect on both the signal-to-noise-ratio of MR images and the specific absorption rate inside the biological sample. In the past, prototypes were constructed and tested to investigate the performance of the RF coils and often required several iterations to achieve an acceptable result. However, with the advancement in computational electromagnetic techniques, RF coil modelling has now become the modus operandi of coil design because it can produce accurate numerical results, thus reducing the time and effort spent in designing and prototyping RF coils. Two hybrid methods -method of moments (MoM)/finite difference time domain (FDTD) and MoM/finite element method (FEM) - for RF coil modelling are presented herein. The paper provides a brief overview of FDTD, FEM and MoM. It discusses the hybridisation of these methods and how they are integrated to form versatile techniques. The numerical results obtained from these hybrid methods are compared with experimental results from prototype coils over a range of operating frequencies. The methods are then applied to the design of a new type of phased-array coil - the rotary phased array. From these comparisons, it can be seen that the numerical methods provide a useful aid for the design and optimisation of RF coils for use in MRI.

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Design of a Flexible Microstrip Antenna for BAN Applications

Sharma

Kumar

2022

J. Phys.: Conf. Ser.

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A flexible microstrip antenna is a compact antenna that can be coupled with the skin. However, such antennas require to be coupled with an intermediate matching liquid medium which makes the antenna bulky, complicated, and expensive. Body area network devices are wearable wireless devices/sensors that are used to get the information of a patient’s health in terms of physiological changes irrespective of location. A flexible layer made of Polyethylene is chosen as the substrate and a copper patch is levied upon it. This substrate layer lies in between two adhesive layers (GIL GML 1000).In this paper, flexible antennas are designed and simulated for Body area networks (BANs). The S11 parameter, VSWR value, Gain, and the radiation pattern of the antennas are compared. The polyethylene substrate is highly flexible and lightweight; therefore it would be an ideal material to be used as the substrate of the required antenna.

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On the Accurate Modeling of a Complex Antenna for Breast Tumor Detection Using a Hybrid MOM/FDTD Approach

Cited by 8 publications

References 14 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

Hybrid numerical techniques for the modelling of radiofrequency coils in MRI

Design of a Flexible Microstrip Antenna for BAN Applications

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