An accurate 2-D hard-source model for FDTD

Makinen, R.; Juntunen, J.; Kivikoski, M.

doi:10.1109/7260.914307

Cited by 9 publications

(10 citation statements)

References 4 publications

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“…In order to validate the thin wire-RVS model, we compare our results with reference data for a thin dipole antenna [17] and NEC-2 simulations data [16], and also with the measurements undertaken on our tomography system, which comprises an array of monopole antennas arranged in a circular grid.…”

Section: Numerical Results and Discussionmentioning

confidence: 98%

“…As a result, the errors in resonant frequency due to the grid coarseness dominate the errors caused by numerical dispersion. The possible solution is to implement the EC model, where the currents at the antenna ends are approximated by the uniform line charge distribution in the modified FDTD formulations [16], [17].…”

Section: A Half-wave Dipole As Transmitting and Receiving Antennamentioning

confidence: 99%

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Measured Antenna Response of a Proposed Microwave Tomography System Using an Efficient 3-D FDTD Model

Padhi

Fhager

Howard

2008

Antennas Wirel. Propag. Lett.

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This letter presents a detailed study of a microwave tomography system using 3-D finite-difference time-domain methods (FDTDs). The algorithm, which uses a subcell model in form of the thin-wire approximation to model wire antennas, has been validated numerically using published numerical electromagnetic code (NEC) data for dipole antennas, and experimentally by comparing with measurements obtained for a monopole antenna array. The agreement between calculated and measured performances of the monopoles is close. In order to understand the fabrication tolerance, a parametric study was performed with regards to position of ground plane and grid size. It is found that the ground plane plays an important role in the performance of the monopole antennas. The excellent agreement is very promising for future deployment of the algorithm in 3-D microwave tomography applications.Index Terms-Finite difference time domain method, resistive voltage source, microwave imaging, microwave measurements, transient analysis.

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Section: Numerical Results and Discussionmentioning

confidence: 98%

Section: A Half-wave Dipole As Transmitting and Receiving Antennamentioning

confidence: 99%

Measured Antenna Response of a Proposed Microwave Tomography System Using an Efficient 3-D FDTD Model

Padhi

Fhager

Howard

2008

Antennas Wirel. Propag. Lett.

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“…However, in FDTD each field component should represent an average value of that field along a Cartesian cell edge [1]. Therefore, the magnetic field components are projected from to Cartesian cell edges prior to using them in FDTD equations [2]- [4]. Similarly, the radial electric field components adjacent to the wire flowing through Cartesian cell facets are projected to cylindrical surfaces such as in Fig.…”

Section: A Update Equationsmentioning

confidence: 99%

A stabilized resistive voltage source for FDTD thin-wire models

Makinen

Kivikoski

2003

IEEE Trans. Antennas Propagat.

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The von Neumann analysis is applied to investigate the stability of a source connected on a wire described by a thin-wire model. Both a soft source and a resistive voltage source (RVS) are shown to limit the stable range of values for wire radius or time step. Using the von Neumann analysis, a stable RVS model for thin wires is developed. The proposed model is verified by comparison with a hard source, an original RVS and NEC-generated reference data. The stabilized RVS introduces no additional stability constraints on those of the wire model while maintaining fast decay of incident fields of the original RVS model. Index Terms-Finite-difference time-domain (FDTD) methods, stability.

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“…A resistive voltage source (RVS) is implemented in our algorithm and the resultant update equations for E z component can be expressed as follows [8][9][10]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%