A finite-difference time-domain method incorporating perturbation techniques is used to calculate the Q factors of resonators with variable conductivities of conductor and dielectric. Several kinds of the resonators i...
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A finite-difference time-domain method incorporating perturbation techniques is used to calculate the Q factors of resonators with variable conductivities of conductor and dielectric. Several kinds of the resonators including empty cavities and a dielectric resonator are studied by this method. The numerical results are shown to be in excellent agreement with the rigorous theoretical solutions.
Slot narrow-wall couplers are simple but effective directional couplers. A simple and efficient approach to analyze these devices using the FDTD algorithm is presented. The technique uses a synthetic excitation and a ...
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Slot narrow-wall couplers are simple but effective directional couplers. A simple and efficient approach to analyze these devices using the FDTD algorithm is presented. The technique uses a synthetic excitation and a second-order ABC especially designed for the frequencies contained in the incident field. The method is illustrated in the computation of coupling and isolation of a two-slot - 20-dB coupler and is also applied to study a three-slot coupler. (C) 1994 John Wiley & Sons, Inc.
This Letter discusses the computation of scattering by thin lossy, nondispersive dielectrics using the finite-differencetime-domain (FD-TD) method. The time-domain relationship between the electric fields normal to a...
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This Letter discusses the computation of scattering by thin lossy, nondispersive dielectrics using the finite-differencetime-domain (FD-TD) method. The time-domain relationship between the electric fields normal to a lossy material boundary is used in a ''smart cell'' approach which allows the thickness of the dielectric to be less than the spatial grid size. These results are compared to the ''brute force'' FD-TD approach.
The radiation behavior of a microstrip traveling-wave antenna is theoretically analyzed using a time-domainmethod based on the FDTD. The time evolution of the fields and currents computed by the FDTD can be given in ...
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The radiation behavior of a microstrip traveling-wave antenna is theoretically analyzed using a time-domainmethod based on the FDTD. The time evolution of the fields and currents computed by the FDTD can be given in the frequency domain on a large bandwidth using Fourier transforms. Then it is possible to deduce classical parameters as the radiated field, the gain, and the power delivered by the antenna. (C) 1993 John Wiley & Sons, Inc.
In this article we apply the generalized eigenvalue method (GEM) to extract the complex exponentials from a truncated time record computed by the finite-differencetime-domain (FDTD) code for analyzing microwave integ...
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In this article we apply the generalized eigenvalue method (GEM) to extract the complex exponentials from a truncated time record computed by the finite-differencetime-domain (FDTD) code for analyzing microwave integrated circuits. To obtain accurate scattering parameters without further FD TD computations, the truncated FDTD time record is efficiently extended into the future by summing the complex exponentials with complex coefficients determined by the least-squares method. Numerical GEM results with fewer poles are shown to be in good agreement with those obtained by the Prony method with a large number of poles.
This paper discusses the fully three-dimensional finitedifferencetimedomain (FDTD) method to analyze a monopole antenna mounted on a rectangular conducting box covered with a layer of dielectric. The effects of the...
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This paper discusses the fully three-dimensional finitedifferencetimedomain (FDTD) method to analyze a monopole antenna mounted on a rectangular conducting box covered with a layer of dielectric. The effects of the conductivity and the permittivity of the dielectric layer are investigated. It is shown that all calculation results agree very well with the measured data.
In this article, the frequency-dependent finite-differencetime-domain (FD)2-TD technique is used to analyze a coaxial-line excited cylindrical cavity loaded with an electrically lossy dielectric, modeled by a first-o...
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In this article, the frequency-dependent finite-differencetime-domain (FD)2-TD technique is used to analyze a coaxial-line excited cylindrical cavity loaded with an electrically lossy dielectric, modeled by a first-order Debye expression. Results obtained for the reflected voltage in the coaxial line are Fourier transformed to yield the reflection coefficient GAMMA and input admittance at the coaxial aperture. Experimental measurements for GAMMA show good agreement with predicted (FD)2-TD results. (C) 1993 John Wiley & Sons, Inc.
A finite-differencetime-domain (FD-TD) method for analysing edge slots in rectangular waveguides is suggested. The proposal is supported by an example.
A finite-differencetime-domain (FD-TD) method for analysing edge slots in rectangular waveguides is suggested. The proposal is supported by an example.
This Letter discusses the computation of the scattering and radiation by thin wires with a nondispersive dielectric coating using the finite-difference time-domain method. A Fourier transform is then performed on the ...
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This Letter discusses the computation of the scattering and radiation by thin wires with a nondispersive dielectric coating using the finite-difference time-domain method. A Fourier transform is then performed on the time-domain results to obtain the scattering and antenna radiation patterns in the frequency domain.
The paper describes the application of the finite-differencemethod in the timedomain for obtaining the cutoff frequencies of TE and TM modes in waveguides of arbitrary cross-section. Maxwell's equations are disc...
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The paper describes the application of the finite-differencemethod in the timedomain for obtaining the cutoff frequencies of TE and TM modes in waveguides of arbitrary cross-section. Maxwell's equations are discretised in a two-dimensional space. The application of the discrete Fourier transform also provides the spatial distribution of the modes in the cross-section of the waveguide. The method is validated against rectangular and a circular waveguides, each with a known cutoff spectrum. Finally, the method is applied to determine cutoff wavelengths and modal field distributions in a square coaxial waveguide
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