The use of variational principles with the FDTD scheme is introduced by simulating simple dipole antenna structures. Input impedances of the antennas are computed with the variational method and with direct definition...
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The use of variational principles with the FDTD scheme is introduced by simulating simple dipole antenna structures. Input impedances of the antennas are computed with the variational method and with direct definition V-in/I-in. The variational method clearly shows a better agreement with the reference results than the commonly used voltage-current ratio-based derivation. (C) 1998 John Wiley & Sons, Inc.
In this letter, a new implementation of the three-dimensional (3-D) perfectly matched layer (PML) in finite-differencetime-domain (FDTD) applications is introduced. This technique is based on doubling the cell dimens...
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In this letter, a new implementation of the three-dimensional (3-D) perfectly matched layer (PML) in finite-differencetime-domain (FDTD) applications is introduced. This technique is based on doubling the cell dimensions in PML region where extra averaging of electrical field components are necessary at the edges and faces along the PML-FDTD interfaces. The presented numerical examples are for 3-D structures which exhibit complex wave phenomena. Significant improvement obtained after this implementation, especially at lower frequencies, is demonstrated.
The influence of loaded capacitance on the resonant frequency of a triplate-type strip resonator is investigated through numerical simulations by means of the finite-differencetime-domain (FDTD) method. This type of ...
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The influence of loaded capacitance on the resonant frequency of a triplate-type strip resonator is investigated through numerical simulations by means of the finite-differencetime-domain (FDTD) method. This type of resonator is one of the basic components of very small high-dielectric stripline filters, named laminated planar filters. Numerical results of resonant frequencies are compared with experimental results and found to be in excellent agreement, which circumstance ensures that the FD TD method can be applied to the characterization of a wide range of laminated planar microwave devices including resonators and filters. It is also found that the resonant frequency is directly related to the square root of its line capacitance when the resonator is regarded equivalently as a series LC circuit.
We present a finite-differencetime-domain (FD-TD) method with the perfectly matched layers (PMLs) absorbing boundary condition (ABC) based on the multidimensional wave digital filters (MD-WDFs) for discrete-time mode...
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We present a finite-differencetime-domain (FD-TD) method with the perfectly matched layers (PMLs) absorbing boundary condition (ABC) based on the multidimensional wave digital filters (MD-WDFs) for discrete-time modelling of Maxwell's equations and show its effectiveness. First we propose modified forms of the Maxwell's equations in the PMLs and its MD-WDFs' representation by using the current-controlled voltage sources. In order to estimate the lower bound of numerical errors which come from the discretization of the Maxwell's equations, we examine the numerical dispersion relation and show the advantage of the FD-TD method based on the MD-WDFs over the Yee algorithm. Simultaneously, we estimate numerical errors in practical problems as a function of grid cell size and show that the MD-WDFs can obtain highly accurate numerical solutions in comparison with the Yee algorithm. Then we ana lyze several typical dielectric optical waveguide problems such as the tapered waveguide and the grating filter, and confirm that the FD-TD method based on the MD-WDFs can also treat radiation and reflection phenomena, which commonly done using the Yee algorithm.
A new method for computing the mutual coupling between aperture antennas using the finite-differencetime-domain (FDTD) method together with the Kirchhoff near-field to near-field transformation is described. The meth...
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A new method for computing the mutual coupling between aperture antennas using the finite-differencetime-domain (FDTD) method together with the Kirchhoff near-field to near-field transformation is described. The method offers a reduction in computer storage, particularly for widely spaced antenna elements in an array.
In a recent letter, a new implementation of the complementary operators method (COM) was introduced for 2-D radiation problems. Referred to as the concurrent complementary operators method (C-COM), this new implementa...
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In a recent letter, a new implementation of the complementary operators method (COM) was introduced for 2-D radiation problems. Referred to as the concurrent complementary operators method (C-COM), this new implementation achieved a level of accuracy and efficiency that surpassed that achieved earlier by the classical two-solution implementation of COM. This letter extends the application of the C-COM to treat 3-D radiation problems. Numerical results using the finite-difference time-domain method (FDTD) for two representative experiments are presented to demonstrate the effectiveness of this new technique. (C) 1998 John Wiley & Sons, Inc.
This paper is a presentation of the coupling between the finite-difference time-domain method and a circuit simulator tool. This approach enables us to model the interactions between antennas and nonlinear integrated ...
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This paper is a presentation of the coupling between the finite-difference time-domain method and a circuit simulator tool. This approach enables us to model the interactions between antennas and nonlinear integrated circuits. The behavior of a "Mickey" antenna struck by a high-frequency impulsion and protected by a gas arrester will be shown. (C) 1998 John Wiley & Sons, Inc.
A perfectly matched layer (PML) is terminated with lossy absorbing boundary conditions (ABCs) and used for truncating the FDTD computational domain. By terminating the PML,with a lossy ABC rather than a perfect electr...
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A perfectly matched layer (PML) is terminated with lossy absorbing boundary conditions (ABCs) and used for truncating the FDTD computational domain. By terminating the PML,with a lossy ABC rather than a perfect electric conductor (PEC) a considerable reduction in the reflection errors is achieved at the expense of a very small increase in the computational time. (C) 1998 John Wiley & Sons, Inc.
The realisation of a magnetic conducting surface using a novel two-dimensional uniplanar photonic bandgap structure is described. This novel idea is verified by measured results and the results obtained using the fini...
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The realisation of a magnetic conducting surface using a novel two-dimensional uniplanar photonic bandgap structure is described. This novel idea is verified by measured results and the results obtained using the finite-difference time-domain method.
A comparison between two forward solving methods, recursive T-matrix and FDTD, is presented. The strengths and weaknesses of both methods are discussed. The recursive T-matrix method is a fast solver that is well suit...
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ISBN:
(纸本)0819428418
A comparison between two forward solving methods, recursive T-matrix and FDTD, is presented. The strengths and weaknesses of both methods are discussed. The recursive T-matrix method is a fast solver that is well suited to solutions in homogeneous media where the scatterers are bodies of rotation. The FDTD method is best suited to complicated and realistic problems involving inhomogeneities, rough surface interfaces and irregular shaped scatterers. Numeric results from both methods are presented.
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