A hybrid finite-difference-time-domain/angular spectrum propagation modeling technique and a finite-difference thermal model are used to study near-field optical and two-photon absorption data storage systems. The ele...
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ISBN:
(纸本)0819425303
A hybrid finite-difference-time-domain/angular spectrum propagation modeling technique and a finite-difference thermal model are used to study near-field optical and two-photon absorption data storage systems. The electromagnetic model is used to analyze scattering effects in structures where scalar-based theory is not appropriate. The thermal model is used in a near-field magneto optic data storage system to calculate data mark sizes.
A new method of S-parameter extraction from the FDTD in analyses of microstrip circuits is proposed It only uses the Ex-field component parts in three selected transverse cross sections of the transmission line under ...
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A new method of S-parameter extraction from the FDTD in analyses of microstrip circuits is proposed It only uses the Ex-field component parts in three selected transverse cross sections of the transmission line under approach. The reflection coefficient is extracted from a single run of the FDTD. Neither prior knowledge of the line nor any computation of the derivative of the electric and magnetic fields is needed. The proposed new method is directly applicable to analyses of the discontinuities of microwave transmission circuits. (C) 1997 John Wiley & Sons, Inc.
The absorbing performance and computational efficiency of an accurate and efficient absorbing boundary condition due to Liao are discussed and compared with Mur's ABC. Numerical simulations show that Liao's AB...
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The absorbing performance and computational efficiency of an accurate and efficient absorbing boundary condition due to Liao are discussed and compared with Mur's ABC. Numerical simulations show that Liao's ABC in general outperforms Mur's ABC. Furthermore, Liao's ABC provides greater flexibility and accuracy than Mur's ABC for arbitrary incidence. Based on the results of these computer simulations the relative performance, including their efficiencies, CPU, and memory requirements, are tabulated for easy reference. A selection guide for the weighting factor alpha in Liao's ABC for various incident angles is also given herein. Proper choice of alpha enables one to use ail ABC of lower order, this resulting in a savings in computational requirements. (C) 1997 John Wiley & Sons, Inc.
When we use the finite-differencetime-domain (FD-TD) method to study time-domain electromagnetic fields in the unbounded surroundings, we frequently use a radiation boundary condition (RBC) by means of one-way wave e...
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When we use the finite-differencetime-domain (FD-TD) method to study time-domain electromagnetic fields in the unbounded surroundings, we frequently use a radiation boundary condition (RBC) by means of one-way wave equations. The reflection coefficient by the RBC is independent of frequency, but the reflection coefficient of the finitedifference approximation for the RBC depends on a frequency also;this study examines how the reflection characteristics are affected by the frequency, and the study presents the coefficients used in the RBC which gives expected reflection characteristics for a frequency, and presents the application to simulation of the matched termination of a rectangular waveguide.
Multilayered monolithic microwave integrated circuits (MMIC) have been proposed with a view to reducing the size and increasing the degree of integration of the MMIC. It has been demonstrated that new circuit configur...
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Multilayered monolithic microwave integrated circuits (MMIC) have been proposed with a view to reducing the size and increasing the degree of integration of the MMIC. It has been demonstrated that new circuit configurations can be realized and the design capability can be improved. By the use of a multilayered MMIC, the circuit can be laminated so that the circuit size can be made smaller. However, since the circuit is laminated, qualitative evaluation of the crosstalks between the upper and lower transmission lines becomes important. Most of the previous analyses on the microstrip line crossover focused on the case where the two lines cross orthogonally. In this research, the finite-differencetime-domain (FD-TD) method applicable to an arbitrary coordinate system is used for the analysis of the crosstalk when two transmission lines cross at an arbitrary angle. First, the FD-TD method that can be applied to an arbitrary coordinate system is summarized. Next, it is confirmed that the results of the present analysis for a single microstrip line do not depend on the mesh shape and that the present analysis results agree with those by other methods for a microstrip bend with an arbitrary angle. Finally, a three-dimensional crossover of microstrip lines with an arbitrary angle is analyzed. The normalized frequency characteristics, cross-angle dependence, and the interdistance dependence of the s parameters are presented.
A methodology is described for the analysis on superconductive interconnects. First, the time-domain impedance boundary condition (TDIBC) of a superconductor is obtained from its frequency-domain counterpart. Next, di...
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A methodology is described for the analysis on superconductive interconnects. First, the time-domain impedance boundary condition (TDIBC) of a superconductor is obtained from its frequency-domain counterpart. Next, discretization of the TDIBC is presented in the context of the finite-difference-time-domain (FDTD) technique. The FDTD solutions for a superconductive parallel-plate transmission line are in good agreement with the exact solutions. Finally, the transmission property of a superconductive via is analyzed by the FDTD method. (C) 1994 John Wiley & Sons, Inc.
The properties of a monopole antenna on a circular, dielectric-loaded ground plane are analysed by using the finite-differencetime-domain (FDTD) technique. The thickness of the dielectric slab has been chosen to maxi...
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The properties of a monopole antenna on a circular, dielectric-loaded ground plane are analysed by using the finite-differencetime-domain (FDTD) technique. The thickness of the dielectric slab has been chosen to maximise the decay of the space-wave contribution at grazing, thus reducing the space-wave diffraction at the truncation. This permits realisation of a low-side/back-lobe antenna provided that the spurious diffraction of the dominant TM surface wave is properly blocked. The radiation pattern of the antenna is similar to that of a monopole on an artificially soft (corrugated) disc. The accuracy of FDTD prediction is tested by comparisons with far-field measurements and a moment-method analysis.
Microwave heating plays a significant role in the processing of materials in industry, but the applicator design is generally done without numerical methods or simulations because of the difficulty of the design probl...
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Microwave heating plays a significant role in the processing of materials in industry, but the applicator design is generally done without numerical methods or simulations because of the difficulty of the design problem. Much research has shown that the finitedifferencetimedomainmethod can model complex geometries and analyze many types of electromagnetic problems. This paper will employ this approach to study three major types of microwave heating applicators and thereby demonstrate the capabilities of this technique to analyze a variety of microwave heating applicators.
Microwave joining of polymer materials using ridge waveguides is a relatively new area of research. In order to gain insight into the phenomena that occur inside the ridge waveguide, together with the temperature dist...
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Microwave joining of polymer materials using ridge waveguides is a relatively new area of research. In order to gain insight into the phenomena that occur inside the ridge waveguide, together with the temperature distribution in the polymer material, a detailed knowledge of the power distribution is necessary. In this paper, Maxwell's electromagnetic equations are coupled to the heat transfer equation and solved numerically in order to simulate the microwave heating of a polymer material inside a ridge waveguide. The electromagnetic fields and power distribution in the polymer material within the waveguide are predicted by means of the finite-differencetime-domain (FD-TD) technique. The FD-TD scheme is modified for the field component adjacent to the curved surface of the ridge waveguide by applying the contour path technique.
A simple formulation of absorbing boundary conditions with higher order approximation is proposed for the finite-differencetime-domain (FD-TD) method. Although this formulation is based on the third order approximati...
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A simple formulation of absorbing boundary conditions with higher order approximation is proposed for the finite-differencetime-domain (FD-TD) method. Although this formulation is based on the third order approximation of the one-way wave equations, the authors have succeeded in reducing it to an equation in a form quite similar to the second order approximation.
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