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FREQUENCY-CHARACTERISTICS OF THE RADIATION BOUNDARY-CONDITION IN finite-difference time-domain method AND ITS IMPROVEMENT

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IEICE TRANSACTIONS ON COMMUNICATIONS 1994年第1期E77B卷 81-85页

作者： KODAMA, M KUNINAKA, M Univ of the Ryukyus Okinawa-ken Japan

When we use the finite-difference time-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 finite difference 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.

关键词： finite-difference time-domain method ONE-WAY WAVE EQUATION RADIATION BOUNDARY CONDITION

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ANALYSIS OF MICROSTRIP CROSSOVERS USING THE NONORTHOGONAL finite-difference time-domain method

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1994年第1期77卷 26-34页

作者： KITAMURA, T NAKAMURA, S HIRA, M KURAZONO, S OSAKA UNIV FAC ENGNDEPT COMMUN ENGNSUITAOSAKA 565JAPAN

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-difference time-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.

关键词： ARBITRARY COORDINATE SYSTEM finite-difference time-domain method CROSSOVER CROSSTALK ANALYSIS MULTILAYERED MMIC

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ANALYSIS OF SUPERCONDUCTIVE INTERCONNECTS BY THE finite-difference time-domain method

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1994年第18期7卷 837-840页

作者： WANG, BZ Institute of Applied Physics University of Electronic Science and Technology of China Chengdu 610054 People's Republic of China

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.

关键词： ULTRAHIGH-SPEED DIGITAL INTEGRATED CIRCUIT SUPERCONDUCTIVITY INTERCONNECT finite-difference time-domain method

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Analysis of surface-wave excitation and radiation mechanisms of a monopole on a circular grounded dielectric slab with critical thickness

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IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION 1996年第4期143卷 335-340页

作者： Maci, S Raffaelli, S Leoncini, M Borselli, L Kildal, PS CHALMERS UNIV TECHNOL DEPT MICROWAVE TECHNOLS-41296 GOTHENBURGSWEDEN

The properties of a monopole antenna on a circular, dielectric-loaded ground plane are analysed by using the finite-difference time-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.

关键词： surface-wave excitation monopole antennas finite-difference time-domain method artificial surfaces

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A quasi-static modification of TLM at knife edge and 90 degrees wedge singularities

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1996年第12期44卷 2519-2524页

作者： Cascio, L Tardioli, G Rozzi, T Hoefer, WJR UNIV ANCONA DIPARTIMENTO ELETTRON & AUTOMATI-60131 ANCONAITALY

A common drawback of numerical techniques such as transmission line method (TLM) and finite-difference time-domain method (FDTD) resides in the difficulty to accurately describe the electromagnetic field in structures with singularities, In this paper a local modification of the two-dimensional (2-D) TLM algorithm for the nodes surrounding a knife edge and a 90 degrees wedge is proposed, A quasi-static approximation of the field is used to derive an equivalent circuit of the edge, The proposed theory is then extended to the characterization of infinitely thin septa, the vertex of which is located anywhere between the nodes of the TLM mesh, The proposed corner correction is compared with the uncorrected TLM results and with data available in the literature, revealing a marked enhancement in the accuracy and convergence of the results.

关键词： Convergence corner correction Electromagnetic analysis electromagnetic field electromagnetic fields equivalent circuit Equivalent circuits finite difference methods finite difference time-domain analysis finite-difference time-domain method Frequency domain analysis infinitely thin septa knife edge local modification quasi-static approximation quasi-static modification time domain analysis TLM transmission line matrix methods Transmission line theory Two dimensional displays uncorrected TLM results waveguide discontinuities wedge singularities

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Numerical modeling of microwave heating systems

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JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY 1996年第2期31卷 114-121页

作者： Harms, PH Chen, Y Mittra, R Shimony, Y UNIV ILLINOIS DEPT ELECT & COMP ENGNURBANAIL 61801

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 finite difference time domain method 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.

关键词： microwave heating resonant cavity applicator waveguide applicator radio frequency parallel plate applicator computational electromagnetics finite-difference time-domain method

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Efficient FDTD/matrix-pencil method for the full-wave scattering parameter analysis of waveguiding structures

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1996年第12期44卷 2450-2456页

作者： Ritter, J Arndt, F Microwave Dept. Bremen Univ. Germany

A combined finite-difference time-domain/matrix-pencil method is presented for the efficient and rigorous calculation of the full-wave modal S-parameters of waveguide components including structures of more general shape or high complexity, The application of the S-parameter definition for unmatched ports requires merely standard Mur's absorbing boundaries for reliable results, and a nonorthogonal or contour path mesh formulation allows the convenient inclusion of curved boundaries, The efficiency of the method is demonstrated at the analysis of waveguide and monolithic microwave millimeter wave integrated circuit (MMIC) components of practical importance, such as the twisted waveguide, the twisted waveguide bend, the post compensated magic T, the waffle-iron filter, and the MMIC spiral inductor including an air bridge, The method is verified by excellent agreement with measurements, with finite element method (FEM) or moment method results.

关键词： air bridge contour path mesh formulation curved boundaries FDTD/matrix-pencil method finite difference methods finite difference time-domain analysis finite-difference time-domain method full-wave modal S-parameters full-wave scattering parameter analysis Integrated circuit reliability matrix algebra Microwave theory and techniques Millimeter wave measurements MIMIC MIMIC components MMIC MMIC components MMIC spiral inductor MMICs monolithic microwave integrated circuit monolithic millimeter wave integrated circuit Mur absorbing boundaries nonorthogonal mesh formulation post compensated magic T S-parameters Scattering parameters Shape time domain analysis Transmission line matrix methods twisted waveguide bend waffle-iron filter Waveguide components waveguide theory waveguiding structures

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A numerical and experimental investigation of the microwave heating of polymer materials inside a ridge waveguide

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JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY 1996年第2期31卷 71-82页

作者： Liu, F Turner, I Siores, E Groombridge, P School of Mathematics Queensland University of Technology Brisbane QLD 4001 Australia Sch. of Mech. and Mfg. Engineering Queensland University of Technology Brisbane QLD 4001 Australia

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-difference time-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.

关键词： ridge waveguide microwave heating polymer materials finite-difference time-domain method

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HIGHER-ORDER FORMULATION OF ABSORBING BOUNDARY-CONDITIONS FOR finite-difference time-domain method

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ELECTRONICS LETTERS 1993年第23期29卷 2018-2020页

作者： WANG, PY KOZAKI, S OHKI, M YABE, T Dept. of Electron. Eng. Gunma Univ. Japan

A simple formulation of absorbing boundary conditions with higher order approximation is proposed for the finite-difference time-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.

关键词： finite-difference time-domain method ELECTROMAGNETIC WAVES

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ON PRECISION OF SOLUTIONS BY finite-difference time-domain method OF DIFFERENT MESH SPACINGS

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IEICE TRANSACTIONS ON COMMUNICATIONS 1993年第3期E76B卷 315-317页

作者： KODAMA, M KUNINAKA, M Univ of the Ryukyus Okinawa-ken Japan

When we study time-domain electromagnetic fields, we frequently use the finite-difference time-domain (FD-TD) method. In this paper, we discuss errors of the FD-TD method and present the optimum mesh spacings in the F... 详细信息

关键词： PRECISION finite-difference time-domain method ELECTROMAGNETIC FIELD OPTIMUM MESH SPACING

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