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4th International Conference on Millimeter and Submillimeter Waves and Applications

作者： Ren, JS Wang, XD Hwu, RJ Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

ISBN: (纸本)0819429201

A method for the FDTD analysis of quasi-optical MESFET arrays is presented in this paper. To analyze active devices such as MESFETs, this method creates a set of field-state central finite difference equations;and all the field and state variables are solved simultaneously at the same FDTD time step. It will be shown in this paper that this formulation is simple and straightforward. The analysis of quasi-optical MESFET oscillator arrays have been performed to show the application of this method. Excellent agreements have been obtained between the results from this simulation method, from commercial softwares, and from experimental measurements to show the validity of this method.

关键词： finite-difference time-domain method Field effect transistors Oscillators Mirrors Circuit switching Dielectrics Inductance Magnetism Astatine Extremely high frequency

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FDTD analysis of optical forces on a nanometric object in the near zone of a metal slit 5

FDTD analysis of optical forces on a nanometric object in th...

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5th Congress on Modern Optics

作者： Chang, S Choi, WH Jo, JH Chung, ST Hannam Univ Dept Phys Taejon South Korea

A finite-difference time-domain (FDTD) method is used to examine the optical force acting on a nanometric object in the near zone of a metal slit Numerical results show that the object of refractive index N=1.5 can be... 详细信息

ISBN: (纸本)0819430382

关键词： finite-difference time-domain method Metals Refractive index Electromagnetic radiation Electromagnetism Particles Magnetism Optical tweezers Scattering Physics

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Three dimensional nonlinear optical fiber simulation

Three dimensional nonlinear optical fiber simulation

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4th International Conference on Millimeter and Submillimeter Waves and Applications

作者： Sullivan, DM Kuzyk, M Univ Idaho Dept Elect Engn Moscow ID 83844 USA

ISBN: (纸本)0819429201

In the development of nonlinear optical switching mechanisms, it would be very desirable to have a computer simulation of the electromagnetic pulse propagating in the nonlinear fiber. This would be helpful in understanding the underlying electromagnetics, and would also be helpful in designing new switching configurations, One method which has been widely used in electromagnetic simulation is the finite-difference time-domain (FDTD) method. Its effectiveness in optical fiber simulation is restricted by the fact that the short wavelengths of light dictate dense sampling, which becomes a logistical problem in three dimensional simulation. Techniques are described which allow 3D simulation of small sections of nonlinear optical fibers. The results of these simulations are used to predict behavior over longer distances.

关键词： finite-difference time-domain method Optical simulations Optical fibers Switching Computer simulations Phase shifts Radio propagation Wave propagation Electromagnetism Nonlinear optics

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Theoretical analysis of photoconducting microdipole antennas

Theoretical analysis of photoconducting microdipole antennas

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4th International Conference on Millimeter and Submillimeter Waves and Applications

作者： Reineix, A Ariaudo, M Besse, O Jecko, B Breuil, N Barthélémy, A IRCOM UMR CNRS 6615 Equipe Electromagnet Fac Sci F-87060 Limoges France

ISBN: (纸本)0819429201

Nowaday, it becomes necessary to characterize materials on a very large bandwidth for frequencies up to 100 GHz. Photoconducting microdipole antenna benches have already shown their ability to answer such a problem. Before the realization of such benches, a theoretical design of the antennas is necessary for the prediction of their behaviour (transient radiated free field duration, frequency bandwidth.,,). For this reason, we propose in this paper, a theoretical approach based on the coupling of different tools : the finite difference time domain method (FDTD), a drift diffusion model for considering photoconducting materials and the geometrical optic for the lens modeling. After the description of the software, some results will give the capabilities of such an approach.

关键词： Antennas finite-difference time-domain method Dielectrics Electrodes Electromagnetism Diffusion Photoresistors Terahertz radiation Interfaces Maxwell's equations

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Nonlinear FDTD analysis of Back-to-back varactor diode frequency tripler

Nonlinear FDTD analysis of Back-to-back varactor diode frequ...

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4th International Conference on Millimeter and Submillimeter Waves and Applications

作者： Ren, JS Wang, XD Hwu, RJ Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

ISBN: (纸本)0819429201

A quasi-optical diode-grid frequency tripler array was analyzed by the finite-difference time-domain (FDTD) method in this paper. A nonlinear algorithm was successfully developed in order to deal with the nonlinear characteristic of a varactor. The results obtained for a test case showed excellent agreement between the FDTD and a direct mathematical method. The detailed analysis of a frequency tripler array employing back-to-back AlGaAs/GaAs heterojunction varactor was given.

关键词： finite-difference time-domain method Algorithm development Mirrors Diodes Heterojunctions Extremely high frequency Virtual colonoscopy Astatine Magnetism Electrical engineering

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An efficient artificial absorbing layer for the wave-equation FDTD method

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1998年第4期17卷 243-244页

作者： Ma, JG Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

An efficient artificial absorbing layer (AAL) is presented for the wave-equation FDTD method. Numerical experiments show that the new absorbing boundary can absorb outgoing and reflected waves successfully. (C) 1998 J... 详细信息

关键词： numerical methods finite-difference time-domain method absorbing boundary

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Technique combining the finite-difference time domain and the uniform theory of diffraction

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Microwave and Optical Technology Letters 1998年第1期16卷

作者： B. Beillard J. Andrieu Y. Chevalier B. Jecko I.R.C.O.M. Equipe “Electromagnétisme” I.U.T. G.E.I.I. BRIVE-7 19100 Brive France

This letter describes a method intended for the resolution of the electromagnetic diffraction of structures of very different sizes. The problem to be solved is divided into two subdomains: the first where a “rigorous” method analyzes the radiation of small elements, and the second where an “asymptotic” method analyzes the diffraction on the edges of large elements. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 21–23, 1997.

关键词： finite-difference time-domain method uniform theory of diffraction electromagnetic wave diffraction

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A SEMIGLOBAL RADIATION BOUNDARY-CONDITION FOR THE finite-difference time-domain method

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1995年第2期8卷 77-84页

作者： DEMOERLOOSE, J DEZUTTER, D Department of Information Technology (Laboratory of Electromagnetism and Acoustics) University of Gent Sint-Pietersnieuwstraat 41 9000 Gent Belgium

In the analysis of antennas and scattering problems by the finite-difference-time-domain (FDTD) method, the dimensions of the problem space are primarily determined by the quality of the radiation boundary condition (RBC) that is used to truncate the computational grid. The performance of the recently proposed higher-order boundary conditions in cases of practical importance is often worse than the standard Mur-second-order condition. In the present article we will show that the reason for this unexpected result is the inability of this type of one-way wave equation to deal with the evanescent or inhomogeneous plane-wave part of the field. On the basis of this consideration we have constructed a new semiglobal operator that does have the required property. By combining this operator with the unusual Mur-second-order condition one arrives at an RBC with a much better performance. The novel RBC can also be used to analyze static problems. (C) 1995 John Wiley & Sons, Inc.

关键词： RADIATION SCATTERING finite-difference time-domain method NUMERICAL methodS

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A performance assessment of Liao's absorbing boundary conditions for FD–TD method

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Microwave and Optical Technology Letters 1998年第3期16卷

作者： T. S. Yeo P. S. Kooi M. S. Leong R. H. Feng Communications and Microwave Division Department of Electrical Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260

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 α in Liao's ABC for various incident angles is also given herein. Proper choice of α enables one to use an ABC of lower order, thus resulting in a savings in computational requirements. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 186–197, 1997.

关键词： finite-difference time-domain method absorbing boundary condition

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A new method ofS-parameter extraction from the FDTD in analyses of microstrip circuit discontinuities

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Microwave and Optical Technology Letters 1998年第3期16卷

作者： Zhiyuan Yu Institute of Applied Physics University of Electronic Science and Technology of China Chengdu 610054 P.R. China

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. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 162–163, 1997.

关键词： microstrip discontinuities finite-difference time-domain method numerical method

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