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International Workshop on Photonics and Imaging in Biology and Medicine

作者： Su, Q Mandel, S Menon, S Grobe, R Illinois State Univ Intense Laser Phys Theory Unit Normal IL 61790 USA

ISBN: (纸本)0819442607

We discuss how a spectral-domain method in combination with a split-operator technique can be used to calculate exact solutions of the time-dependent Maxwell's equations. We apply this technique to study the propagation of alight pulse through an inhomogeneous medium consisting of multiple random scatterers. We investigate the validity of the Boltzmann equation by directly comparing its solution with the ensemble averaged Maxwell solution.

关键词： Maxwell's equations Scattering Refraction Radio propagation Interfaces Diffusion Laser scattering finite-difference time-domain method Monte Carlo methods Wave propagation

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Coupling paths in multi-layer printed circuit boards for electromagnetic interference and immunity - Experiments and FDTD modeling

Coupling paths in multi-layer printed circuit boards for ele...

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Conference on Detection and Remediation Technologies for Mines and Minelike Targets VI

作者： Cui, W Berg, DP Drewniak, JL DuBroff, RE Univ Missouri Electromagnet Compatibil Lab Rolla MO 65409 USA

ISBN: (纸本)0819440892

Electromagnetic emissions from electronics associated with explosives is a potential detection modality, both passive listening, and stimulated RF emissions. However, the parasitic paths by which energy is coupled off a printed circuit board from an active device, and by which external energy can be coupled onto the board and to a device, must be identified and characterized. One such noise-coupling path is identified in this work, and a modeling approach demonstrated. In particular, coupling of noise from the DC power bus of a multilayer printed circuit board that uses entire metal layers for power and ground, and an I/O line that transitions through the DC power planes is investigated.

关键词： Clocks Electromagnetic coupling finite-difference time-domain method Electronics Resistors Dielectrics Electromagnetic interference Electromagnetism Explosives Metals

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Antenna system for UWB GPR for landmine detection

Antenna system for UWB GPR for landmine detection

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Conference on Detection and Remediation Technologies for Mines and Minelike Targets VI

作者： Yarovoy, A Schukin, A Kaploun, I Ligthart, L Delft Univ Technol Int Res Ctr Telecommun Transmiss & Radar NL-2628 CD Delft Netherlands

ISBN: (纸本)0819440892

The paper describes the design of an antenna system for a video impulse radar dedicated to landmine detection. The developed antenna system consists of a dielectric wedge antenna as transmit antenna and loop antennas as receive ones. The receive antennas are situated below the transmit one. The dielectric wedge antenna has been designed on the basis of the transmission line model, which has been later verified by means of FDTD modeling. The loop antenna has been designed on the basis of a semi-analytical model. The transient behaviour of the antenna system has been investigated both experimentally and theoretically. It is shown that the developed system illuminates a limited spot on the ground surface with a short electromagnetic pulse. The field scattered by objects is received by the antenna system in a local point and without integration over large antenna aperture. The output of each receive antenna reproduces the waveform of the scattered field in a local point. To avoid any mechanical contact with hazardous objects the antenna system should be elevated at least 10cm above the ground.

关键词： Antennas Dielectrics General packet radio service Land mines Radar Electromagnetism finite-difference time-domain method Ground penetrating radar Metals Near field

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Validation of the finite-difference time-domain method for near-field bioelectromagnetic simulations

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Microwave and Optical Technology Letters 1998年第6期16卷

作者： Cynthia M. Furse Quishan Yu Om P. Gandhi Department of Electrical Engineering University of Utah Salt Lake City Utah 84112

Validations of the accuracy of the FDTD method for near-field simulations are critical at this time to assess the accuracy of the FDTD method for the simulation of personal communication devices. Excellent comparisons between the FDTD method and analytical or measured results are shown for a dipole antenna next to a layered half-space, a layered box, and a sphere, and also an infinitesimal dipole near a sphere. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 341–345, 1997.

关键词： finite-difference time-domain method bioelectromagnetic simulations near-field simulations

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Comparison of scattering parameter calculations using touchstone and a full-wave electromagnetic solver based upon the finite-difference time-domain method

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Microwave and Optical Technology Letters 1998年第6期15卷

作者： S. Kosanovich R. Mittra Electromagnetic Communication Laboratory University of Illinois at Urbana–Champaign Urbana Illinois 61801

Scattering parameter results for various types of microstrip circuit configurations have been calculated using a full-wave electromagnetic solution technique. A full-wave electromagnetic solution technique is the most robust since it accounts for all coupling mechanisms present in a given geometry. The method is based upon the finite-difference time-domain (FDTD) method. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 15: 347–352, 1997.

关键词： microstrip circuits full-wave analysis electromagnetic solver finite-difference time-domain method microstrip discontinuities

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Characteristics of eccentric coaxial line using conformal mapping and finite-difference time-domain method

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Microwave and Optical Technology Letters 1998年第4期16卷

作者： Zhou Xiaojun Yu Zhiyuan Lin Weigan University of Electronic Science and Technology of China Chengdu 610054 P.R. China

This paper presents a general group of formulas by a combination of conformal mapping and 2-D FDTD (CF–FDTD). By this new method, the cutoff wavenumbers and dispersive characteristics of higher order TE modes in an eccentric coaxial line are given. A comparison of numerical results is presented. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 249–252, 1997.

关键词： finite-difference time-domain method coaxial line conformal mapping

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Analysis of photonic crystal filters by the finite-difference time-domain technique

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2000年第2期27卷 81-87页

作者： Wu, BI Yang, E Kong, JA Oswald, JA McIntosh, KA Mahoney, L Verghese, S MIT Elect Res Lab Cambridge MA 02139 USA Harvard Univ Dept Phys Cambridge MA 02138 USA MIT Lincoln Lab Lexington MA 02173 USA

A special finite-difference time-domain (FDTD) formulation oblique incidence for periodic media is used for the design and analysis of an infrared photonic crystal filter with dual stopbands at 3-5 and 8-12 mu m. The transmission coefficients in the main stopband (8-12 mu m) is below - 10 dB. Scattering coefficients are calculated for different incidence angles, and the stopbands are shown to exist for different angles of incidence. (C) 2000 John Wiley & Sons, Inc.

关键词： photonic crystal filters periodic structures finite-difference time-domain method

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Analysis and design of low loss and low mode-shift integrated optical waveguides using finite-difference time-domain method

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IEICE TRANSACTIONS ON ELECTRONICS 1997年第5期E80C卷 625-631页

作者： Doi, T Iwata, A Hirose, M Faculty of Engineering Hiroshima University Higashi-Hiroshima-shi 739 Japan

This paper describes the analysis of integrated optical waveguides using finite-difference time-domain (FDTD) method, and proposes the design methodology for low loss waveguide components: corner bends and branches. In order to integrate optical waveguides with Si VLSI technologies on a chip, the compact bends or branches are necessary. Since the optical power radiation from a bend or a branch point depends on the waveguide shapes, an accurate analysis of guided wave behavior is required. For the purpose we adopted the FDTD method which can analyze optical waveguides with a large variation of refractive index and arbitrary shape. Proposed design concept is to have all waveguides transmit only the fundamental mode and to design whole waveguides based on the fundamental mode transfer characteristics. For this design concept, waveguide components are required to have not only low radiation loss but also a little mode shift from the fundamental mode. The bend using the double-reflection mirrors and the branch using a slit are proposed for suppressing the mode shift and improving radiation loss. By the FDTD analysis, the following results have been obtained. The radiation loss and mode shift of double reflection bend are 1% and 4%, and those of the slit branch are 2% and 5%, respectively, in 2 mu m width waveguide.

关键词： integrated optical waveguide finite-difference time-domain method double-reflection waveguide slit branch waveguide

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Comparison of scattering parameter calculations using touchstone and a full-wave electromagnetic solver based upon the finite-difference time-domain method

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1997年第6期15卷 347-352页

作者： Kosanovich, S Mittra, R Electromagnetic Communication Laboratory University of Illinois at Urbana–Champaign Urbana Illinois 61801

关键词： microstrip circuits full-wave analysis electromagnetic solver finite-difference time-domain method microstrip discontinuities

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Validation of the finite-difference time-domain method for near-field bioelectromagnetic simulations

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1997年第6期16卷 341-345页

作者： Furse, CM Yu, QS Gandhi, OP Department of Electrical Engineering University of Utah Salt Lake City Utah 84112

关键词： finite-difference time-domain method bioelectromagnetic simulations near-field simulations

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