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FREQUENCY-DEPENDENT finite-difference time-domain ANALYSIS OF HIGH-T-C SUPERCONDUCTING ASYMMETRIC COPLANAR STRIP LINE

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IEICE TRANSACTIONS ON ELECTRONICS 1995年第7期E78C卷 873-877页

作者： HIRA, M MIZOMOTO, Y KURAZONO, S Osaka Univ Suita-shi Japan

This paper describes analytical results of high-T-c superconducting asymmetric coplanar strip lines using the frequency-dependent finite-difference time-domain method. The propagation constants of the YBa2Cu3O7-x asymmetric coplanar strip line fabricated on the LiNbO3 substrate are reported. The effect of the SiO2 buffer layer is also investigated.

关键词： finite-difference time-domain method HIGH-T-C SUPERCONDUCTOR ASYMMETRIC COPLANAR STRIP LINE OPTICAL MODULATOR

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FULL-WAVE ANALYSES OF H-MESHED-STRIP LINE BY AN FDTD NETWORKING APPROACH

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INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES 1995年第8期16卷 1407-1414页

作者： WANG, BZ WANG, GF TANNER RES INC PASADENACA 91107

A finite-difference time-domain (FDTD) networking approach is applied to the full-wave analysis of the transmission properties of H-meshed-strip line. The network formulation incorporated with the FDTD method leads to... 详细信息

关键词： finite-difference time-domain method Meshed-strip line

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MODELING OF WAVE-GUIDE STRUCTURES USING THE NONORTHOGONAL FDTD method WITH A PML ABSORBING BOUNDARY

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1995年第4期8卷 226-228页

作者： WU, C NAVARRO, EA CHUNG, PY LITVA, J Communications Research Laboratory McMaster University Hamilton Ontario Canada L8S 4K1 Department of Applied Physics Universitat de València Doctor Moliner 50 46100 Burjassot (València) Spain.

In this letter, we combine the nonorthogonal FDTD method with a perfectly matched layer (PML) absorbing boundary condition to analyze waveguide structures. This combination provides a very useful numerical tool for modeling complex waveguide structures. The PML absorbing boundary condition is tested by simulation of propagation in a WR-75 rectangular waveguide. It easily gives lower than -60-dB return loss in the frequency band of interest. An E-plane, U-bend waveguide transmission line is modeled to demonstrate the usefulness of this technique. (C) 1995 John Wiley & Sons, Inc.

关键词： finite-difference time-domain method ABSORBING BOUNDARY WAVE-GUIDES

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INTEGRATION OF THE finite-difference-time-domain AND MODE-PROPAGATION-BY-FOURIER-EXPANSION methodS FOR GUIDED-WAVE DEVICE SIMULATION

INTEGRATION OF THE FINITE-DIFFERENCE-TIME-DOMAIN AND MODE-PR...

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Conference on Design, Simulation, and Fabrication of Optoelectronic Devices and Circuits, part of SPIE OE/LASE 94 Symposium

作者： HUANG, HC LO, TC LAM, LKC HONG KONG UNIV SCI & TECHNOL DEPT ELECTR & ELECTR ENGNKOWLOONHONG KONG

ISBN: (纸本)081941445X

A 3D waveguide simulation technique is presented. The technique combines the finite- difference-time-domain (FDTD) and mode-propagation-by-Fourier-expansion (MPFE) methods for guided-wave device simulation. The algorithm consists of dividing the device into a series of small sections in which the FDTD method is employed to simulate for very complete wave characteristics. In particular, the wave characteristics around abrupt junctions of the device are simulated comprehensively by this algorithm. At the end of each section, the MPFE method is applied to simulate for optical modes and their profiles. These modes and profiles are used to extract mode parameters from the FDTD results for individual mode analysis. The modes and extracted parameters are further served as inputs to the next section for continued FDTD simulation. Thus, one can simulate arbitrarily shaped and optically large devices for very complete wave characteristics by using these two methods iteratively. The technique, together with well established semiconductor process and device simulators, presents a well-rounded methodology for semiconductor integrated-optic device simulation. This simulation methodology is illustrated by simulation and analysis of a variety of silicon based electro-optic modulators and branching waveguide structures.

关键词： finite-difference time-domain method Modulators Waveguides Computer simulations Wave propagation Device simulation Cladding Channel waveguides Semiconductors Absorption

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MODELING SURFACE-PLASMON RESONANCE IN SENSORS USING finite-difference time-domain ANALYSIS

MODELING SURFACE-PLASMON RESONANCE IN SENSORS USING FINITE-D...

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Conference on Biomedical Fiber Optic Instrumentation

作者： CHRISTENSEN, D FOWERS, D UNIV UTAH DEPT ELECT ENGNSALT LAKE CITYUT 84112

ISBN: (纸本)0819414247

Surface plasmon resonance (SPR) is currently used as an optical immunassay technique for the detection of various analytes. The uniformity of the metal film and the wavefront structure of the incident beam have an effect on the sensitivity of the SPR technique, yet most analysis methods are not capable of considering inhomogeneous layers or nonplanar excitation beams. We have applied a new numerical electromagnetic method, called finite-difference time- domain (FDTD), to this problem. To correctly model the time domain behavior of the electron oscillations, the dynamic force equation is applied to a Drude free electron model of the metal. We have analyzed a particular SPR configuration consisting of an incident beam of finite size (approximating a focused beam) onto a smooth silver film, and have obtained Poynting vector plots and reflectivity data for this configuration. The angle and magnitude of minimum reflectivity are similar for the FDTD results compared to theoretical predictions, but the angular width of the reflectivity minimum is broadened. We have also analyzed a model of a rough metal film, and find that the local electric fields are enhanced near the metal edges.

关键词： Metals finite-difference time-domain method Reflectivity Sensors Surface plasmons Silver Proteins Glasses Liquids Wavefronts

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FREQUENCY-CHARACTERISTICS OF ENERGY DEPOSITION IN HUMAN-MODEL EXPOSED TO NEAR-FIELD OF AN ELECTRIC OR A MAGNETIC DIPOLE

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IEICE TRANSACTIONS ON COMMUNICATIONS 1994年第6期E77B卷 725-731页

作者： WATANABE, S TAKI, M KAMIMURA, Y UTSUNOMIYA UNIV FAC ENGN DEPT INFORMAT SCI UTSUNOMIYA TOCHIGI 321 JAPAN

The frequency characteristics of whole-body averaged specific absorption rates (SARs) in a human model exposed to a near field of an electric dipole or a magnetic dipole are calculated, using a finite-difference time-domain method. The dependences of the characteristics on the orientation of the dipole and on the distance from the source to the model are investigated. It is shown that the resonant peak of the SAR that appears in the E-polarized far-field exposure is observed only when the source is E-polarized and is located at 80 cm, while the peak vanishes or is not noted when the source is located at 40 cm and 20 cm nor when it is H-polarized. The relationships between the whole-body averaged SARs and the incident electromagnetic field strengths are also investigated. It is suggested that the spatially-averaged value of the dominating component between the electric field and the magnetic field over the space where a human body would occupy provides a relevant measure to estimate the whole-body averaged SAR of a body in the vicinity of a small radiation source.

关键词： NEAR-FIELD EXPOSURE BIOLOGICAL EFFECT SPECIFIC ABSORPTION RATE finite-difference time-domain method

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STABILITY AND PHASE ERROR ANALYSIS OF FD-TD IN DISPERSIVE DIELECTRICS

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1994年第1期42卷 62-69页

作者： PETROPOULOS, PG AUOES USAF Armstrong Laboratory TX USA

Four FD-TD extensions for the modeling of pulse propagation in Debye or Lorentz dispersive media are analyzed through studying the stability and phase error properties of the coupled difference equations corresponding to Maxwell's equations and to the equations for the dispersion. For good overall accuracy we show that all schemes should be run at their Courant stability limit, and that the timestep should finely resolve the medium timescales. Particularly, for Debye schemes it should be at least DELTAt = 10-3 tau, while for Lorentz schemes it should be DELTAt = 10-2 tau, where tau is a typical medium relaxation tim A numerical experiment with a Debye medium confirms this. We have determined that two of the discretizations for Debye media are totally equivalent. In the Lorentz medium case we establish that the method that uses the polarization differential equation to model dispersion is stable for all wavenumbers, and that the method using the local-in-time constitutive relation is weakly unstable for modes with wavenumber k such that kDELTAx > pi/2.

关键词： DISPERSIVE MEDIA finite-difference time-domain method ALGORITHM STABILITY AND PHASE ERROR RF DOSIMETRY BIOELECTROMAGNETICS

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A finite-difference time-domain SIMULATION OF POWER-DENSITY DISTRIBUTION IN A DIELECTRIC-LOADED MICROWAVE CAVITY

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JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY 1994年第3期29卷 138-148页

作者： LIU, F TURNER, I BIALKOWSKI, M Queensland Univ of Technology Brisbane

Microwave cavity heating, drying and cooking is finding use in a variety of industrial and domestic applications. In order to gain insight into the phenomena that occur inside the microwave cavity, a detailed knowledge of electric and magnetic fields together with a prediction of the power distribution in the dielectric material is necessary. In this paper, a three-dimensional finite difference time domain method is employed to analyze the field in a partially loaded rectangular cavity excited from a rectangular waveguide operating in the dominant TE10 mode. Based on this method a computer algorithm for calculating the power distribution inside a lossy material in the cavity is developed. This algorithm is tested against a Field Matching method algorithm for the case of a simply (slab) loaded cavity.

关键词： finite-difference time-domain method FIELD MATCHING method POWER DENSITY DISTRIBUTION DIELECTRIC LOADED CAVITY

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PHASE ERROR CONTROL FOR FD TD methodS OF 2ND AND 4TH-ORDER ACCURACY

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1994年第6期42卷 859-862页

作者： PETROPOULOS, PG USAF Armstrong Laboratory TX USA

For FD-TD methods we determine the spatial resolution of the discretized domain in terms of the total computation time and the desired phase error. It is shown that the spatial step should vary as DELTAx is similar to g [e(phi)/t(c)]1/s in order to maintain a prescribed phase error level e(phi) throughout the computation time t(c), where s (=2 or 4) is the spatial order of accuracy of the scheme and g is a geometric factor. Significantly, we show that the rule of thumb of using 10-20 points per wavelength to determine the spatial cell size for the standard scheme is not optimal. Our results are verified by numerical simulations in two dimensions with the Yee scheme and a new fourth-order accurate FD-TD scheme.

关键词： finite-difference time-domain method PHASE ERROR

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COMPUTER-AIDED-DESIGN OF OPTICAL INTERCONNECTS 2

COMPUTER-AIDED-DESIGN OF OPTICAL INTERCONNECTS

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Conference on Optoelectronic Interconnects II

作者： XU, CL HUANG, WP CHAUDHURI, SK CHU, ST CHROSTOWSKI, J UNIV WATERLOO DEPT ELECT & COMP ENGNWATERLOO N2L 3G1ONTARIOCANADA

ISBN: (纸本)0819414484

A CAD tool for the optical interconnects is developed and described. It is able to trace scalar or polarized electromagnetic fields propagating through complex optical waveguiding media or free space. The scattering and radiation at index discontinuities are considered and optical beams diverging from the waveguide axis may be simulated. The intra-board and inter-board optical interconnects are simulated and discussed.

关键词： Computer aided design finite-difference time-domain method Optical interconnects Radio propagation Wave propagation Free space optics Optical simulations Optoelectronics Waveguides Free space

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