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Absorbing boundary conditions for FDTD simulations of photonic crystal waveguides

IEEE MICROWAVE AND GUIDED WAVE LETTERS 1999年第12期9卷 502-504页

作者： Mekis, A Fan, SH Joannopoulos, JD MIT Dept Phys Cambridge MA 02139 USA

We present a novel numerical scheme for the reduction of spurious reflections in simulations of electromagnetic wave propagation in photonic crystal waveguides. We use a distributed Bragg reflector waveguide termination to reduce reflection from photonic crystal waveguide ends by improving k-matching for photonic crystal waveguided modes. We describe computational procedures and exhibit that a significant reduction in reflection amplitude can be achieved across a large part of the guided mode spectrum. This method enables one to reduce simply and effectively the computational requirements in photonic crystal waveguide simulations.

关键词： absorbing boundary conditions finite-difference time-domain method photonic crystal waveguide

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FDTD analysis of electromagnetic penetration into a rectangular enclosure with multiple rectangular apertures

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1999年第3期22卷 188-191页

作者： Park, HH Kim, BW Chung, YC Lee, JG Korea Adv Inst Sci & Technol Dept Elect Engn Electromagnet Wave Lab Yusung Gu Taejon 305701 South Korea Korea Res Inst Stand & Sci Elect Compatabil Grp Taejon South Korea

The shielding effectiveness of a rectangular enclosure with multiple apertures is investigated using the finite-difference time-domain (FDTD) method. It is shown that increasing the number of apertures influences the shielding effectiveness of the rectangular enclosure. The arrangement of the apertures is found to affect the shielding properties as well. (C) 1999 John Wiley & Sons, Inc.

关键词： finite-difference time-domain method shielding effectiveness electromagnetics

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Analysis of transient electromagnetic fields based on the vector potential function

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IEEE TRANSACTIONS ON MAGNETICS 1999年第3期35卷 1410-1413页

作者： Georgieva, N Chen, ZZ Bhartia, P Dalhousie Univ DalTech Halifax NS B3H 3J5 Canada Def Res Estab Ottawa ON K1A 0Z4 Canada

The recently developed time-domain vector-potential (TDVP) technique is presented in this paper together with its new applications to the analysis of antenna radiation problems. The time-domain governing equations of the magnetic vector potential and the respective boundary conditions arising in the analysis of multilayer structures are derived and their numerical implementation is briefly explained. The numerical features, efficiency and applicability of the method are discussed and compared with other commonly used time-domain algorithms.

关键词： time domain analysis finite-difference time-domain method printed antennas

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FDTD analysis of serial corner-fed square patch antennas for single- and dual-polarised applications

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IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION 1999年第3期146卷 205-208页

作者： Gao, SC Li, J Shanghai Univ Dept Commun Engn Jiading 201800 Peoples R China Fuyang Normal Univ Dept Comp Fuyang 236032 Peoples R China

The finite-difference time-domain (FDTD) method is developed for the analysis of serial corner-fed square patch antennas. A special technique to model the slanted metallic boundaries of the patch antenna has been used in the general FDTD algorithm to avoid the staircase approximations. The method improves the accuracy of the original FDTD algorithm without increasing its complexity. Both the one-port and two-port cases are studied, which are for single- and dual-polarised applications, respectively, Several antenna elements are manufactured. An isolation of -25dB is achieved by the two-port antenna, which makes it suitable for many dual-polarised applications. The numerical analysis is confirmed by the experimental results and by results published elsewhere.

关键词： Antenna theory two-port antenna finite difference time-domain analysis slanted metallic boundaries electromagnetic wave polarisation one-port antenna Single antennas microstrip antennas FDTD analysis antenna theory numerical analysis dual-polarised applications single-polarised applications finite-difference time-domain method Other numerical methods serial corner-fed square patch antennas

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Characteristics of aperture-coupled cylindrical dielectric resonator antennas on a thick ground plane

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IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION 1999年第6期146卷 439-442页

作者： Guo, YX Luk, KM Leung, KW City Univ Hong Kong Dept Elect Engn Hong Kong SAR Peoples R China

The aperture-coupled cylindrical dielectric resonator antenna (DRA) on a thick ground plane is investigated using the finite-difference time-domain method and verified by measured results. Reasonable agreements are obtained. It is found that increasing the thickness of the ground plane would reduce the coupling from the feedline to the antenna. The I-I-shaped coupling slot is also studied numerically in addition to the standard rectangular slot. The results show that the H-shaped slot provides better coupling to the DRA than the rectangular slot with the same slot length.

关键词： H-shaped coupling slot finite difference time-domain analysis measured results Single antennas feedline-antenna coupling same-slot length thick ground plane aperture-coupled cylindrical dielectric resonator antennas microstrip antennas Waveguide and microwave transmission line components Other dielectric applications and devices dielectric resonators Other numerical methods microstrip line finite-difference time-domain method rectangular slot electromagnetic coupling antenna feeds

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Mutual coupling between rectangular dielectric resonator antennas by FDTD

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IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION 1999年第4期146卷 292-294页

作者： Guo, YX Luk, KM Leung, KW City Univ Hong Kong Dept Elect Engn 83 Tat Chee Ave Kowloon Peoples R China

The mutual coupling between aperture-coupled rectangular dielectric resonator antennas is analysed using the finite-difference time-domain method. The perfectly matched layer is used as absorbing boundary conditions. The voltage excitation source of microstrip structure is based on a simple model, in which the source plane or the terminal plane can be moved very close to the discontinuity so that the computational domain can be reduced substantially. Numerical results are verified by measurements and good agreement between theory and experiment is obtained. The method is highly efficient for the analysis of DR array antennas.

关键词： voltage excitation source finite difference time-domain analysis aperture-coupled antennas Antenna arrays discontinuity dielectric resonators dielectric resonator array antennas perfectly matched layer electromagnetic coupling microstrip structure source plane finite-difference time-domain method mutual coupling numerical results rectangular dielectric resonator antennas absorbing boundary conditions Other dielectric applications and devices Other numerical methods terminal plane microwave antenna arrays FDTD

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An analysis of the finite-difference time-domain method for modeling the microwave heating of dielectric materials within a three-dimensional cavity system

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JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY 1996年第4期31卷 199-214页

作者： Zhao, H Turner, IW School of Mathematics Queensland University of Technology Brisbane QLD 4001 Australia

In this paper, an investigation of the microwave heating of a lossy material located inside a cavity by the finite-difference time-domain (FD-TD) method is undertaken. The emphasis of this work focuses on the performance of the FD-TD method when certain traditional assumptions are used within the framework of the model. The limitations of these assumptions will be deliberated and more accurate counterparts will be proposed and tested. In particular, it will be shown that when only a single mode is assumed to exist around the aperture between the waveguide and the cavity, spurious numerical results arise. Further, the numerical simulation indicates that the treatment of the interfacial boundary condition located between free-space and the material becomes very important when predicting the dissipated power distribution for a lossy dielectric material. A new approximation of this interfacial boundary condition is developed and a comparison between existing and new methodologies is made. The treatment of singular field behavior near sharp edges of the cavity is also examined and a study of the effect of using different techniques to model regions where this condition arises is presented. In order to validate the numerical simulation results, comparisons against experimental data sets previously reported in the literature will be made. In summary, the new techniques proposed in this research yield a solution of high accuracy and demonstrate an increased flexibility for simulating microwave systems. It will be shown that the FD-TD method satisfies the important Maxwell equation field divergence condition everywhere within the applicator.

关键词： finite-difference time-domain method multimode cavity input waveguide interface boundary condition edge behavior power density distribution

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Radiation force exerted on subwavelength particles near a nano-aperture

Radiation force exerted on subwavelength particles near a na...

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International Conference on Optical Sensing and Nanotechnology (ICOSN 99)

作者： Okamoto, K Kawata, S Osaka Univ Dept Appl Phys Suita Osaka 565 Japan

ISBN: (纸本)0819432148

We investigate the possibility of optical trapping by evanescent photons localized near a subwavelength aperture. The radiation force exerted on a dielectric sphere near the aperture is numerically analyzed, and the result shows that the force on the sphere is attractive to the aperture. It is also found that the magnitude of the radiation force is larger than those of two other forces, the gravity and the force due to thermal fluctuation in water.

关键词： radiation force finite-difference time-domain method optical trapping evanescent field sub-wavelength aperture

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A PML-FDTD formulation for the simulation of optical structures

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1999年第5期22卷 355-358页

作者： AlSunaidi, MA ElSallal, W King Fahd Univ Petr & Minerals Dhahran 31261 Saudi Arabia

A formulation of the PML technique suitable for the FDTD simulation of optical structures is presented. The FDTD formulation is based on the scalar-wave equation. The resulting algorithm is stable, efficient, and effective. Numerical results show that the technique provides an excellent level of absorption with a reasonable amount of absorbing thickness. (C) 1999 John Wiley & Sons, Inc.

关键词： finite-difference time-domain method dielectric waveguides optical structures

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Analysis of photonic crystals for light emitting diodes using the finite difference time domain technique

Analysis of photonic crystals for light emitting diodes usin...

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SPIE Conference on Physics and Simulation of Optoelectronic Devices

作者： Boroditsky, M Coccioli, R Yablonovitch, E Univ Calif Los Angeles Dept Phys Los Angeles CA 90024 USA

ISBN: (纸本)0819427225

The finite difference time domain method has been used to analyze the dispersion diagram of a photonic crystal comprised of a perforated dielectric slab and the properties of a micro-cavity formed by introducing a defect into such a crystal. Computational requirements of the method, its advantages and disadvantages, and results for the structure analyzed are discussed.

关键词： Photonic crystals Crystals Dielectrics finite-difference time-domain method Light emitting diodes Wave propagation Dispersion Electromagnetism Radio propagation Modulation

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