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Analysis of resonance processes in microstrip ring resonators by the FDTD method

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第5期28卷 312-321页

作者： Semouchkina, E Cao, WW Mittra, R Yu, WH Penn State Univ Mat Res Lab University Pk PA 16802 USA Penn State Univ Dept Math University Pk PA 16802 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA

In this paper, the finite-difference time-domain method is used to analyze resonance processes in microstrip ring resonators, which are either edge or side coupled to the feedlines, in both the time and frequency domains. Standing waves established in resonant structures are visualized by simulating the spatial distribution of electromagnetic fields at resonant frequencies. The wave processes, which determine the resonance formation in edge- and side-coupled resonators, are found to be significantly different in these two structures. (C) 2001 John Wiley & Sons, Inc.

关键词： microwave resonator microstrip ring finite-difference time-domain method electromagnetic waves resonance

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Efficient determination of resonance frequencies in resonant structures using the FDTD method

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第4期28卷 244-247页

In this paper, we present a finite-difference time-domain technique for determining the resonance frequencies of microwave components by deriving the standing-wave patterns rather than simulating the scattering parameter spectra of the component. We show that, compared to the S-parameter spectra simulation technique, the technique proposed herein can save the time needed to compute the resonant frequencies by an order of magnitude. (C) 2001 John Wiley & Sons, Inc.

关键词： microwave resonator finite-difference time-domain method resonance frequency scattering parameters

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FDTD and PSTD simulations for plasma applications

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IEEE TRANSACTIONS ON PLASMA SCIENCE 2001年第2期29卷 341-348页

作者： Fan, GX Liu, QH Hutchinson, SA Duke Univ Dept Elect & Comp Engn Durham NC 27708 USA Sandia Natl Labs Albuquerque NM 87185 USA

Three-dimensional finite-difference time-domain (FDTD) and pseudospectral time-domain (PSTD) algorithms, with perfectly matched layer absorbing boundary condition, are presented for nonmagnetized plasma as a special case of general inhomogeneous, dispersive, conductive media. The algorithms are tested for three typical frequency bands, and an excellent agreement between the FDTD/PSTD numerical results and analytical solutions is obtained for all cases. Several applications, such as laser-pulse propagation in plasma hollow channels, surface-wave propagation along a plasma column of finite length, and energy deposition of electron cyclotron resonance plasma source, demonstrate the capability and effectiveness of these algorithms. The PSTD algorithm is more efficient and accurate than the FDTD algorithm, and is suitable for large-scale problems, while the FDTD algorithm is more suitable for fine details. The numerical results also show that plasma has complex transient responses, especially in the low-frequency and resonance regimes, Because of their flexibility and generality, the algorithms and computer programs can be used to simulate various electromagnetic waves-plasma interactions with complex geometry and medium properties, both in time and frequency domains.

关键词： finite-difference time-domain method perfectly matched layer plasma plasma applications plasma sources pseudospectral time-domain method

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A new 3-D FDTD multigrid technique with dielectric traverse capabilities

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 2001年第3期49卷 422-430页

作者： White, MJ Yun, ZQ Iskander, MF Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

The finite-difference time-domain (FDTD) technique has become increasingly popular and is being used to model extremely complex and electrically large structures, These simulations are computationally demanding and often exceed available limits on computer resources, In this paper, we present an FDTD sub-gridding technique that allows for increased resolution in regions of interest without increasing the overall computational requirements beyond the available resources. Furthermore, the formulation presented here allows for traversing dielectric boundaries using any integer refinement factor and the maximum Courant number By allowing the coarse-/fine-grid boundary to traverse dielectric boundaries, numerical simulations that were previously either extremely difficult or impossible to perform are now possible. The technique presented here uses a weighted current value from the coarse region at the boundary between the fine- and coarse-grid regions to update the fine-region tangential fields on that boundary, The weighting function depends on the material properties and the relative position of the fine-region electric field within the current contour at the boundary. The complete formulation of this new technique is described and some results of simulation cases are presented to validate the accuracy and stability of the newly developed FDTD code. Simulations include simple cases where the analytical solution exists and more complex cases, which were impossible to model using a uniform-grid FDTD code, In some simulation examples, computer memory savings as high as 70 times what would have been necessary with a uniform-grid code were achieved, It is shown that errors of less than 2% are achievable with ratios of coarse-to-fine grid sizes exceeding ten, The new technique is expected to be used in simulating many electrically large and complex structures in the biomedical microwave processing of materials and the wireless communications areas.

关键词： complex structures dielectric traverse electrically large finite-difference time-domain method multigrid sub-gridding

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Numerical simulation on read-out characteristics of the planar aperture-mounted head with a minute scatterer

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2001年第3B期40卷 1542-1547页

作者： Tanaka, K Ohkubo, T Oumi, M Mitsuoka, Y Nakajima, K Hosaka, H Itao, K Univ Tokyo Grad Sch Frontier Sci Bunkyo Ku Tokyo 1138656 Japan Seiko Instruments Inc Matsudo Chiba 2702222 Japan

Recently, various researches on optical recording based on near-field optical principles have been conducted for higher data storage density. However, there is a problem of the trade-off between signal output and spatial resolution, especially when an aperture-type near-field optical head is utilized for high speed data-readout. In order to solve this problem, we propose a novel near-field optical head, the planar aperture-mounted head with a minute scatterer. and analyze its read-out performance through the three-dimensional finite-difference time-domain (3D-FDTD) method. Our simulations reveal that the Silver scatterer placed at the center of the planar aperture strongly enhances optical energy due to the local surface plasmon excitation, and that this head has the potential to realize high resolution and high signal output simultaneously.

关键词： near-field optics near-field optical head scatterer plasmon excitation finite-difference time-domain method

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finite-difference time-domain analysis on nonlinear Fabry-Perot resonator in optical waveguide geometry

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 2001年第4A期40卷 2259-2263页

作者： Fujii, M Okamoto, T Haraguchi, M Fukui, M Al-Bader, SJ Univ Tokushima Fac Engn Dept Opt Sci & Technol Tokushima 7708506 Japan King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

The finite-difference time-domain (FDTD) method is applied to investigate the characteristics of nonlinear Fabry-Perot (FP) resonators in optical waveguide geometries. Our treatment, which is the extension of Tran's method developed to analyse the characteristics of nonlinear photonic crystals, correctly reproduces analytical results on optical bistabilities of the FP resonator provided by Chen and Mills in 1987. It is found that the minimum power required for optical bistabilities is significantry decreased by adopting the optical waveguide geometry, compared with the case of Chen and Mills, i.e., a conventional nonlinear FP interferometer.

关键词： finite-difference time-domain method nonlinear Fabry-Perot resonator third-order nonlinear optical effect guided optics

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Numerical modeling and experimental investigation of resonance properties of microwave capacitors

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第1期29卷 54-60页

作者： Semouchkina, E Cao, WW Mittra, R Lanagan, M Penn State Univ Mat Res Lab University Pk PA 16802 USA Penn State Univ Dept Math University Pk PA 16802 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA

The finite-difference time-domain (FDTD) field simulations have been employed to visualize standing-wave patterns in single-layer, rectangular, planar capacitors and capacitor chips. These patterns are used for the analysis of the resonant mode types, and for the determination of the resonance frequencies. The results of simulation are experimentally verified by measuring the S-parameter spectra. In addition, we show that the dimensions of the capacitor plates can be optimized in order to maximize the first resonant frequency of the capacitor, rendering it useful for high-frequency applications. (C) 2001 John Wiley & Sons, Inc.

关键词： microwave capacitors finite-difference time-domain method

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Integrated multibeam dual-polarised planar array

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IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION 2001年第3期148卷 174-178页

作者： Gao, SC Li, LW Leong, MS Yeo, TS Natl Univ Singapore Dept Elect & Comp Engn Singapore 119260 Singapore

A novel four-beam dual-polarised microstrip antenna array at the 10GHz band is presented. By using a multilayered structure and multiport slot-coupled microstrip lines, two Butler matrix microstrip circuits corresponding to two orthogonal polarisations can be located on different substrate lavers (above and below the ground plane) and integrated with a patch array. The antenna has eight input ports corresponding to two orthogonal polarisations and four beams. The theoretical design is based on the finite-difference time-domain (FDTD) method. The measured return loss and isolation characteristics exceed 10 and 23 dB, respectively, in the 9.7-10.3GHz band. The radiation pattern is close to an ideal Butler pattern and the cross-polarisation level is lower than -18dB in the beams. Details of the antenna and its characteristics are presented.

关键词： multiport networks microstrip antenna arrays finite difference time-domain analysis Antenna arrays FDTD method stacked microstrip patches planar antenna arrays Butler matrix microstrip circuits electromagnetic wave polarisation patch array orthogonal polarisations four-beam microstrip antenna array radiation pattern antenna radiation patterns finite-difference time-domain method 9.7 to 10.3 GHz return loss integrated multibeam dual-polarised planar array multilayered structure substrate layers multiport slot-coupled microstrip lines H-plane patterns cross-polarisation level ideal Butler pattern Other numerical methods isolation characteristics multibeam antennas

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Numerical analysis of optical modes in two-dimensionally ordered polystyrene spheres in attenuated total reflection geometry

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2001年第4A期40卷 2286-2291页

作者： Haraguchi, M Fukui, M Nakai, T Okamoto, T Shinya, A Koda, T Shimada, R Ohtaka, K Univ Tokushima Fac Engn Dept Opt Sci & Technol Tokushima 7708506 Japan Japan Womens Univ Fac Sci Dept Math & Phys Bunkyo Ku Tokyo 1128681 Japan Chiba Univ Fac Engn Dept Appl Phys Inage Ku Chiba 2638522 Japan

We have numerically calculated attenuated total reflection (ATR) signals due to two-dimensionally ordered (2D) spheres on a glass substrate for both TE- and TM-polarized incident light beams using a finite difference time-domain method. The calculated ATR spectra are in good agreement with the experimental ones reported previously by Lis. From the ATR spectra and the spatial distribution of light intensity, it has been found that the ATR dips are due to the excitation of the optical modes in the 2D spheres. The propagation length of the optical modes is confirmed to be comparable to the diameter of the sphere. It indicates that the optical modes propagate in a variety of fashions and the light intensity in the 2D spheres takes a maximum value at the contact points between the spheres.

关键词： ordered spheres microsphere light propagation light coupling gallery mode evanescent light attenuated total reflection finite-difference time-domain method

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Combining FDTD simulations with measurements of microstrip ring resonators for characterization of low- and HIGH-K dielectrics at microwaves

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第1期29卷 21-24页

作者： Semouchkina, E Cao, WW Lanagan, M Mittra, R Yu, WH Penn State Univ Mat Res Lab University Pk PA 16802 USA Penn State Univ Dept Math University Pk PA 16802 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA

This paper shows how the dielectric constant of alumina and rutile substrates at microwave frequencies can be accurately determined by fitting the simulated S-parameter spectra of microstrip ring resonators, generated via the finite-difference time-domain (FDTD) method, to experimentally measured data. The proposed method does not require the determination of the effective dielectric constant and the approximate closed-form expressions to find the true permittivity of the substrate. This is essential for the characterization of high-K dielectric materials at high frequencies when the closed-form expressions are invalid. (C) 2001 John Wiley & Sons, Inc.

关键词： finite-difference time-domain method dielectric characterization microwave measurements microstrip ring resonator

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