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Computational Electromagnetics and Its Applications, 1999. Proceedings. (ICCEA '99) 1999 International Conference on

Date 4-4 Nov. 1999

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  • 1999 International Conference on Computational Electromagnetics and its Applications. Proceedings (ICCEA'99) (IEEE Cat. No.99EX374)

    Publication Year: 1999
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  • Contents

    Publication Year: 1999 , Page(s): i - xii
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  • Rigorous analysis of rectangular groove waveguide

    Publication Year: 1999 , Page(s): 23 - 26
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  • Integral of double bessel's function of three-dimensional electromagnetic scattering in tem theory1

    Publication Year: 1999 , Page(s): 30 - 33
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  • Electromagnetic fields and dispersion curves in circular conducting chirowaveguides

    Publication Year: 1999 , Page(s): 34 - 37
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  • Analysis of transmission line equations at high frequency*

    Publication Year: 1999 , Page(s): 38 - 41
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  • Discussion of the nonlinear effects in the fiber due to HIEMP

    Publication Year: 1999 , Page(s): 345 - 348
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  • Plane wave scattering by a step on infinite perfect conducting plane surface

    Publication Year: 1999 , Page(s): 439 - 441
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  • Author index

    Publication Year: 1999 , Page(s): 631 - 636
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  • Analysis of power/ground bounces on the conductive planes in high-speed MCM with a novel method

    Publication Year: 1999 , Page(s): 589 - 592
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    In this letter, a novel method is proposed to analyze the power/ground bounces in a high-speed MCM layout system, which is based on the partial element equivalent circuit method combined with the block reduction algorithm and recursive convolution time-domain macromodel. It has the advantage of simple parameter extraction, high efficiency and high precision. View full abstract»

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  • Composite effect of crop (wheat) on microwave (X-band) for remote sensing

    Publication Year: 1999 , Page(s): 509 - 512
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    This paper deals with the study of microwave scattering from narrow leaf crop (wheat) and crop covered moist soil for remote sensing. Monitoring soil and vegetation biophysical status on regional and global scales is of paramount importance for understanding and protecting the environment as well as for management of natural resources. For this purpose, the potential of remote sensing techniques are also recognised. The knowledge of the target characteristic must be known through the ground base remote sensing, In this paper, the crop (wheat) covered moist soil (SM), plant height (PH), leaf area index (LAI), percentage biomass (BIO), and total chlorophyll (TC) have been taken as targets. Wheat is botanically considered as a narrow leaf crop. Its bed was specially prepared for the microwave scattering measurements. Using a bistatic scatterometer, several observations were carried out for various growth stages of the crop, which lead to the study of the crop signature. The emissivity (e) has been computed from the collected data and its effect on PH, SM, LAI, BIO, TC have been analysed. The effect of (e) gives a linear relationship on SM. The results obtained from the empirical model have been compared with the experimentally observed values. It is observed for both like polarisation that the value of (e) decreases as the SM increases. View full abstract»

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  • Modeling and inversion of azimuthal lateral resistivity logging

    Publication Year: 1999 , Page(s): 601 - 604
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    The three-dimensional finite element method (FEM) is employed to simulate the response of an azimuthal lateral sonde in a borehole surrounded by inhomogeneous formations. The results demonstrate that, if the formation inhomogeneity is not significant, the measured resistivities at different azimuths are close to true formation resistivities. When the formation inhomogeneity is significant, however, the measured resistivity (Rt) distribution at different azimuths could be substantially different from the true distribution. The measured Rt distributions tend to smear the contrasts between the lowest and the highest Rt values. The responses at high resistivity areas are much lower than the correspondent true values. It is necessary to correct for the measured resistivities in these cases. As an improvement to the traditional linear correcting methods in the inversions, a nonlinear inversion scheme is developed in this paper to calculate the true Rt distribution. The numerical results demonstrate the feasibility of this nonlinear method. View full abstract»

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  • Obtaining the real height profile of ionospheric electron density with BP network

    Publication Year: 1999 , Page(s): 311 - 313
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    Multi-layer feed forward neural networks can approximate any nonlinear mapping. Because of this nature it is used to solve inverse problems. When we apply BP network to inverse the real height profile of ionospheric electron concentration from the ionogram obtained by vertical sounding, the maximum relative error is less than 1%. View full abstract»

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  • The analysis of a broadband slotted ridged waveguide antenna

    Publication Year: 1999 , Page(s): 171 - 174
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    In this paper, a novel broadband slotted waveguide antenna is presented. A double-slot structure and a ridged waveguide are used. The structure of the double-slot is analyzed by means of the transmission line model. The analysis shows that the theoretical design is in good agreement with experimental results. View full abstract»

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  • A part time terminated bandpass source scheme in FDTD calculations

    Publication Year: 1999 , Page(s): 60 - 62
    Cited by:  Papers (2)
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    A new part time terminated band-pass source scheme is presented for finite difference time domain (FDTD) calculations in electromagnetic simulations. This source scheme has the band-pass spectrum and the exciting time is much shorter than the ones presented earlier and significant CPU time is saved under the new exciting source. View full abstract»

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  • An efficient analytical formula for analyzing optical waveguide discontinuities

    Publication Year: 1999 , Page(s): 325 - 328
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    An efficient analytical formula for analyzing optical waveguide discontinuities is presented in this paper. By using the Tappert-Lee approximation and method of lines we get an analytic expression of the square-root operator. The FFT technique is used to accelerate the multiplication of matrices. A comparison to published results shows very good agreement. View full abstract»

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  • Optimization of the current integration method for a parabolic reflector antenna

    Publication Year: 1999 , Page(s): 179 - 182
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    This work centers on the optimization of the current integration method for the determination of the field radiated by a centered parabolic reflector fed at the focus. To this end, by considering the primary field source as enclosed in an oblate spheroid, a nonredundant sampling representation of the physical optics currents, induced on the reflector by the electromagnetic field radiated from the primary field source, is developed. This allows one to reduce the number of points where the knowledge of the currents is required so that the computational time decreases. The advantages are more significant in the case of electrically large reflector antennas, as those used in satellite earth stations or in radio astronomy, and in particular when the field from the primary field source is computationally onerous. Numerical tests assess the effectiveness of the proposed approach. View full abstract»

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  • Direct amplitude optimization and quantization for ultralow sidelobe phased arrays

    Publication Year: 1999 , Page(s): 183 - 186
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    In this paper, a new amplitude quantization synthesis method for ultralow sidelobe phased arrays is proposed. This method is based on the constrained nonlinear optimization algorithm. By introducing a set of critical constraint conditions into the optimization model, we can directly quantize the amplitude distribution of an array instead of replacing it with a continuous equivalent aperture antenna. The mutual coupling and the element patterns are also considered in the quantization synthesis. Finally two array simulation results are given to show the effectiveness of this method. View full abstract»

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  • Electromagnetic backscattering by a finite-length rectangular trough in a finite flat plate

    Publication Year: 1999 , Page(s): 420 - 424
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    This paper focuses on the electromagnetic backscattering from a finite-length rectangular trough in a flat plate of finite dimension. Based on the method of dyadic Green's functions and geometrical theory of diffraction (GTD), the magnetic field integrated functions (MFIF) of this problem are obtained. The physical basis formulation, as introduced by Richmond (see IEEE Trans. Antennas and Propagation, vol.33, p64-8, 1985), is used to express the unknown currents in the trough aperture, and the Galerkin solution is used to compute the MFIF. Finally the RCS of such a trough is computed, and some plots are obtained and compared. View full abstract»

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  • The electromagnetic simulation software package MAFIA 4

    Publication Year: 1999 , Page(s): 565 - 568
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    MAFIA 4 is a general purpose electromagnetic simulation software package, which has found wide application in various research and industrial institutions. The program is based on the finite integration theory and covers all main aspects of this grid-based discrete electromagnetic field theory. New developments for MAFIA 4 are the TL3 code module for simulation of transient magnetoquasistatic fields including effects of nonlinear material and eddy currents induced by moving conductors and the module H3 for coupled transient thermal and electromagnetic field simulation. The FDTD code-module T3 now features gyrotropic materials using a state space formulation and perfectly matched layer boundary conditions. The postprocessor of the package is enhanced with a comfortable VRMIL 2.0 visualization facility. View full abstract»

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  • On the application of absorbing boundary conditions in 2-D CSAMT sounding forward modeling by the finite element method

    Publication Year: 1999 , Page(s): 90 - 94
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    This paper is on the application of absorbing boundary conditions for the 2-D controlled source audiofrequency magnetotelluric (CSAMT) sounding calculation by the finite element method. In geophysical electromagnetic field problems, the absorbing boundary condition is introduced, which makes the boundless region convert into the finite and provides a promising method for calculation of multi-mediums. View full abstract»

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  • Synthesis algorithm for millimeter-waves radial-line slot array antenna

    Publication Year: 1999 , Page(s): 156 - 159
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    A millimeter-wave linear-polarized radial-line slot array (RLSA) antenna for the 30-34 GHz frequency band is considered from theoretical and experimental points of view. This planar antenna has numerous attractive features like high efficiency, high gain and mass production feasibility due to printed circuit technology. Theoretical models as a basis for the design procedure are studied. Experimental results for verification of the developed design approaches are also presented and discussed. View full abstract»

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  • High output photodetector and CPW-fed slot antenna array for millimeter-wave fiber-radio system

    Publication Year: 1999 , Page(s): 337 - 340
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    In this paper, we present experimental results on millimeter-wave photodetection for a fiber-radio system. The experiment shows about 10 dBm and 7 dbm millimeter-wave output from the photodetector at 38 GHz and 60 GHz, respectively, which is close to the required power for a direct fed indoor millimeter-wave radiation system. To efficiently radiate the obtained millimeter-wave power, a CPW-fed slot antenna array directly integrated with the photodetector was designed and fabricated on a glass substrate at 38 GHz and 60 GHz. Simulation results for the antenna are also presented. View full abstract»

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  • Electromagnetic scattering from 2D band-limited fractal surface using Kirchhoff approximation

    Publication Year: 1999 , Page(s): 456 - 459
    Cited by:  Papers (3)
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    A normalized two-dimensional band-limited Weierstrass fractal function is presented for modelling the rough surface. An analytic solution of the scattered field and variance of scattered intensity from the fractal surface are given based on Kirchhoff theory. The influence of fractal dimension, the patch size of the surface and the fundamental wavenumbers on the scattering field is discussed by theoretical analysis and numerical calculations. View full abstract»

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  • A new indoor ray-tracing propagation prediction model

    Publication Year: 1999 , Page(s): 540 - 542
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    By making use of two-dimensional (2D) ray-tracing model results, a new propagation prediction model for wireless communications in indoor environments is developed. It is more accurate than 2D models and more efficient than three-dimensional (3D) ray-tracing models for getting the path loss of any point on single floors of buildings. A ray-tracing algorithm for propagation prediction based on GO (geometrical optics) and UTD (uniform theory of diffraction) is presented. The simulation agrees well with measurement. View full abstract»

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