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MULTIMODE EQUIVALENT NETWORK REPRESENTATION FOR THE SCATTERING FROM MULTISTRIP GRATINGS

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1995年第6期43卷 597-603页

作者： KINOWSKI, D GUGLIELMI, M European Space Research and Technology Center Noordwijk Netherlands

In this paper, a multimode equivalent network representation (MEN) is proposed for the scattering from a multistrip grating. Previously, rigorous analytical results were developed involving gratings with one or two strips in a period. In this paper, the MEN representation is extended to planar gratings with an arbitrary number of strips or apertures per unit cell. Both TE and TM incidence are described. The extension is obtained combining the MEN formulation with the Method of Moments solution (MoM) of the relevant integral equation. The code thus obtained retains the key feature of the MEN representation, namely the frequency independence of the characterization, and is much more flexible than the analytical solutions previously derived. The MoM solution procedure is described in detail and several application examples are discussed.

关键词： Gratings Strips Transmission line matrix methods Couplings Apertures Electromagnetic scattering message-oriented middleware Integral equations Tellurium Moment methods

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BOUNDARY INTEGRAL-EQUATION TECHNIQUE FOR THE SINGULAR BEHAVIOR OF ELECTROMAGNETIC-FIELDS AT THE COMMON TIP OF METALLIC AND BI-ISOTROPIC CONES WITH ARBITRARY CROSS-SECTION

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1994年第9期42卷 1301-1308页

作者： OLYSLAGER, F Laboratory of Electromagnetism and Acoustics Department of Information Technology University of Ghent Ghent Belgium

A boundary integral equation technique is developed to determine the singular field behavior at the common tip of lossless bi-isotropic and perfectly electrically and/or magnetically conducting cones with arbitrary cross section. The kernel of the set of boundary integral equations is a Green's function defined on a spherical surface. This Green's function is the associated Legendre function of the first kind. The integral equations are solved with the Galerkin method of moments. The theory is illustrated with a number of examples that show the effects of bi-isotropy on the singular field behavior.

关键词： Integral equations Electromagnetic fields Moment methods Sections Eigenvalues and eigenfunctions message-oriented middleware Geometry Kernel Dielectrics

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TRANSLATION, ROTATION, AND SCALE INVARIANT PATTERN-RECOGNITION BY HIGH-ORDER NEURAL NETWORKS AND MOMENT CLASSIFIERS

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IEEE TRANSACTIONS ON NEURAL NETWORKS 1992年第2期3卷 241-251页

作者： PERANTONIS, SJ LISBOA, PJG UNIV LIVERPOOL DEPT ELECT ENGN & ELECTRLIVERPOOL L69 3BXENGLAND

The classification and recognition of two-dimensional patterns independently of their position, orientation, and size by using high-order networks are discussed. A method is introduced for reducing and controlling the number of weights of a third-order network used for invariant pattern recognition. The method leads to economical networks that exhibit high recognition rates for translated, rotated, and scaled, as well as locally distorted, patterns. The performance of these networks at recognizing typed and handwritten numerals independently of their position, size, and orientation is compared with and found superior to the performance of a layered feedforward network to which image features extracted by the method of moments are presented as input.

关键词： Pattern recognition Neural networks message-oriented middleware Feature extraction Pixel Size control Handwriting recognition Image recognition Moment methods Image resolution

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A MULTILEVEL FORMULATION OF THE METHOD OF MOMENTS

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1993年第5期41卷 589-599页

作者： KALBASI, K DEMAREST, KR UNIV KANSAS DEPT ELECT & COMP ENGNRADAR & REMOTE SENSING LABLAWRENCEKS 66045

The modeling of electromagnetic scattering and radiation problems using the method of moments (MoM) is limited to resonant frequencies because of the extensive computational requirements of solving large matrix equations. In this study, a multilevel formulation of MoM is presented which allows substantial computational savings and, thus, extends the application of MoM to higher frequencies. Using a hierarchy of discretization levels, the multilevel technique extracts different modal components of the solution by focusing on a specific portion of the spectrum of the solution at a given level. The fundamental features of this process for the MoM solution of the electric field integral equation (EFIE) are developed and implemented. This multilevel MoM allows the rapid evaluation of the current distributions on a variety of 2-D scatterers with thousands of unknowns in fewer than ten cycles and in fractions of the normal CPU times. The method is stable, fast, suitable for multiple excitations, and adaptable as a ''solve'' module for almost any MoM code.

关键词： Moment methods message-oriented middleware Electromagnetic scattering Equations Electromagnetic radiation Resonant frequency Radar remote sensing Remote sensing Laboratories Electromagnetic modeling

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A COMPARISON OF THE DYADIC GREENS-FUNCTION APPROACH AND THE MIXED POTENTIAL APPROACH FOR THE SOLUTION OF SURFACE INTEGRAL-EQUATIONS

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IEEE TRANSACTIONS ON MAGNETICS 1989年第4期25卷 3049-3051页

作者： GLISSON, AW JUNKER, GP Department of Electrical Engineering University of Mississippi MS USA

The application of the mixed potential and dyadic Green's function approaches to the numerical solution of surface integral equation formulations for electromagnetic radiation and scattering problems is briefly reviewed. The convergence rates of these two methods are compared for the problem of electromagnetic scattering by a two-dimensional flat strip. It is found that both methods converge well for this geometry. When the strip is subdivided in a particular manner with pulse expansion functions, however, the dyadic Green's function approach converges very rapidly.< >

关键词： Green's function methods Strips Testing Integral equations Electromagnetic scattering Geometry Conductors Wires message-oriented middleware Electromagnetic radiation

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ON THE DISCRETE RICCATI EQUATION

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IEEE TRANSACTIONS ON AUTOMATIC CONTROL 1987年第9期32卷 828-829页

作者： MORI, T FUKUMA, N KUWAHARA, M KYOTO UNIV EDUC KYOTO 612JAPAN

Several bounds have been reported recently for the trace of the solution to the discrete algebraic matrix Riccati equation. This note adds an alternative one to them.

关键词： Riccati equations Polynomials Linear systems Matrices Sufficient conditions message-oriented middleware Process control Signal processing Arithmetic Eigenvalues and eigenfunctions

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A HYBRID FINITE-ELEMENT METHOD FOR NEAR BODIES OF REVOLUTION

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IEEE TRANSACTIONS ON MAGNETICS 1991年第5期27卷 3833-3836页

作者： BOYSE, WE SEIDL, AA Lockheed Palo Alto Research Labaratory Palo Alto CA USA

A generic formulation for a hybrid finite element solution for three-dimensional electromagnetic scattering is given using the equivalent current approach. The major computational tasks involved in monostatic scattering calculations are analyzed and compared as a function of the method of implementing the near field radiation condition, i.e. Method of Moments (MOM), modal expansion (Mie series), body of revolution (BOR). A new method utilizing a BOR formulation is given which addresses these computational issues. This BOR implementation utilizes Hermite cubic basis functions and a variable number of modes per basis function in order to achieve the greatest efficiency. The combined field integral equation formulation is employed to eliminate non-physical resonances of the mesh boundary. Examples are given showing the efficiency and accuracy of this BOR code by itself, and as part of this new hybrid finite element method.

关键词： Finite element methods Electromagnetic scattering Boundary conditions Mie scattering message-oriented middleware Resonance Conductors Finite difference methods Couplings Laboratories

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INTRODUCING UNDERGRADUATES TO THE MOMENT METHOD

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IEEE TRANSACTIONS ON EDUCATION 1995年第4期38卷 385-390页

作者： WHELESS, WP WURTZ, LT Department of Electrical Engineering University of Alabama Tuscaloosa AL USA

Four application problems are presented which have been found to facilitate introductory instruction on numerical methods for undergraduate electrical engineering students. The method of moments (MOM) is introduced at the level of first principles, preparing students for subsequent advanced topics in matrix methods and developments through linear vector space theory. The problems are such that the associated computer programming assignments are straight forward, minimizing distraction from the mathematical concepts. Numerical solutions may be obtained, or verified, with a pocket calculator in some cases. Computer programs to obtain more sophisticated graphics output and to expedite solution of equations with large matrices can be progressively added as supplementary student exercises.

关键词： Moment methods message-oriented middleware Equations Electrical engineering Vectors Electromagnetics Educational institutions Programming Computer graphics

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A COMBINED FEM MOM TECHNIQUE OF COUPLING AND RADIATING APERTURES IN RECTANGULAR WAVE-GUIDE

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IEEE TRANSACTIONS ON MAGNETICS 1995年第3期31卷 1554-1557页

作者： SANGSTER, AJ WANG, HY Department of Computing and Electrical Engineering Heriot-Watt University Edinburgh UK

Waveguide coupling and radiation by means of apertures is modelled using a hybrid technique which combines the finite element method with the moment method. Unlike the conventional pulse expansion and point matching technique, it ensures the convergence of the resultant admittance matrix elements without introducing any assumptions about the field distribution on the apertures. Coupling and radiation problems formed by a conventional transverse slot in rectangular waveguide and a complex T-shaped slot in a bifurcated waveguide are examined respectively, and excellent agreement has been obtained for both cases when compared both with alternative theoretical predictions and with measurements.

关键词： message-oriented middleware Apertures Rectangular waveguides Waveguide theory Finite element methods Moment methods Convergence Admittance Transmission line matrix methods Bifurcation

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SCATTERING FROM A CAVITY-BACKED CIRCULAR APERTURE PENETRATED BY A WIRE

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IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 1992年第2期34卷 133-136页

作者： WRIGHT, DB LEE, R DUDLEY, DG CASEY, KF OHIO STATE UNIV DEPT ELECT ENGNELECTROSCI LABCOLUMBUSOH 43210 BALLENA SYST CORP ALAMEDACA 94501

The problem considered is that of a wire penetrating a circular aperture in an infinite conducting screen and entering a circular cylindrical cavity. An approximate method is developed for evaluating the fields outside the cavity for observation points located far from the aperture. Results are presented in the frequency domain which compare this far-field approximation to the method of moments solution. The presence of interior resonance features in the exterior fields is discussed.

关键词： Apertures Capacitors Wire Frequency Electromagnetic scattering Resonance Moment methods message-oriented middleware Impedance measurement Ceramics

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