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  • 1
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    Transient scattering from two-dimensional dielectric cylinders of arbitrary shape (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: In this work, the problem of transient scattering by arbitrary shaped two-dimensional dielectric cylinders is solved using the marching-on-in-time (MOT) technique. The dielectric problem is approached via the surface equivalence principle. A pair of coupled integral equations are derived by enforcing the continuity of the electric and magnetic fields which are solved by using the method of moments. Numerical results are presented for two cross sections, viz. a circle and a square, and compared with inverse discrete Fourier transform (IDFT) techniques. In each case, good agreement is obtained with the IDFT solution.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 40; 9; p. 1054-1060.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Transient scattering from dielectric cylinders - E-field, H-field, and combined field solutions (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In this work, the problem of transient scattering by arbitrarily shaped two-dimensional dielectric cylinders is solved using the marching-on-in-time technique. The dielectric problem is approached via the equivalence principle. Three different formulations, namely, the electric field integral equation formulation, the magnetic field integral equation formulation, and the combined field integral equation formulation are considered. Numerical results are presented for two cross sections, namely, a circle and a square, and compared with inverse discrete Fourier transform (IDFT) techniques. In each case, good agreement is obtained with the IDFT solution.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Radio Science (ISSN 0048-6604); 27; 5; p. 611-622.
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    NASA TECHNICAL REPORTS
  • 3
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    Electromagnetic scattering from arbitrary shaped conducting bodies coated with lossy materials of arbitrary thickness (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A simple and efficient numerical technique is presented to solve the electromagnetic scattering problem of coated conducting bodies of arbitrary shape. The surface equivalence principle is used to formulate the problem in terms of a set of coupled integral equations involving equivalent electric and magnetic surface currents which represent boundary fields. The conducting structures and the dielectric materials are modeled by planar triangular patches, and the method of moments is used to solve the integral equations. Numerical results for scattering cross sections are given for various structures and compared with other available data. These results are proved accurate by a number of representative examples.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 39; 627-631
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of a slot loaded microstrip disk antenna for circular polarisation (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A method is presented to analyze a circular microstrip disk antenna loaded with a narrow, inclined slot at its center and fed by a coaxial probe. Making use of the exact dyadic Green's functions for a grounded dielectric slab due to electric and magnetic currents, Richmond's reaction integral equation in conjunction with the method of moments (Galerkin), a generalized h-parameter equivalent network for the loaded patch is obtained. An expression for the input impedance of a slot loaded microstrip patch is obtained from the equivalent parameters. The theoretical results are compared with the experiment.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Archiv fuer Elektronik und Uebertragungstechnik (ISSN 0001-1096); 45; 386-389
    Format: text
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    NASA TECHNICAL REPORTS
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