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      A high-frequency based asymptotic solution for surface fields on a source-excited sphere with an impedance boundary condition

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      Author
      Alisan, B.
      Ertrk V. B.
      Date
      2010-10-05
      Source Title
      Radio Science
      Print ISSN
      0048-6604
      Publisher
      Wiley-Blackwell Publishing
      Volume
      45
      Issue
      5
      Pages
      1 - 14
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      A high-frequency asymptotic solution based on the Uniform Geometrical Theory of Diffraction (UTD) is proposed for the surface fields excited by a magnetic source located on the surface of a sphere with an impedance boundary condition. The assumed large parameters, compared to the wavelength, are the radius of the sphere and the distance between the source and observation points along the geodesic path, when both these points are located on the surface of the sphere. Different from the UTD-based solution for a perfect electrically conducting sphere, some higher-order terms and derivatives of Fock type integrals are included as they may become important for certain surface impedance values as well as for certain separations between the source and observation points. This work is especially useful in the analysis of mutual coupling between conformal slot/aperture antennas on a thin material coated or partially coated sphere.
      Keywords
      Geodesic paths
      High frequency HF
      High-frequency asymptotics
      Higher order
      Impedance boundary conditions
      Magnetic sources
      Mutual coupling
      Observation point
      Perfect electrically conducting
      Thin materials
      Asymptotic analysis
      Boundary conditions
      Electromagnetic wave scattering
      Permalink
      http://hdl.handle.net/11693/22177
      Published Version (Please cite this version)
      http://dx.doi.org/10.1029/2010RS004367
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      • Department of Electrical and Electronics Engineering 3524
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