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Reconstruction of equivalent currents using a near-field data transformation - with radome applications

Publiceringsår: 2005
Språk: Engelska
Sidor: 179-198
Publikation/Tidskrift/Serie: Progress in Electromagnetics Research
Volym: 54
Dokumenttyp: Artikel


Knowledge of the current distribution on a radome can be used to improve radome design, detect manufacturing errors, and to verify numerical simulations. In this paper, the transformation from near-field data to its equivalent current distribution on a surface of arbitrary material, i. e., the radome, is analyzed. The transformation is based on the scalar surface integral representation that relates the equivalent currents to the near-field data. The presence of axial symmetry enables usage of the fast Fourier transform (FFT) to reduce the computational complexity. Furthermore, the problem is regularized using the singular value decomposition ( SVD). Both synthetic and measured data are used to verify the method. The quantity of data is large since the height of the radome corresponds to 29 - 43wavelengths in the frequency interval 8.0 - 12.0 GHz. It is shown that the method gives an accurate description of the field radiated from an antenna, on a surface enclosing it. Moreover, disturbances introduced by copper plates attached to the radome surface, not localized in the measured near. eld, are focused and detectable in the equivalent currents.



  • Electrical Engineering, Electronic Engineering, Information Engineering
  • near field to equivalent currents transformation
  • singular value decomposition
  • arbitrary geometric structures
  • surface integral equation
  • radome applications


  • Electromagnetic theory
  • ISSN: 1559-8985

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