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Reconstruction of Equivalent currents Using the Scalar Surface Integral Representation

Publiceringsår: 2005
Språk: Engelska
Sidor: 25
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7131)/1-25/(2005)
Dokumenttyp: Rapport
Ytterligare information: Published version: Electromagnetic Waves PIER 54, Ed. J.A. Kong, pp. 179-198, EMW Publishing, Cambridge, Massachusetts, USA, 2005.


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 − 12.0GHz. 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 field, are focused and detectable in the equivalent
currents. The method also enables us to determine the phase shift of the
field due to the passage of the radome, cf. the insertion phase delay.



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


  • Electromagnetic theory

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