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

Publiceringsår: 2004
Språk: Engelska
Sidor: 15
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7125)/1-15/(2004)
Dokumenttyp: Rapport
Additional info: Published version: Progress in Electromagnetics Research, Vol. 54, pp. 179-198, 2005.

Sammanfattning

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, i.e., the radome, is analyzed. The
transformation is based on the 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 vast 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, defects on the radome,
not localized in the measured near field, are focused and detectable on the
radome surface.

Disputation

Nyckelord

  • Technology and Engineering
  • arbitrary geometric structures
  • surface integral equation
  • singular value decomposition
  • near field to equivalent currents transformation
  • radome applications

Övriga

Published
TEAT-7125
  • Electromagnetic theory

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