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

Författare:
Publiceringsår: 2004
Språk: Engelska
Sidor:
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7125)/1-15/(2004)
Volym: TEAT-7125
Dokumenttyp: Rapport
Förlag: [Publisher information missing]

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.

Nyckelord

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

Övriga

Published
  • Electromagnetic theory-lup-obsolete

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