Reconstruction of Equivalent currents Using the Scalar Surface Integral Representation
Author
Summary, in English
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.
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.
Publishing year
2005
Language
English
Publication/Series
Technical Report LUTEDX/(TEAT-7131)/1-25/(2005)
Full text
Document type
Report
Publisher
[Publisher information missing]
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Keywords
- arbitrary geometric structures
- surface integral equation
- singular value decomposition
- near field to equivalent currents transformation
- radome applications
Status
Published
Report number
TEAT-7131
Research group
- Electromagnetic theory