Reconstruction of equivalent currents using a near-field data transformation - with radome applications
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, 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.
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.
Publishing year
2004
Language
English
Publication/Series
Technical Report LUTEDX/(TEAT-7125)/1-15/(2004)
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-7125
Research group
- Electromagnetic theory