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

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 - 12.0 GHz. It is shown that the method gives an accurate description of the field radiated from an antenna, on a surface enclosing it. Moreover, disturbances introduced by copper plates attached to the radome surface, not localized in the measured near. eld, are focused and detectable in the equivalent currents.

• Författare: Kristin Persson; Mats Gustafsson
• Avdelning/ar: Institutionen för elektro- och informationsteknik
• Publiceringsår: 2005
• Språk: Engelska
• Sidor: 179-198
• Publikation/Tidskrift/Serie: Progress in Electromagnetics Research-Pier
• Volym: 54
• Länkar: http://dx.doi.org/10.2528/PIER04111602
• Dokumenttyp: Artikel i tidskrift
• Förlag: EMW Publishing
• Ämne: Electrical Engineering, Electronic Engineering, Information Engineering
• Nyckelord: near field to equivalent currents transformation; singular value decomposition; arbitrary geometric structures; surface integral equation; radome applications
• Status: Published
• Forskningsgrupp: Electromagnetic theory
• ISBN/ISSN/Övrigt: ISSN: 1070-4698