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Retrieval of equivalent currents by the use of an integral representation and the extinction theorem --- radome applications

Författare:
Publiceringsår: 2010
Språk: Engelska
Sidor: 123
Publikation/Tidskrift/Serie: Series of licentiate and doctoral theses
Volym: 22
Dokumenttyp: Licentiatavhandling
Förlag: Department of Electrical and Information Technology
Additional info: Som Funder ska anges: Försvarets Materielverk

Sammanfattning

The aim of this thesis is to solve an inverse source problem. The approach is based on an integral representation together with the extinction theorem. Both a scalar and a full-wave integral representation are implemented and solved by a Method of Moment procedure. The body of revolution enables usage of a Fourier transform to reduce the dimensions of the problem. A singular value decomposition is utilized to suppress singular values in the inversion process. A nose-cone radome is diagnosed by recreating the equivalent surface currents on its surface from measured near fields.
It is shown how the radome interacts with the field, creating beam deflection, pattern distortion, etc. The phase shift of the field due to the transmission through the radome, i.e., the insertion phase delay, is visualized. Disturbances due to defects, not detectable in the measured near field, are correctly localized by the equivalent surface currents. The alteration of side and flash lobes, together with the introduction of scattering due to the defects, are also visualized. Verification is made by comparison between the calculated and measured far field.

Disputation

Nyckelord

  • Technology and Engineering
  • extinction theorem
  • inverse source problem
  • integral representation
  • radome diagnosis
  • near-field transformation

Övriga

  • Teorel: Radomes and frequency selective surfaces (FMV)
  • Electromagnetic theory
  • Gerhard Kristensson (Professor)
  • Mats Gustafsson (Professor)
  • ISSN: 1654-790X

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