## Abstract

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, ie the radome, is analyzed. The transformation is

based on a full vector surface integral representation that relates the

equivalent currents to the near-field data.

Measured near-field data originating from a reflector antenna

is then examined. The field irradiates a radome whereupon it is

measured on a cylindrical surface. The quantity of data is large since

the height of the radome corresponds to $29-43unit{wavelengths}$ in

the frequency interval $8.0-12.0unit{GHz}$. 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).

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, ie the radome, is analyzed. The transformation is

based on a full vector surface integral representation that relates the

equivalent currents to the near-field data.

Measured near-field data originating from a reflector antenna

is then examined. The field irradiates a radome whereupon it is

measured on a cylindrical surface. The quantity of data is large since

the height of the radome corresponds to $29-43unit{wavelengths}$ in

the frequency interval $8.0-12.0unit{GHz}$. 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).

Original language | English |
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Title of host publication | Proceedings of Radiovetenskap och kommunikation |

Number of pages | 6 |

Publication status | Published - 2005 |

Event | Nordic Conference on Radio Science and Communications, 2005 - Linköping, Linköping, Sweden Duration: 2005 Jun 14 → 2005 Jun 16 |

### Conference

Conference | Nordic Conference on Radio Science and Communications, 2005 |
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Abbreviated title | RVK 05 |

Country/Territory | Sweden |

City | Linköping |

Period | 2005/06/14 → 2005/06/16 |

## Subject classification (UKÄ)

- Electrical Engineering, Electronic Engineering, Information Engineering

## Keywords

- near field to equivalent currents transformation
- singular value decomposition
- radome applications
- surface integral equation
- arbitrary geometric structures