A new strategy to reduce the truncation error in near-field/far-field transformations


  • O. M. Bucci,

  • G. D'Elia,

  • M. D. Migliore


A new strategy to reduce the far-field reconstruction error due to the finite size of the measurement region in planar and cylindrical near-field/far-field transformation techniques is presented. The approach exploits the (spatial) band-limitation property of the radiated field in order to estimate the field outside the measurement area. A number of different estimation algorithms are investigated, with reference to both the accuracy of the estimation and the required computational effort. Numerical and experimental results show that with a small computational effort, it is possible to obtain a significant improvement of the reconstructed far-field pattern with respect to that obtained without near-field extrapolation.