Numerical results for antenna characterization in a cylindrical scanning geometry using a spheroidal modelling

A Near-Field/Far-Field technique employing a prolate spheroidal modelling of the source is presented.The approach is devised for oblong antennas which can be accommodated within a prolate spheroid and can be applied to non-directive antennas or directive antennas on one far-field cut only. The tangential components of the electric field over the spheroidal surface are expanded by Prolate Spheroidal Wave Functions (PSWFs) so that the unknowns of the problem amount to be the representation coefficients. Such coefficients are related to the tangential components of the field measured on a cylindrical surface and are determined, in a regularized way, by a Singular Value Decomposition approach.The PSWFs are calculated according to the method devised by Adelman, Gumerov and Duraiswami. Numerical results are presented.