Arbitrary wave synthesis using spectral transformations

The different transformations among plane, cylindrical and spherical spectrum allow to tackle the arbitrary field synthesis from a set of known sources. Putting all the spectrums in the same coordinate axis we can obtain a system of equations that allows us to find the optimal source weights, which synthesize the wished field. In this paper we present how to get the minimum number of sources needed to obtain a plane wave that allows to measure antennas or radar cross section in an indoor near-fleld range.