Aperture edge condition effect on sampling error in patterns

An analysis of the fold-over region in k-space of a sampled linear aperture shows that the error depends on the edge condition of aperture distribution. By proper normalization a single error nomograph can be produced to cover the three practical cases of interest. Because near field measurement probes are spaced a distance over the antenna, the distribution of errors changes and is reduced. The technique also gives the errors inherent in numerical integration of apertures.