Sampling and sampling-like techniques in field representation

The state of the art in antenna field sampling techniques is reviewed. Sampling techniques are based on the assumption that radiated fields can be described exactly in the case of an infinite slot in a ground plane with the electric field parallel to the slot longer direction. Examples of radiation patterns for the E and H plane radiation fields are presented. Pseudo-sampling techniques, i.e., numerical models, for any antenna are illustrated in terms of near fields for strip antennas and the far field of a spherical reflector. The pseudo-sampling technique is applicable to range-invariant calculations while true sampling schemes are range-dependent. Far field reconstruction from near field data, a technique for choosing the antenna shape once the radiation pattern is known and the required transformations are described.