Integral equation methods for Near-Field Far-Field transformation

Antenna measurements are often carried out in the radiating near-field of the antenna under test. Near-field transformation algorithms determine an equivalent sources representation of the antenna in an inverse process and field values in almost arbitrary distances can be computed. In this paper two integral equation methods for the near-field transformation are presented, which are especially suitable for electrically large antennas, irregular sample point distributions, higher order probes, and non-ideal measurement environments.