NEAR-FIELD-FAR-FIELD TRANSFORMATION TECHNIQUE WITH HELICOIDAL SCANNING FOR ELONGATED ANTENNAS

Near-field — Far-field Transformation Technique with Helicoidal Scanning for Elongated Antennas

A fast and accurate near-field — far-field transformation technique with helicoidal scanning is proposed in this paper. It is tailored for elongated antennas, since a prolate ellipsoid instead of a sphere is considered as surface enclosing the antenna under test. Such an ellipsoidal modelling allows one to consider measurement cylinders with a diameter smaller than the antenna height, thus redu...

A Nonredundant Near-Field to Far-Field Transformation with Spherical Spiral Scanning for Nonspherical Antennas

A fast and accurate near-field – far-field transformation technique with spherical spiral scanning tailored for nonspherical antennas, i.e., radiating systems with two dimensions very different from the third one, is developed in this paper. To this end, an antenna with one or two predominant dimensions (e.g., base station antennas and reflectarrays) is no longer considered as enclosed in a sph...

Experimental Results Validating the Near-Field to Far-Field Transforma- tion Technique with Helicoidal Scan

This paper concerns the experimental validation of the near-field – far-field transformation technique with helicoidal scanning. Such a technique, based on the theoretical results concerning the nonredundant sampling representations of the electromagnetic fields, makes use of a two-dimensional optimal sampling interpolation formula to reconstruct the near-field data needed to perform the classi...

An Alternative Spherical near Field to Far Field Transformation

The Unified Theory of Near-field–far-field Transformations with Spiral Scannings for Nonspherical Antennas

The unified theory of near-field–far-field transformations with spiral scannings for quasi-spherical antennas is extended in this paper to the case of nonspherical ones, i.e., antennas with two dimensions very different from the third one. To this end, these antennas are no longer considered as enclosed in a sphere, but in a proper convex domain bounded by a rotational surface. The extension, h...