NEAR-FIELD TO FAR-FIELD TRANSFORMATION WITH PLANAR SPIRAL SCANNING

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...

Differences between Modal Expansion and Intergral Equation Methods for Planar Near-field to Far-field Transformation

On the Near-Field Sampling and Truncation Errors in Planar Time-Domain Near-Field to Far-Field Transformation

This paper studies the effect of three important parameters in planar time-domain (TD) near-field (NF) to far-field (FF) transformation. These parameters are the NF spatial sampling, NF measurement distance and scan surface truncation. The effect of these parameters over the TD FF accuracy are difficult to predict for Ultra Wide Band antennas. In this paper we aim to choose the optimum NF measu...

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...

An Alternative Spherical near Field to Far Field Transformation