Fully probe-corrected near-field far-field transformation employing plane wave expansion and diagonal translation operators

Carsten H. Schmidt, Martin M. Leibfritz, Thomas F. Eibert

Research output: Contribution to journalArticlepeer-review

114 Scopus citations

Abstract

Near-field antenna measurements combined with a near-field far-field transformation are an established antenna characterization technique. The approach avoids far-field measurements and offers a wide area of post-processing possibilities including radiation pattern determination and diagnostic methods. In this paper, a near-field far-field transformation algorithm employing plane wave expansion is presented and applied to the case of spherical near-field measurements. Compared to existing algorithms, this approach exploits the benefits of diagonalized translation operators, known from fast multipole methods. Due to the plane wave based field representation, a probe correction, using directly the probe's far-field pattern can easily be integrated into the transformation. Hence, it is possible to perform a full probe correction for arbitrary field probes with almost no additional effort. In contrast to other plane wave techniques, like holographic projections, which are suitable for highly directive antennas, the presented approach is applicable for arbitrary radiating structures. Major advantages are low computational effort with respect to the coupling matrix elements owing to the use of diagonalized translation operators and the efficient correction of arbitrary field probes. Also, irregular measurement grids can be handled with little additional effort.

Original languageEnglish
Pages (from-to)737-746
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume56
Issue number3
DOIs
StatePublished - Mar 2008
Externally publishedYes

Keywords

  • Diagonal translation operators
  • Fast multipole method (FMM)
  • Near-field far-field transformation
  • Near-field measurements
  • Plane wave expansion

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