• Allows full sphere or partial sphere input data
  • Full correction for axially symmetric (m=±1) probes
  • Fast Fourier Transformation and self-stabilising recurrence relations allow handling of even very large antenna structures
  • Industry standard for spherical near-field to far-field transformation with probe correction
  • Independent of the actual measurement system implementation


  • Short transformation time
  • Mathematically exact pattern transformation
  • The output coordinate system may be rotated to coincide with the peak direction of the far field, which is not always coinciding with any of the measurement coordinate system axes
  • Non-Maxwellian measurement inaccuracies are averaged to physically correct output
  • Noise reduction by means of high-order spherical mode filtering

Rotation of the spherical wave coefficients

If only a certain region of the antenna pattern has interest, it is possible to perform truncated measurements and still use SNIFT for the transformation. The transformed data are referred to the measurement coordinate system, but if, for example, the region of interest does not coincide with this system (e.g. a scanned beam), the supplementary program ROSCOE can be applied to do the appropriate coordinate transformation into a system centered around the peak.

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Accurate determination of spherical harmonics

Well-founded choice of numerical implementation ensures a very stable algorithm, also for high-order harmonics. Antennas with diameters exceeding several hundred wavelengths are handled within seconds on a standard PC with accurate determination of all involved spherical harmonics.

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Your project may be complex, but we keep things simple. If you have any questions about our software or services, or you need expert consultancy, we are here to help.

Jakob Rosenkrantz de Lasson


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