The accurate and highly stable SNIFT software transforms measured spherical near-field antenna data to far fields, accounting for the full characteristics of the measuring probe.
Allows full sphere or partial sphere input data
Full correction for m=±1 probes
Fast Fourier Transformation and self-stabilizing 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
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.
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.
Fast transformation time
Mathematically exact pattern transformation
The output pattern may be given in coordinate system rotated to peak direction of the far field
Non-Maxwellian measurement inaccuracies are averaged to physically correct output
Noise reduction by means of high-order spherical mode filtering