Meaning
Spatial sampling interval defines the distance between discrete measurement points across a planar or conformal surface during electromagnetic field mapping. Establishing an appropriate area scan grid resolution ensures that local field maxima are detected before executing high-density three-dimensional evaluations. Standard compliance frameworks specify upper bounds for grid pitch based on the radio frequency band under evaluation.
When spatial increments exceed half the wavelength in the phantom substrate, localized energy peaks fall between observation points.
Spatial Density
Measurement grids determine how effectively an automated probe maps the electric field distribution along a device enclosure. Fine area scan grid resolution prevents under-sampling near antenna elements or conductive housing features where localized field gradients remain steep. If the probe step distance is too broad, peak spatial-average specific absorption rates are underestimated prior to the follow-up volumetric evaluation.
RF test plans mandate specific step dimensions to capture relevant spatial peaks reliably.
Measurement Accuracy
Electric field sensors record scalar or vector field values at each discrete node across the designated plane. High area scan grid resolution increases test duration while improving the fidelity of spatial interpolation algorithms. When field gradients change rapidly over short distances, coarse sampling introduces interpolation errors that obscure the true maximum absorption region.
Automated SAR test systems rely on precise positioning to ensure valid field mapping.
Compliance Limit
Regulatory compliance depends on adhering to standardized spatial grid criteria during certification testing. Setting an compliant area scan grid resolution guarantees that subsequent volumetric scans capture the actual highest exposure zone. Failure to satisfy grid limits invalidates test reports submitted to telecommunication regulators.
Laboratory accreditation standards demand verification of grid positioning repeatability before issuing compliance certificates.
