Multijurisdictional Co Location SAR Evaluation Limits for Portable Host Devices
Multijurisdictional co-location SAR evaluation requires host-level total exposure ratio analysis and spatial decoupling to ensure global market clearance.
SAR-to-Peak-Location Spatial Ratio
Meaning
Mathematical formulas help to determine if multiple radio sources within a single device create an unsafe concentration of energy. The sar-to-peak-location spatial ratio is used to assess whether the individual exposure patterns overlap enough to require a more complex combined measurement. This ratio is a tool for certifying modern devices that use multiple wireless protocols simultaneously.
Engineers rely on this calculation to avoid the need for exhaustive multi signal testing when the antennas are sufficiently far apart.
Spatial Analysis
Proximity of the peak energy spots is measured in three dimensional space within the phantom liquid. A low sar-to-peak-location spatial ratio indicates that the sources are far enough apart to be considered independent. This separation prevents the formation of a single hot spot that exceeds the safety limits.
Compliance Threshold
Regulators set a specific value that determines when the ratio is acceptable without further testing. If the sar-to-peak-location spatial ratio is below the limit the device can be certified based on the individual antenna results. Exceeding the threshold requires a more detailed evaluation of the combined fields.
Calculation Method
The formula takes the sum of the individual peak values and divides them by the distance between the peak coordinates. Applying the sar-to-peak-location spatial ratio correctly requires precise coordinate data from the laboratory scan. Accuracy in the positioning of the sensors is necessary for a valid result.