Meaning
Computational methods for assessing radiofrequency exposure combine the energy absorbed from multiple simultaneous transmitters to determine total human safety compliance. When a device operates with several antennas active, spatial SAR summation provides the total specific absorption rate for a given volume of tissue. This calculation is required by regulatory bodies to ensure that the aggregate exposure remains below legal limits.
Calculation Method
Technicians identify the peak exposure locations for each individual transmitter and then apply a mathematical formula to combine them. If the antennas are separated by a sufficient distance, spatial SAR summation may involve a simple addition of the peak values. More complex scenarios require a point by point analysis of the SAR distribution across the entire test phantom.
Safety Margin
Designers use these results to adjust the power limits of the transmitters to avoid exceeding the maximum allowed exposure. By performing spatial SAR summation during the development phase, a company can ensure that the final product will pass formal certification. The results are documented in a detailed report that includes the coordinates of the peak values and the combined plots.
Regulatory Evidence
Government agencies review these summations to verify that the device is safe for close proximity use.
