A New Approach for the Evaluation of Time Averaged SAR of Multiple Emitting Antennas

This paper introduces a novel approach for the measurement of time averaged Specific Absorption Rate (SAR) for multiple emitting antennas. The proposed approach is based on the use of the phase information of the E-field phasor given by radiofrequency vector SAR measurement system, for the retrieval of the instantaneous input RMS power injected in the emitting antennas from a small number of SAR measurement points. The approach is presented for the case of two emitting antennas. Numerical validation was performed in the case of two dipole antennas radiating coherently at a single frequency.