Measurement of the Specific Absorption Rate using a single electric field sensor

The Specific Absorption Rate (SAR) is usually measured using electric field probes based on dipole antennas, loaded with radio frequency (RF) detector diodes and connected to differential amplifiers through high-impedance transmission lines. The most common configuration consists of three mutually orthogonal electric short dipole antennas, loaded with a fast switching detector, providing broadband characteristics. In this work, we describe the measurement of the SAR with a sensor based on a single dipole antenna. It is shown that this reduces the complexity of the system without compromising the accuracy and frequency response. The probe is tested by measuring the SAR for a dual-band Planar Inverted-F antenna.