Near-field Approach to Rapid Sar Measurement of Mobile Phones

Specific Absorption Rate (SAR) constitutes a key issue for mobile phones. Indeed, SAR which represents the power per unit mass delivered in biological tissues must comply with existing standards. The averaged SAR required by standards can be deduced from the measurement of E-field distribution in a volume of biological phantoms, filled with a tissue equivalent liquid. Such a standard procedure is time consuming and rather incompatible with the rapidity required for developing new mobile phone models. This paper describes a new rapid SAR measurement approach based on near-field techniques. The use of a plane wave decomposition of the measured field in a plane allows the reconstruction of the electric field in the phantom from which the averaged SAR can be deduced. The combination of this approach a with probe array technology should bring real-time SAR measurements possibilities.