On the existence of a lower bound of SAR value for GSM mobile phone - a resonator-based analysis
Derat, B., Bolomey, J.-Ch., Leray, C
Journées Internationales de Nice sur les Antennes (JINA'2004), Nice
Specific Absorption Rate (SAR) has already been shown to strongly depend on the surface currents flowing down the chassis which somehow acts as a counterpole of the antenna. It has also been obwerved that, for currently available commercial phones, the highest SAR values appear in the GSM band (900 MHz). By using an equivalent circuit model of the antenna, chassis and head phantom combination, this paper shows the existence of a minimum for the power dissipated in the head of the user, from which a non-trivial lower bound value of SAR in the GSM band follows. A method to approximately evaluate this limit and estimate the evolution of SAR afer a modification of the antenna upon a given chassis is developed and supported by simulation results.
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