High-Resolution Measurements Of The Specific Absorption Rate Produced By Small Antennas In Lossy Media

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IEEE Transactions On Instrumentation And Measurement


We describe a thermistor-based technique for measurement of the specific absorption rate (SAR) of radio frequency energy from a small antenna in lossy matter with high spatial resolution, The apparatus employs a small thermistor probe, that is moved about the antenna using a computer-controlled positioning system, The antenna is excited by pulses of radio frequency energy, and the SAR is obtained from the measured rate of temperature increase, We present a simplified thermal model to account for heating of the thermistor by the applied electromagnetic energy, Which is a major potential artifact in the method, The apparatus is useful for studies of radio frequency ablation of tissue or near-field exposures in models of the body by wireless transmitters.

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