Preliminary Studies: Far-Field Microwave Dosimetric Measurements of a Full-Scale Model of Man

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Abstract
Measurements of microwave heating were made in a full-size, upright human model. The 75 kg model, composed of electrically simulated muscle, was placed in the far-zone of a standard-gain horn inside an absorber-lined chamber. Pulsed energy at 1.29 GHz was obtained from a military radar transmitter and produced radiation at 6-14 mW/cm2 average power density at the location of the model. Microwave heating at the front surface was measured at 9 locations on the phantom. Several depths within the phantom were measured at a central location to gain information on the depth-of-penetration of the microwave energy. The frontal surface measurements and penetration study permitted a calculation of the approximate whole-body average specific absorption rate (SAR) when the model''s long axis was parallel to the E-field vector. For a normalized power density of 1 mW/cm2 at a frequency of 1.29 GHz, the whole-body average SAR approximated 0.03 W/kg. This model agrees with theoretical predictions based on absorption in prolate spheroidal models of man.

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