DISCUSSION PAPER: STRONG DEPENDENCE OF WHOLE ANIMAL ABSORPTION ON POLARIZATION AND FREQUENCY OF RADIO‐FREQUENCY ENERGY*

Abstract

A two-plate stripline is used to determine wide-band radio-frequency (285-4000 MHz) absorption characteristics of 96-390-g rats and brain-phantom prolate spheroidal bodies. The results compare well to those for free space irradiation. At resonance, for E along the long dimension (â), a power deposition nine times higher than that for the H parallel â orientation is observed. For rats in the k parallel â configuration, the frequencies of peak absorption and the maximum absorption at these values demonstrate W-1/3 and W 2/3 dependencies, respectively, upon the weight W of the animal. This finding implies that whole animal absorption is a size- and shape-dependent phenomenon.