Dosimetry for biological tissues exposed to ultra-wideband microwave signals

The novel technique was applied to improve the dosimetry of exposure to ultra-wideband (UWB) signals. In order to investigate the biological effects, the numerical simulation for in vitro study has been carried out for the widely used 90 mm Petri dishes filled with human blood and exposed to high power microwave pulses in an anechoic chamber. Electric and magnetic vectors of the incident field were parallel to the surface of Petri dishes. According to the actual safety standards the SAR is a basic restriction parameter for protecting against thermal effects in the risk assessment study. The simulation has been performed to maintain uniformity of the specific absorption rate (SAR) distribution in the specimen. The novel attempt at the dosimetry takes into account calculation of SAR of all frequency harmonics of the spectrum of UWB with regard to permittivity of the medium (human blood) in the analyzed frequency range