Numerical simulation of electromagnetic exposure in rats with alternate incidence of double wave sources

Abstract

In this study, the whole-body specific absorption rate (SARw) and tissue average specific absorption rate (SARa) of rats under alternatively incident microwave exposure (1.5 GHz and 9.4 GHz) were calculated by finite-difference time-domain (FDTD). The effects of combined and alternating microwave exposures on the SARw and SARa values of rats were discussed and compared with those of single frequency irradiation. Numerical simulation of electromagnetic exposure revealed that under double-source alternating irradiation, both SARw and SARa values of rats were affected by the combined incidences. With the increment in the duration of alternating exposure, both SARw and SARa tended to increase nonlinearly. On comparison with SARw and SARa values obtained from single frequency irradiation, it was found that the SARw value of double-source alternating irradiation was limited within the two SARw values that were determined by two individual irradiation frequencies, corresponding to 1.5 GHz and 9.4 GHz. However, the SARa value of testis tissues that back-incident short-axis polarization of double-source alternating irradiation is 31.2% higher than the maximum SARa value of the two wave sources acting alone. The SARa value (1.5 GHz, long-axis polarization; 9.4 GHz, short-axis polarization) of the spleen is 18.9% higher than the maximum SARa value of the single-wave source when the double-source is incident back.

Keywords

• composite electromagnetic field
• finite difference time-domain
• electromagnetic exposure
• specific absorption rate