| The main objective of this paper is to study the Specific Absorption Rate (SAR) and temperature features, include distribution and statistical values, of cell in a 35mm petri dish exposure to stand-wave irradiating at 1800MHz. Firstly, the irradiating system model which is composed of a waveguide (WG) chamber (size: 124*64*244mm, thickness: 2mm, mode:TE102) and monopole antenna (size: 16.7mm), is built with the commercial software Xfdtd6.3, the real 35mm petri dish model which with the mensicus at the solid/liquid interface is also built. Secondly, the SAR distribution, efficiency (ratio between the power absorbed by the sample and the incident power) and non-uniformity (ratio between the standard deviation of SAR values and the average SAR over the sample) parameter is analyzed for both the cell layer(bottom of the sample) and the whole sample, positioned in the E-maximum and H-maximum of the WG, in the E, H, k polarization. Thirdly, the irradiating system model used in the SAR analysis is rebuilt with the sar files generated by the Xfdtd in the Matlab. The rebuilt model which is used for temperature analysis is complete the same with the one used in the SAR analysis, then, the temperature computer program based on the bio-heat conduction and boundary conditions is edited by Matlab. Finally, the temperature rise of the sample varies with incident power, exposure time and also the temperature distribution is analyzed.For the WG irradiating system used in this paper, the highest efficiency is 0.3679 (W/Kg)/mW for the cell layer and 0.3766 (W/Kg)/mW for the whole sample, with the petri dish positioned in the E-maximum of the WG, in the H- polarization; the best non-uniformity is 23% for cell layer (H-maximum, k-polarization) and 32% for the whole sample (H-maximum, H-polarization); the SAR value for the temperature rise with 0.1℃in the sample is 5.8W/Kg (E-maximum, H-polarization) and 20.0W/Kg(H-maximum, E-polarization), both is satisfied the temperature rise <0.1℃under the exposure limit 2W/Kg (ICNIRP). |
