Differential method for determining the specific absorption rate coefficient of electromagnetic energy for a liquid phantom

The wide use of small-sized wearable electronic devices in various practical human activities makes it relevant to measure the proportion of electromagnetic energy absorbed by the human body. One of the most important parameters that determines it is the specific absorption rate. In this article we propose a method for determining this coefficient for a liquid phantom, with the use of computer simulation and experimental measurement of the microstrip patch antenna parameters.

The antenna is located on an elliptical cylinder and operates in the medical body area network. The method is based on measuring the rise in temperature of the liquid phantom exposed to electromagnetic waves generated by a microstrip antenna over a given time. Homogeneous liquid phantom was created by changing the percentage of salt and sugar in 250 g of water, skin phantom – by changing the percentage of water in 200 g of glycerol. The proposed specific absorption rate measurement method eliminates the need to purchase an expensive set of dielectric probes, which demonstrates its cost-effectiveness. The obtained results of experimental measurements are in good agreement with the results of the performed computer simulation.

1. Kumar V., Gupta B. Wireless Personal Communications. 2017, vol. 97, pp. 5865–5895. https://doi.org/10.1007/s11277-017-4815-x

2. Самойлов В. О., Владимиров В. Г., Шарова Л. А. Радиобиология неионизирующих и ионизирующих излучений: учебное пособие. СПб.: Изд-во Политехнического ун-та, 2011. 207 c. [Samoilov V. O., Vladimirov V. G., Sharova L. A. Radiobiology of non-ionizing and ionizing radiation. St. Petersburg, Publ. House of the Polytechnic University, 2011, 207 p.]

3. Kudryashov Yu. B., Perov Yu. F., Rubin A. B. Radiation biophysics: radio frequency and microwave electromagnetic radiation: textbook for universities. Moscow, Fizmatlit Publ., 2008, 184 p.]

4. Rano D., Hashmi M. IET Microwaves, Antennas and Propagation. 2019, vol. 13, no.7, pp. 1031–1040. https://doi.org/10.1049/iet-map.2018.6021

5. Rano D., Hashmi M. S. 2016 Twenty Second National Conference on Communication (NCC). 2016, pp. 1–6. https://doi.org/10.1109/NCC.2016.7561201

6. Yargin S. V. On the biological effect of electromagnetic radiation in the radio frequency range, Siberian Scientific Medical Journal. 2019, 39(5), pp. 52–61. (In Russ.)] https://doi.org/10.15372/SSMJ20190506

7. Yargin S. V. On the issue of biological effects of electromagnetic radiation in the radio frequency range, Technique. Technology. Engineering. 2017, no. 3(5), pp. 14–19. (In Russ.)]

8. Gao Y., Ghasr M. T., Nacy M., Zoughi R. In IEEE Transactions on Instrumentation and Measurement, Feb. 2019, vol. 68, no. 2, pp. 512–524. https://doi.org/10.1109/TIM.2018.2849519

9. Januszkiewicz Ł., Hausman S. 2015 9th European Conference on Antennas and Propagation (EuCAP). 2015, pp. 1–4.

10. Kiminami K., Iyama T., Onishi T., Uebayashi S. In IEEE Transactions on Electromagnetic Compatibility. Nov. 2008, vol. 50, no. 4, pp. 828–836. https://doi.org/10.1109/TEMC.2008.2004608

11. Okano Y., Sato T., Sugama Y. In IEEE Transactions on Instrumentation and Measurement. June 2010, vol. 59, no. 6, pp. 1705–1714. https://doi.org/10.1109/TIM.2009.2022449

12. Okano Y., Shimoji H. In IEEE Transactions on Instrumentation and Measurement. Feb. 2012, vol. 61, no. 2, pp. 439–446. https://doi.org/10.1109/TIM.2010.2045939

13. Okano Y., Ito K., Ida I., Takahashi M. In IEEE Transactions on Microwave Theory and Techniques. Nov. 2000, vol. 48, no. 11, pp. 2094–2103. https://doi.org/10.1109/22.884200