volume | PIER Journals

Abstract

With increasing interest in the usage of wearable wireless communication technologies at 1.8 & 2.4 GHz and 5 & 9 GHz band of frequencies, investigations on the human body interaction with these devices are becoming important. This paper provides a microstrip-based multi-band monopole antenna for body Wearable Wireless Devices (WWD), covering licensed and license-free wireless technologies at UHF/UWB when placed on human body. Five parts of the body were considered to evaluate the electromagnetic (EM) effects on the body. Specific Absorption Rate (SAR) values were found to range from 0.09-0.25 W/kg by using numerical modelling. The thermal effects were investigated experimentally using infrared thermography, and temperature changes not exceeding 1˚C were noticed. Analyses of numerical, simulated and experimental results show that infrared thermography, a temperature-based technique, can be used to evaluate the compliance of WWDs with safety exposure limits for various wireless applications.

1. Foster, K. R., "Thermal and nonthermal mechanisms of interaction of radio-frequency energy with biological systems," IEEE Transactions on Plasma Science, Vol. 28, No. 1, 15-23, 2000.
doi:10.1109/27.842819 Google Scholar

2. Adair, E. R. and R. C. Petersen, "Biological effects of radiofrequency/microwave radiation," IEEE Transactions on Microwave Theory and Techniques, Vol. 50, No. 3, 953-962, 2002.
doi:10.1109/22.989978 Google Scholar

3. Chou, C.-K. and J. A. D’Andrea, "Reviews of effects of RF fields on various aspects of human health: Introduction," Bioelectromagnetics, Vol. 24, No. S6, S5-S6, 2003.
doi:10.1002/bem.10178 Google Scholar

4. Nikolaeva, E. Y., et al. "Analysis of thermal effects in human exposed to EM radiation (2D case)," Proceedings of the 9th International Seminar/Workshop on IEEE Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, DIPED 2004. Google Scholar

5. Ibrahiem, A., et al. "Analysis of the temperature increase linked to the power induced by RF source," Progress In Electromagnetics Research, Vol. 52, 23-46, 2005.
doi:10.2528/PIER04062501 Google Scholar

6. Soontornpipit, P., "Effects of radiation and SAR from wireless implanted medical devices on the human body," Journal of the Medical Association of Thailand, Vol. 95, S189-97, 2012. Google Scholar

7. Zhadobov, M., N. Chahat, R. Sauleau, C. Le Quement, and Y. Le Drean, "Millimeter-wave interactions with the human body: state of knowledge and recent advances," International Journal of Microwave and Wireless Technologies, Vol. 3, No. 2, 237-247, 2011.
doi:10.1017/S1759078711000122 Google Scholar

8. Tuovinen, T., et al. "On the evaluation of biological effects of wearable antennas on contact with dispersive medium in terms of SAR and bio-heat by using FIT technique," International Symposium on IEEE Medical Information and Communication Technology (ISMICT), 49-153, Mar. 6-8, 2013. Google Scholar

9. Thotahewa, K., J.-M. Redouté, and M. R. Yuce, "SAR, SA, and temperature variation in the human head caused by IR-UWB implants operating at 4 GHz," IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 5, 2161-2169, 2013.
doi:10.1109/TMTT.2013.2250515 Google Scholar

10. Fadhel, B. S. and M. R. Kamarudin, "EM wave effects upon the human body using UWB antennas," Journal of Info and Electronics Engineering, Vol. 4, No. 2, 158, 2014. Google Scholar

11. Francesc, S., "Radiation effects of wearable antenna in human body tissues [dissertation],", University of Colorado Springs, 2014. Google Scholar

12. Wu, T., T. S. Rappaport, and C. M. Collin, "Safe for generations to come: Considerations of safety for millimeter waves in wireless communications," IEEE Microwave Magazine, Vol. 16, No. 2, 65-84, 2015.
doi:10.1109/MMM.2014.2377587 Google Scholar

13. Siauve, N., R. Scorretti, N. Burais, L. Nicolas, and A. Nicolas, "Electromagnetic fields and human body: A new challenge for the electromagnetic field computation," The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Vol. 22, No. 3, 457-469, 2003.
doi:10.1108/03321640310474868 Google Scholar

14. Gabrie, C. G. and S. Corthout, "The dielectric properties of biological tissues: I. Literature Survey," Phys. Med. Biol., Vol. 41, 2231-2249, 1996.
doi:10.1088/0031-9155/41/11/001 Google Scholar

15. Anguera, J., A. Andújar, C. Picher, L. González, C. Puente, and S. Kahng, "Behavior of several antenna topologies near the human head at the 2.4–2.5 GHz band," Microwave and Optical Technology Letters, Vol. 54, No. 8, 1911-1916, Aug. 2012.
doi:10.1002/mop.26970 Google Scholar

16. Hernandez, S. and A. David, High Frequency Electromagnetic Dosimetry, Artech House Inc., 2009.

17. Tuovinen, T., M. Berg, K. Y. Yazdandoost, and J. Iinatti, "Ultra wideband loop antenna on contact with human body tissues," IET Microwave and Antennas Propagation, Vol. 7, No. 7, 588-596, 2013.
doi:10.1049/iet-map.2012.0082 Google Scholar

18. Klemm, M. and G. Troester, "EM energy absorption in the human body tissues due to UWB antennas," Progress In Electromagnetics Research, Vol. 62, 261-280, 2006.
doi:10.2528/PIER06040601 Google Scholar

19. Italian National Research Council, Institute for Applied Physics, homepage on Dielectric properties of body tissues, [Online], Available: http://niremf.ifac.cnr.it. Google Scholar

20. Ramesh, G., P. Bhartia, I. Bahl, and A. Ittipiboon, Microstrip Antenna Design Handbook, Artech House, 2001.

21. Hall, P. S. and Y. Hao, Antennas and Propagation for Body-centric Wireless Communications, 2nd Ed., Artech House, 2012.

22. ICNIRP Guidelines for limiting to time varying electric, magnetic, and electromagnetic fields (upto 300 GHz), Health Physics, Vol. 74, No. 4, 494-522, 1998. Google Scholar

23. IEEE Standard for Safety Levels with Respect to Human Exposure to the Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz, IEEE Std. C95.1. 2005. Google Scholar

24. Samaras, T., A. Christ, A. Klingenböck, and N. Kuster, "Worst case temperature rise in a one-dimensional tissue model exposed to radiofrequency radiation," IEEE Trans. on Biomedical Engineering, Vol. 54, No. 3, 492-496, 2007.
doi:10.1109/TBME.2006.890498 Google Scholar

25. Kritikos, H. N. and H. P. Schwan, "Potential temperature rise induced by electromagnetic field in brain tissues," IEEE Trans. on Biomedical Engineering, Vol. 26, No. 1, 29-34, 1979.
doi:10.1109/TBME.1979.326493 Google Scholar

Dr. Karthik Varshini

Professor Thipparaju Rama Rao