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| Progress In Electromagnetics Research | ISSN: 1070-4698, E-ISSN: 1559-8985 |
Home > Vol. 98 > pp. 191-205
DESIGN ANALYSIS OF FERRITE SHEET ATTACHMENT FOR SAR REDUCTION IN HUMAN HEADBy M. T. Islam, M. R. I. Faruque, and N. MisranAbstract: In this paper, reducing Specific Absorption Rate (SAR) with ferrite sheet attachment is investigated. The finite-difference time-domain method with Lossy-Drude model is adopted in this study. The methodology of SAR reduction is addressed and then the effects of attaching location, distance, size and material properties of ferrite sheet on the SAR reduction are investigated. Computational results show that the SAR averaging over 10 gm was better than that for 1 gm and SAR reduction of 57.75% is achieved for SAR 10 gm. These results show the way to choose a ferrite sheet with the maximum SAR reducing effect for phone model.
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2. IEEE C95.1-2005 IEEE standards for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz, Institute of Electrical and Electronics Engineers, New York, NY, 2005.
3. International Non-ionizing Radiation Committee of the International Radiation Protection Association Guidelines on limits on exposure to radio frequency electromagnetic fields in the frequency range from 100 kHz to 300 GHz, Vol. 54, No. 1, 115-123 Health Physics, 1988. 4. Christopoulou, M., S. Koulouridis, and K. S. Nikita, "Parametric study of power absorption patterns induced in adult and child head models by small helical antennas," Progress In Electromagnetics Research, Vol. 94, 49-67, 2009. 5. Hirata, A., K. Shirai, and O. Fujiwara, "On averaging mass of SAR correlating with temperature elevation due to a dipole antenna," Progress In Electromagnetics Research, Vol. 84, 221-237, 2008. 6. Mahmoud, K. R., M. El-Adawy, S. M. M. Ibrahem, R. Bansal, and S. H. Zainud-Deen, "Investigating the interaction between a human head and a smart handset for 4G mobile communication systems," Progress In Electromagnetics Research C, Vol. 2, 169-188, 2008. 7. Kouveliotis, N. K. and C. N. Capsalis, "Prediction of the SAR level induced in a dielectric sphere by a thin wire dipole antenna," Progress In Electromagnetics Research, Vol. 80, 321-336, 2008. 8. Ebrahimi-Ganjeh, M. A. and A. R. Attari, "Interaction of dual band Helical and PIFA handset antennas with human head and hand," Progress In Electromagnetics Research, Vol. 77, 225-242, 2007. 9. Kuo, L. C., Y. C. Kan, and H.-R. Chuang, "Analysis of a 900/1800-MHz dual-band gap loop antenna on a handset with proximate head and hand model," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 1, 107-122, 2007. 10. Kouveliotis, N. K., S. C. Panagiotou, P. K. Varlamos, and C. N. Capsalis, "Theoretical approach of the interaction between a human head model and a mobile handset helical antenna using numerical methods," Progress In Electromagnetics Research, Vol. 65, 309-327, 2006.
11. Fung, L. C., S. W. Leung, and K. H. Chan, "An investigation of the SAR reduction methods in mobile phone application," 2002 IEEE International Symposium on EMC, Vol. 2, 656-660, Aug. 2002.
12. Habashy, T. M. and A. Abubakar, "A generalized material averaging formulation for modeling of the electromagnetic fields," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 9, 1145-1159, 2007. 13. Ali, M. and S. Sanyal, "A numerical investigation of finite ground planes and reflector effects on monopole antenna factor using FDTD technique," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 10, 1379-1392, 2007. 14. Okoniewski, M. and M. Stuchly, "A study of handset antenna and human body interaction," IEEE Trans. Microwave Theory Tech., Vol. 44, 1855-1864, Oct. 1996.
15. Wang, J. and O. Fujiwara, "Reduction of electromagnetic absorption in the human head for portable telephones by a ferrite sheet attachment," IEICE Trans. Commune., Vol. E80-B, No. 12, 1810-1815, Dec. 1997. 16. Kiminami, K., A. Hirata, Y. Horii, and T. Shiozawa, "A study on human body modeling for the mobile terminal antenna design at 400MHz band," Journal of Electromagnetic Waves and Applications, Vol. 19, 671-687, 2005. 17. Li, L. W., M. S. Leong, P. S. Kooi, and T. S. Yeo, "Specific absorption rates in human head due to handset antennas: A comparative study using FDTD method," Journal of Electromagnetic Waves and Applications, Vol. 14, 987-1000, 2000. 18. Chan, K. H., K. M. Chow, L. C. Fung, and S. W. Leung, "E®ects of using conductive materials for SAR reduction in mobile phones," Microwave and Optical Technology Letters, Vol. 44, No. 2, 140-144. 19. Wang, J. and O. Fujiwara, "FDTD computation of temperature rise in the human head for portable telephones," IEEE Trans. Microwave Theory Tech.,, Vol. 47, No. 8, 1528-1534, Aug. 1999. 20. Kuo, L. C., Y. C. Kan, and H. R. Chuang, "Analysis of a 900/1800MHz dual-band gap loop antenna on a handset with proximate head and hand model," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 1, 107-122, 2007. 21. Chou, H.-H., H. T. Hsu, H. T. Chou, K. H. Liu, and F. Y. Kuo, "Reduction of peak SAR in human head for handset applications with resistive sheets (R-cards)," Progress In Electromagnetics Research, Vol. 94, 281-296, 2009. 22. Kuo, L. C., H. R. Chuang, Y. C. Kan, T. C. Huang, and C. H. Ko, "A study of planer printed dipole antennas for wireless communication applications," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 5, 637-652, 2007.
23. Weiland, T., "discretization method for the solution of Maxwell's equations for six-component fields," Electronics and Communications (AEU), Vol. 31, 116, 1977. 24. Zygiridis, T. T., T. D. Tsiboukis, and , "Assessment of human head exposure to wireless communication devices combined electromagnetic and thermal studies for diverse frequency bands," Progress In Electromagnetics Research B, Vol. 9, 83-96, 2008. 25. Elkaramany, E. M. A. and F. G. A. El-Hadeed, "Circuit modelsfor 2-dimensional EM absorption by biological bodies," Progress In Electromagnetics Research, Vol. 66, 1-14, 2006. 26. Wu, B. I., F. C. A. I. Cox, and J. A. Kong, "Experimental methodology for non-thermal effects of electromagnetic radiation on biologics," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 4, 533-548, 2007. 27. Hawang, J. N. and F.-C. Chen, "Reduction of the peak SAR in the human head with metamaterials," IEEE Transactions on Antenna and Propagation, Vol. 54, No. 12, 3763-3770, 2006. 28. Liu, Y., Z. Liang, and Z. Yang, "Computation of electromagnetic dosimetry for human body using parallel FDTD algorithm combined with interpolation technique," Progress In Electromagnetics Research, Vol. 82, 95-107, 2008. 29. Ibrahiem, A., C. Dale, W. Tabbara, and J. Wiart, "Analysis of the temperature increase linked to the power induced by RF source," Progress In Electromagnetics Research, Vol. 52, 23-46, 2005.
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