volume | PIER Journals

Abstract

Electromagnetic (EM) wave absorption characteristics for a Bonsai tree are investigated at GSM-900 band. Finite Difference in Time Domain (FDTD) method is hybridized with Friis transmission equation to carry out all the required EM simulations. The tree has been modelled using CT scan based 3D dataset considering different electrical parameters. Maximum local electric (E) field, magnetic (H) field, Specific Absorption Rate (SAR) and Shielding Effectiveness (SE) have been calculated for the tree placing at distance of 5 m away from a radiating Base Station Antenna (BSA) with 20 W input power. The maximum local E field, H field, 1-g SAR and SE obtained by the simulation are found to be 70.1 V/m, 0.09 A/m, 0.135 W/kg and 13.18 dB, respectively. Plants are found to be good natural electromagnetic radiation shield.

1. Saeid, S. H., "Study of the cell towers radiation levels in residential areas," International Conference on Electronics and Communication Systems, 2013. Google Scholar

2. Genc, O., M. Bayrak, and E. Yaldiz, "Analysis of the effects of GSM bands to the electromagnetic pollution in the RF spectrum," Progress In Electromagnetics Research, Vol. 101, 17-32, 2010.
doi:10.2528/PIER09111004 Google Scholar

3. Lazzy, G. and O. P. Gandhi, "A mixed FDTD-integral equation approach for on-site safety assessment in complex electromagnetic environment," IEEE Trans. Antennas Propagation, Vol. 48, No. 12, 1830-1836, Dec. 2000.
doi:10.1109/8.901271 Google Scholar

4. Ali, M. F., S. Mukherjee, and S. Ray, "SAR analysis in human head model exposed to mobile base-station antenna for GSM-900 band," Loughborough Antennas & Propagation Conference, 289-292, Loughborough, UK, Jan. 2009, 10.1109/LAPC.2009.5352413. Google Scholar

5. Ali, M. F. and S. Ray, "SAR analysis using SFDTD and hybrid FDTD," 5th International Conference on Computers and Devices for Communication (CODEC), 1-4, MMT, Institute of Radio Physics and Electronics, University of Calcutta, India, Dec. 2012. Google Scholar

6. Nonidez, L., M. Martinez, A. Martin, M. de Mier, and R. Villar, "Using FDTD and high frequency techniques in the time domain for SAR assessment in human exposure to base-station antennas," URSI International Union of Radio Science, Proc. GA02, Jul. 8, 2002. Google Scholar

7. Schulz, J. P., U. Hartung, N. Diviani, and S. Keller, "Dangerous towers, harmless phones? Swiss newspaper coverage of the risk associated with non-ionizing radiation," Atlantic Journal of Communication, Vol. 20, No. 1, 53-70, Feb. 2012.
doi:10.1080/15456870.2012.637030 Google Scholar

8. Giliberti, C., F. Boella, A. Bedini, R. Palomba, and L. Giuliani, "Electromagnetic mapping of urban areas: The example of Monselice (Italy)," PIERS Online, Vol. 5, No. 1, 56-60, 2009.
doi:10.2529/PIERS081006112200 Google Scholar

9. American National Standard "Safety levels with respect to exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz,", ANSI/(IEEEC95.1-1992), 1992. Google Scholar

10. International Commission on Non-Ionizing Radiation Protection "ICNIRP statement-health issues related to the use of hand-held radiotelephones and base transmitters," Health Phys., Vol. 70, No. 4, 587-593, 1996. Google Scholar

11. Federal Communication Commission (FCC), 2014, , Home Page: http://www.fcc.gov. Google Scholar

12. MATLAB 7.7, The MathWorks, Inc., , 2014, http://www.mathworks.com. Google Scholar

13. Kraus, J. D. and R. J. Marhefka, Antennas for All Applications, 3rd reprint, Tata McGraw-Hill Publishing Company Limited, New Delhi, India, 2003.

14. Williams, L. and S. Rosa, "Simple derivation of electromagnetic waves from Maxwell's equations,", Online Available: http://www.santarosa.edu/~lwillia2/42/WaveEquationDerivation.pdf. Google Scholar

15. Kraus, J. D. and D. A. Fleisch, Electromagnetic with Applications, 5th Edition, International Editions, WCB McGraw-Hill Publishing Company Limited, 1999.

16. Sullivan, D. M., Electromagnetic Simulation Using the FDTD Method, IEEE Press, New York, 2000.
doi:10.1109/9780470544518

17. Watanabe, Y., T. Uchida, C. Miyazaki, N. Oka, and K. Misu, "Calculation of shielding effectiveness using non-uniform mesh FDTD method," International Symposium on Electromagnetic Compatibility, 513-516, IEICE, Kyoto, 2009. Google Scholar

18. Sullivan, D. M., "An unsplit step 3-D PML for use with the FDTD method," IEEE Microwave and Guided Wave Letters, Vol. 7, No. 7, 184-186, Jul. 1997.
doi:10.1109/75.594858 Google Scholar

19. Homsup, N. and W. Homsup, "FDTD simulation of a mobile phone operating near a metal wall," Journal of Computers, Vol. 4, No. 2, 168-175, Feb. 2009.
doi:10.4304/jcp.4.2.168-175 Google Scholar

20. Chen, H.-Y. and H.-H. Wang, "Current and SAR induced in a human tree model by the electromagnetic fields irradiated from a cellular phone," IEEE Trans. Microwave Theory Tech., Vol. 42, No. 12, 2249-2254, Dec. 1994.
doi:10.1109/22.339749 Google Scholar

21. Tang, L. and T. S. Ibrahim, "On the radio-frequency power requirements of human MRI," PIERS Online, Vol. 3, No. 6, 886-889, 2007.
doi:10.2529/PIERS061007225757 Google Scholar

22. Ali, M. F. and S. Ray, "SAR analysis in a spherical inhomogeneous human head model exposed to radiating dipole antenna for 500 MHz{3 GHz using FDTD method," International Journal of Microwave and Optical Technology, Vol. 4, No. 1, 35-40, Jan. 2009. Google Scholar

23. Krzysztofik, W. J., R. Borowiec and B. Bieda, "Some consideration on shielding effectiveness testing," Radioengineering, Vol. 20, No. 4, 766-774, Dec. 2011. Google Scholar

24. CST Microwave Studio Suite 2010, Available at: http://www.cst.com, . Google Scholar

25. Agilent Home, http://www.home.agilent.com, . Google Scholar

26. Atayero, A. A., M. K. Luka, and A. A. Alatishe, "Satellite link design: A tutorial," International Journal of Electrical & Computer Sciences, Vol. 11, No. 4, 1-6, Aug. 2011. Google Scholar

27. The Volume Library, Homepage: http://www9.informatik.uni-erlangen.de/External/vollib, . Google Scholar

28. Love, C. J., S. Zhang, and A. Mershin, "Source of sustained voltage di®erence between the xylem of a potted ficus benjamina tree and its soil," PLoS ONE, Vol. 3, No. 8, 1-5, Aug. 13, 2008. Google Scholar

29. Franchois, A., R. Lang, D. Leva, Y. Pineiro, G. Nesti, and A. Sieber, "Ground truth complex per-mittivity measurements of trees,", Online Available: http://www.esamultimedia.esa.int/conferences/98c07/papers/P003.PDF. Google Scholar

30. Soil Dielectric Properties, Online Available: http://pe2bz.philpem.me.uk/Comm/-Antenna/Info-905-Misc/soildiel.htm, . Google Scholar

31. Stevens, N. and L. Martens, "Comparison of averaging procedures for SAR distributions at 900 and 1800 MHz," IEEE Trans. on Microwave Theory and Techniques, Vol. 48, No. 11, 2180-2184, 2000.
doi:10.1109/22.884212 Google Scholar

32. Karunarathna, M. A. A. and I. J. Dayawansa, "Energy absorption by the human body from RF and microwave emissions in Sri Lanka," Sri Lankan Journal of Physics, Vol. 7, 35-37, 2006. Google Scholar

33. Masson, P. A., J. M. Ziriax, W. D. Hurt, T. J. Walters, K. L. Ryan, D. A. Nelson, K. I. Smith, and J. A. D'andrea, "Recent advancements in dosimetry measurements and modeling," NATO Science Series, Vol. 82, 141-155, Springer, 2000. Google Scholar

Dr. Md. Faruk Ali

Dr. Sudhabindu Ray