volume | PIER Journals

Abstract

The proposed theoretical path-loss prediction procedure and measured results of radio wave propagation in an orchard environment are presented. The wireless sensor network (WSN) in a Durian orchard is primarily chosen to be an example of this study. The three-dimensional (3-D) modified uniform geometrical theory of diffraction (UTD) for curved impedance surface is employed for theoretical path-loss prediction in this paper. The orchard scenario is modeled by using canonical geometries such as a dielectric flat surface and cylindrical structures with an impedance surface to respectively represent ground and trees. Moreover, since the wireless sensor node is attached to the outside peel of a hanging durian fruit, the fruit partially acts as a wireless sensor node. Therefore, to obtain greater accuracy in the source radiation pattern, the Gaussian beam (GB) expansion via the CSP technique is used for source modeling. The path loss prediction from the proposed numerical procedure and the measured results are in good agreement. The proposed numerical procedure to calculate the path loss from actual scenario of the orchard is useful for network planning such as the pre-harvesting WSN system and other orchard scenarios.

1. Bertoni, H. L., Radio Propagation for Modern Wireless Systems, Prentice-Hall, New Jersey, 2000.

2. Azevedo, J. A. R. and F. E. S. Santos, "An empirical propagation model for forest environments at tree trunk level," IEEE Trans. Antennas Propagat., Vol. 59, 2357-2367, 2011.
doi:10.1109/TAP.2011.2143664

3. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Study of propagation loss prediction in forest environment," Progress In Electromagnetics Research, Vol. 17, 117-133, 2009.
doi:10.2528/PIERB09071901

4. Gay-Fernandez, J. A., M. Garcia Sánchez, I. Cuinas, A. V. Alejos,J. G. Sanchez, and J. L. Miranda-Sierra, "Propagation analysis and deployment of a wireless sensor network in a forest," Progress In Electromagnetics Research, Vol. 106, 121-145, 2010.
doi:10.2528/PIER10040806

5. Schettino, D. N., F. J. S. Moreira, and C. G. Rego, "Effcient ray tracing for radio channel characterization of urban scenarios," IEEE Trans. Magn., Vol. 43, 1305-1308, 2007.
doi:10.1109/TMAG.2006.890976

6. Pathak, P. H., "An asymptotic analysis of the scattering of plane waves by a smooth convex cylinder," Radio Sci., Vol. 14, 419-435, 1979.
doi:10.1029/RS014i003p00419

7. Pathak, P. H., W. D. Burnside, and R. J. Marhefka, "A uniform UTD analysis of the diffraction of electromagnetic waves by a smooth convex surface," IEEE Trans. Antennas Propagat., Vol. 28, 609-622, 1980.
doi:10.1109/TAP.1980.1142396

8. Pathak, P. H., "High-frequency techniques for antenna analysis," Proc. IEEE, Vol. 80, 44-65, 1992.
doi:10.1109/5.119566

9. El-Sallabi, H. M. and P. Vainikainen, "Radio wave propagation in perpendicular streets of urban street grid for microcellular communications. Part I: channel modeling," Progress In Electromagnetics Research, Vol. 40, 229-254, 2003.
doi:10.2528/PIER02112502

10. McNamara, D. A., C. W. I. Pistorius, and J. A. G. Malherbe, Introduction to the Uniform Geometrical Theory of Di®raction, Artech House, New York, 1990.

11. Li, Y. and H. Ling, "Numerical modeling and mechanism analysis of VHF wave propagation in forested environments using the equivalent slab model," Progress In Electromagnetics Research, Vol. 91, 17-34, 2009.
doi:10.2528/PIER09012306

12. Li, Y. and H. Ling, "Investigation of wave propagation in a dielectric rod array: Toward the understanding of HF/VHF propagation in a forest," IEEE Trans. Antennas Propagat., Vol. 58, 4025-4032, 2010.
doi:10.1109/TAP.2010.2078456

13. Koutitas, G. and C. Tzaras, "A UTD solution for multiple rounded surfaces," IEEE Trans. Antennas Propagat., Vol. 54, 1277-1283, 2006.
doi:10.1109/TAP.2006.872675

14. Ghaddar, M., L. Talbi, T. A. Denidni, and A. Sebak, "A conducting cylinder for modeling human body presence in indoor propagation channel," IEEE Trans. Antennas Propagat., Vol. 55, 3099-3103, 2007.
doi:10.1109/TAP.2007.908563

15. Phaebua, K., T. Lertwiriyaprapa, C. Phongcharoenpanich, and M. Krairiksh, "Path loss prediction in durian orchard using uniform geometrical theory of diffraction," Proceedings of IEEE AP-S Int. Symp., 4 pages, 2009.

16. Lertwiriyaprapa, T., P. H. Pathak, and J. L. Volakis, "A UTD for predicting fields of sources near or on thin planar positive/negative material discontinuities," Radio Sci., Vol. 42, RS6S18, 14 pages, 2007.

17. Lertwiriyaprapa, T., P. H. Pathak, and J. L. Volakis, "An approximate UTD ray solution for the radiation and scattering by antennas near a junction between two different thin planar material slab on ground plane," Progress In Electromagnetics Research, Vol. 102, 227-248, 2010.
doi:10.2528/PIER09111809

18. Syed, H. H. and J. L. Volakis, "An asymptotic analysis of the plane wave scattering by a smooth convex impedance cylinder,", Report,Radiation Laboratory Department of Electrical Engineering and Computer Science, The University of Michigan Ann Arbor.

19. Syed, H. H. and J. L. Volakis, "High-frequency scattering by a smooth coated cylinder simulated with generalized impedance boundary conditions," Radio Sci., Vol. 26, 1305-1314, 1991.
doi:10.1029/91RS00999

20. Phaebua, K., T. Lertwiriyaprapa, C. Phongcharoenpanich, and and P. H. Pathak, "A modified UTD solution for an impedance cylinder surface," Proceedings of the Electrical Engineering/Electronics, Computer, Telecommunications, and Information Technology International Co, 208-211, 2011.

21. Sim, Z. W., R. Shuttleworth, M. J. Alexander, and B. D. Grieve, "Compact patch antenna design for outdoor RF energy harvesting in wireless sensor networks," Progress In Electromagnetics Research, Vol. 105, 273-294, 2010.
doi:10.2528/PIER10052509

22. Pearson, L. W., "A scheme for automatic computation of fock-type integrals," IEEE Trans. Antennas Propagat., Vol. 35, 1111-1118, 1987.
doi:10.1109/TAP.1987.1143985

23. Rautio, J. C., "Reflection coeffcient analysis of the effect of ground on antenna patterns," IEEE Trans. Antennas Propagat., Vol. 29, 5-11, 1980.

24. Lertwiriyaprapa, T., K. Phaebua, C. Phongcharoenpanich, and and M. Krairiksh, "Application of UTD ray solution for characterization of propagation in Thai commercial orchard," Proceedings of Int. Conf. on Electromagn. in Adv. Appl., 176-179, 2010.

25. Lertwiriyaprapa, T., P. H. Pathak, K. Tap, and R. J. Burkholder, "Application of the complex source point method for analyzing the di®raction of an electromagnetic Gaussian beam by a curved wedge using UTD concepts," Proceedings of IEEE AP-S Int.Symp., 4 pages, 2004.

26. Felsen, L. B., "Complex source point solution of the field equations and their relation to the propagation and scattering of Gaussian beams," Symposia Mathematica, Vol. 18, 39-56, 1975.

27. Tap, K., "Complex source point beam expansions for some electro-magnetic radiation and scattering problems,", Ph.D. dissertation,The Ohio State University, Columbus, OH, 2007.

28. Tokgoz, C., "Asymptotic high frequency analysis of the surface fields of a source excited circular cylinder with an impedance boundary condition,", Ph.D. dissertation, The Ohio State University, Columbus, OH, 2002.

29. Sahin, H. and N. Ay, "Dielectric properties of hardwood species at microwave frequencies," Journal of Wood Sci., Vol. 50, 375-380, 2004.

30. Peyskens, E., M. de Pourcq, M. Stevens, and J. Schalck, "Dielectric properties of softwood species at microwave frequencies," Wood Sci. and Tech., Vol. 18, 267-280, 1984.
doi:10.1007/BF00353363

31. Ford, L. H. and R. Oliver, "rimental investigation of the reflection and absorption of radiation of 9-cm. wavelength," Proc. Phys. Soc., Vol. 58, 256-280, 1945.

32. Kim, H. S. and R. M. Narayanan, "A new measurement technique for obtaining the complex relative permittivity of terrain surfaces," IEEE Trans. Geosci. Remote Sensing, Vol. 40, 1190-1194, 2002.
doi:10.1109/TGRS.2002.1010903

Dr. Kittisak Phaebua

Dr. Chuwong Phongcharoenpanich

Prof. Monai Krairiksh

Prof. Titipong Lertwiriyaprapa