Predicting Ground Effects of Omnidirectional Antennas in Wireless Sensor Networks
John F. Janek, Jeffrey J. Evans
DOI: 10.4236/wsn.2010.212106   PDF   HTML     9,354 Downloads   17,305 Views   Citations


Omnidirectional antennas are often used for radio frequency (RF) communication in wireless sensor networks (WSNs). Outside noise, electromagnetic interference (EMI), overloaded network traffic, large obstacles (vegetation and buildings), terrain and atmospheric composition, along with climate patterns can degrade signal quality in the form of data packet loss or reduced RF communication range. This paper explores the RF range reduction properties of a particular WSN designed to operate in agricultural crop fields to collect aggregate data composed of subsurface soil moisture and soil temperature. Our study, using simulation, anechoic and field measurements shows that the effect of antenna placement close to the ground (within 10 cm) signi?cantly changes the omnidirectional transmission pattern. We then develop and propose a prediction method that is more precise than current practices of using the Friis and Fresnel equations. Our prediction method takes into account environmental properties for RF communication range based on the height of nodes and gateways.

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J. Janek and J. Evans, "Predicting Ground Effects of Omnidirectional Antennas in Wireless Sensor Networks," Wireless Sensor Network, Vol. 2 No. 12, 2010, pp. 879-890. doi: 10.4236/wsn.2010.212106.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] L. Ruiz, T. Barga, F. Silva, H. Assuncao, J. Nogueira, and A. Loureiro, “On the Design of a Self-Managed Wireless Sensor Network,” Self-Organization in Networks Today, Vol. 43, No. 8, August 2005, pp. 95-102.
[2] J. J. Evans, J. F. Janek, A. Gum and B. L. Hunter, “Wireless Sensor Network Design for Flexible Environmental Monitoring,” Journal of Engineering Technology, Vol. 25, No. 1, 2008, pp. 46-52,.
[3] M. Golio, “The RF and Microwave Handbook,” CRC Press, LLC, USA, 2001.
[4] T. Rappaport, “Wireless Communications, Principles and Practice,” Prentice Hall, New Jersey, 1996.
[5] K. Balman and E. Jordan, “Electromagnetic Waves and Radiating Systems,” Prentice Hall, New Jersey, 1968.
[6] C. De-Santis, D. Campbell and F. Schwering, “An Array Technique for Reducing Ground Losses in Teh HF Range,” IEEE Transactions on Antennas and Propagation, Vol. 21, No. 6, November 1973, pp. 769-773.
[7] L. Braten, T. Brevivik and T. Tjelta, “Pre-dicting the Attenuation Distribution on Line-of-Sight Ra-dio Links due to Melting Snow,” Access Networks, Janu-ary 2006.
[8] B. Fong, P. Rapajic, G. Hong and A. Fong, “Factors Causing Uncertainties in Outdoor Wireless Wearable Communications,” IEEE Pervsaive Computing, Vol. 2, No. 2, April-June 2003, pp. 16-19.
[9] K. Paran and M. Kamyab, “Electromagnetic Radiation from Vertical Dipole Antennas Near Air-Lossy Soil Interface: A Finite-Difference Timedomain Simulation,” International Journal of Numerical Modeling: Electronic Networks, Devices and Fields, Vol. 18, No. 2, March 2005, pp. 119-132,.
[10] G. Anastasi, A. Falchi, A. Passarella, M. Conti and E. Gregori, “Performance Measurements of Motes Sensor Networks,” Proceedings of the 7th ACM Symposium on Modeling, Analysis and Simulations of Wireless and Mobile Systems (MSWiM04), Lago di Gardi, Italy, October 2004, pp. 174-181.
[11] J. Thelen, D. Goense and K. Langendoen, “Radio Wave Propagation in Potato Fields,” Proceedings from the 1st Workshop on Wireless Network Measurements, Venice, Italy, February 2005.
[12] R. S. Elliot, “Antenna Theory and Design,” John Wiley & Sons, Inc, Hoboken, 1981.
[13] Ansoft Corporation, “Hfss,” April 2007,
[14] W. L. Stutzman, “Antenna Theory and Design,” John Wiley & Sons, Inc., Hoboken, 1981.
[15] C. Ichelin, J. Ollikainen and P. Vainkainen, “Effects of RF Absorbers on Measurements of Small Antennas in Small Anechoic Chambers,” IEEE Aerospace and Electronic Systems So-ciety, Vol. 16, No. 11, November 2001, pp. 17-20.
[16] J. Appel-Hansen, “Reflectivity Level of Radio Anechoic Chambers,” IEEE Transactions on Antennas and Propa-gation, Vol. 21, No. 4, July 1973, pp. 490-498.
[17] J. D. Krause, “Antennas,” McGraw-Hill, Inc., 1988.

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