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International Journal of Antennas and Propagation
Volume 2010 (2010), Article ID 245070, 4 pages
Research Article

Calculation of Effective Earth Radius and Point Refractivity Gradient in UAE

Electrical Engineering Department, Ajman University of Science and Technology, Al-Jurf, P.O. Box 346 Ajman, UAE

Received 1 April 2010; Accepted 21 May 2010

Academic Editor: Tat Yeo

Copyright © 2010 Abdulhadi Abu-Almal and Kifah Al-Ansari. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A large set of 14 years of reliable local radiosonde meteorological data, from 1990 to 2003, has been used to calculate the effective Earth radius and point refractivity gradient in the United Arab Emirates. The obtained values are used to investigate their impact on the design of microwave links. The cumulative distribution of the refractivity gradient in the first 65 meters above the ground surface, the monthly distribution for the median value of the k-factor, as well as their comparison with the ITU-maps are provided. Both experimental and global standard values are applied to specific link budget calculations.