Comparative Analysis of the Impact of Frequency on the Radius of Curvature of Single and Double Rounded Edge Hill Obstruction

Aneke Chikezie, Mfonobong Charles Uko, Swinton C. Nwokonko


In this paper, comparative analysis of the impact of frequency on the radius of curvature of single and double rounded edge hill obstruction is studied, particularly when the International Telecommunication Union (ITU) recommendation 526 version 13 method is used to compute the radius of curvature. The study is conducted with two  path profiles of  microwave links, one  with isolated  single edged hilltop and a second profile  with isolated  double edged hilltop. The frequencies considered are  from the 1.5 GHz in the L-band   to 36GHz in the K-band. The radius of curvature decreases with frequency in the case of single edged hilltop whereas the radius of curvature increases with frequency in the case of double edge hilltop. Essentially, other factors are responsible for determining whether the radius of curvature will increase or decrease with frequency.  One of such factors is the occultation distance. For all the frequencies considered, the occultation distance is 80.923 m for the single edged hilltop and 532.203m for the double edged hilltop. Further studies are therefore required to ascertain the factors that determine the exact impact of frequency on the radius of curvature for rounded edge obstructions.


Radius of Curvature; Rounded Edge Obstruction; ITU 526-13 Method; Occultation Distance; Double Edged Hilltop; Single Edged Hilltop; Fresnel Zone; Radius of Fresnel Zone

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