Determination of Single Knife Edge Equivalent Parameters for Triple Knife Edge Diffraction Loss by Giovanelli Method

Ezenugu Isaac A

doi:10.11648/j.ijics.20170201.12

Abstract

In this paper, the computation of triple knife edge diffraction loss by Giovanelli multiple knife edge diffraction loss method is presented for a 10 GHz Ku-band microwave link. Also, the computation of equivalent single knife edge obstruction that will replace the triple obstruction by giving the same diffraction loss as the dual obstructions is presented. The results shows that for the triple obstructions (M1, M2 and M3) the total diffraction loss is 59.5095778 dB as computed by the Giovanelli method. The individual diffraction loss from obstructions M1, M2 and M3 are 13.3856983 dB, 29.59291 dB and 16.5309693 dB respectively. Furthermore, a single knife edge obstruction located at the middle of the link (dt = dr = 4475m) and with LOS clearance height of 1237.591 m will be give the same diffraction loss as the three knife edge obstructions M1, M2 and M3. Essentially, the line of sight clearance height of the equivalent single knife edge obstruction are much more than the sum of the line of sight clearance height of the three original obstructions.

Highlights

In wireless communication systems, pathloss is one of the major components used in link budgeting to determine the expected received signal strength [1,2,3,4,5,6]
The listed are approximation method for determination of the effective diffraction loss that can be caused by a given set of multiple knife edge obstructions in the signal path. knife edge diffraction using he Giovaneli method is presented for a 10GHz Ku-band microwaave link
Based on the three knife edge obstructions (M", M# and M$) in Figure 1 the following procedure is used in Giovaneli method to determine the effective diffraction loss due to the three knife edge obstructions

Summary

Introduction

Pathloss is one of the major components used in link budgeting to determine the expected received signal strength [1,2,3,4,5,6]. Pathloss can be caused by many effects, such as free-space loss, refraction, diffraction, reflection, aperture-medium coupling loss, and absorption. When there are two or more of such knife edge obstructions, multiple knife edge diffraction loss methods can be employed to determine the effective diffraction loss of all the knife edge obstructions [24]. The listed are approximation method for determination of the effective diffraction loss that can be caused by a given set of multiple knife edge obstructions in the signal path. Knife edge diffraction using he Giovaneli method is presented for a 10GHz Ku-band microwaave link. International Journal of Information and Communication Sciences 2017; 2(1): 10-14

Giovanelli Multiple Knife Edge Diffraction Loss Method

Results and Discussions

Conclusions