Abstract
A radio system conveys information from transmitter to the receiver. The information can be sent by any antenna that transforms the RF signal into an electromagnetic wave through free space medium for electromagnetic wave propagation. Long-distance data communication has been higher in effect through wireless networks. Generally, VHF and UHF radio frequencies are termed as line-of-sight (LOS). In point of fact, the considered horizon for visual LOS is not the identical as the horizon for radio wave propagation as geographic obstacles and the earth curvature limits LOS transmission. This research provides an overview, study, analysis, and implementing simulations with single-antenna and two-antenna systems using MATLAB programming language related to antenna height effect on determining the distance range that can be expected in a radio line of sight data link. Also, the effect of weather and earth terrain changes effects on coverage distance is also taken in consideration when doing analysis. The city of Baghdad (from many locations in the world) is assumed as the place where the research ideas are applied.
Highlights
Wireless communication stands for the biggest technological contributions to mankind, involving the information transmission over a distance wirelessly
This paper investigates VHF and UHF bands communications as a result of their important applications, and due to the fact that their coverage distance is directly and strongly affected by antenna height, weather and earth terrain changes
The Effect of Antenna Height on Coverage Distance: To measure the effect of antenna height on coverage distance according to equations (1) (2), and (3), we assume that propagation is perfect which means that K-factor is 4/3
Summary
Wireless communication stands for the biggest technological contributions to mankind, involving the information transmission over a distance wirelessly. VHF stands for an International Telecommunication Union (ITU) termed for radio waves within 30-300 MHz frequency range based on applied wavelengths within 1-10 meter [4]. This paper investigates VHF and UHF bands communications as a result of their important applications (as mentioned in above paragraph), and due to the fact that their coverage distance is directly and strongly affected by antenna height, weather and earth terrain changes.
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