What is it about?
Typically, the received signal in telecommunication systems increases with antenna gain. Although this is true for a line-of-sight (LOS) scenario, the same may be not true for non-line-of-sight (NLOS) links. In this case, using very high gain antennas can be much worse than using a small, low gain antenna.
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Why is it important?
The proper antenna must be determined as a function of the propagation environment.
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This page is a summary of: Impact of the antenna directivity on path loss for different propagation environments, IET Microwaves Antennas & Propagation, October 2015, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-map.2015.0194.
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