Besides depending on frequency band isolation and physical space separation to reduce signal interference, the directional antenna could be positioned to eliminate unnecessary contamination of radiation in certain areas. In the cellular system using three directional antennas at each cell site can form each sect ionized cell.
In most cases omni directional antennas are used. The coverage of the signal strength from an omnidirectional antenna should take the shape of a smooth circle if the ground is perfectly flat. In hilly terrain the coverage of an omnidirectional antenna may be so intensified also cause severe interference. In these circumstances the directional antenna can be used to eliminate the transmitted power in the other direction.
In most cases omni directional antennas are used. The coverage of the signal strength from an omnidirectional antenna should take the shape of a smooth circle if the ground is perfectly flat. In hilly terrain the coverage of an omnidirectional antenna may be so intensified also cause severe interference. In these circumstances the directional antenna can be used to eliminate the transmitted power in the other direction.
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