The redirection of this energy has the effect of providing more energy in one direction, and less energy in all other directions.īeamwidths are defined in both horizontal and vertical plains. Instead, an antenna simply redirects the energy it receives from the transmitter. These angles are measured in degrees and are called beamwidths.Īn antenna is a passive device which does not offer any added power to the signal. The coverage area or radiation pattern is measured in degrees. This provides a greater coverage distance, but with a reduced coverage angle. As the gain of a directional antenna increases, the angle of radiation usually decreases. Direction is the shape of the transmission pattern. Gain is the amount of increase in energy that an antenna adds to a radio frequency (RF) signal. Basic Definitions and Antenna ConceptsĪn antenna gives the wireless system three fundamental properties: gain, direction and polarization. Refer to Cisco Technical Tips Conventions for more information on document conventions. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. This document gives basic antenna definitions and discusses antenna concepts with a focus on the pros and cons of omni and directional antennas.
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