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Antenna_gain.
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Antenna gain
Antenna gain is the sensitivity of an antenna in a particular direction, compared with the sensitivity of an isotropic antenna in any direction, or a dipole antenna in the equatorial direction. The two measurements are measured in decibels and denoted by dBi and dBd respectively.
For dish-type antennas, gain is proportional to the aperture (reflective area) and surface accuracy of the antenna, as well as the frequency being transmitted/received. In general, a larger aperture antenna has a higher gain. Also, the higher the frequency, the higher the gain. Surface inaccuracies are more of a factor at higher frequencies.
The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
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