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dBd (decibels related to dipole antenna) is a measure of the gain of an antenna system
relative to a dipole antenna at radio frequency.
The dBd specification is based on the decibel, a
logarithmic measure of relative power. Suppose an antenna A
produces an electromagnetic field of intensity IA microwatts per square meter (µW/m2) in its
favored direction at a point located a defined distance away. Also, suppose a
half-wave dipole antenna D produces an electromagnetic field of intensity ID
µW/m2 in its favored direction at the same distance. Then the gain G
of antenna A, in dBd, is:
G = 10 log10 (IA / ID)
A dipole antenna has a gain of 0 dBd. An isotropic radiator has a gain of -2.15 dBd.
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| LAST UPDATED: |
11 Apr 2003
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