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decibels related to dipole antenna (dBd)

Definition

decibels related to dipole antenna (dBd)

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 I_A 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 I_D µW/m² in its favored direction at the same distance. Then the gain G of antenna A, in dBd, is:

G = 10 log₁₀ (I_A / I_D)

A dipole antenna has a gain of 0 dBd. An isotropic radiator has a gain of -2.15 dBd.

Related glossary terms: MIMO (multiple input, multiple output), service set identifier (SSID), SMS spam (cell phone spam or short messaging service spam), forward error correction (FEC), IR wireless (infrared wireless), American Radio Relay League (ARRL), solar fade (sun interference), MISO (multiple input, single output), 802.11m, no-swipe credit card

This was last updated in April 2005

Posted by: Margaret Rouse

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