If an antenna has a dBd of 8.6, what is the dBi value?
A.
6.2
B.
6.46
C.
8.6
D.
10.74
E.
12.88
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Antenna performance is measured in dBi (the antennas gain/loss over a theoretical isotropic antenna)
dBd (the antennas gain/loss over a dipole antenna)
dBi = dBd + 2.15
dBd = dBi – 2.15
0
0
8.6 + 2.15 =10.75
0
0
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.
0
0