Side konspekt 2020 / eksami kordamisküsimused
15
dBd = dBi - 2.15
Specifying antenna gain in dBd means that the antenna in question has the ability to
focus the energy x dB more than a dipole.
24. Kuidas leitakse antenni kiirguse pealehe laius
In a radio antenna's radiation pattern, the main lobe, or main beam, is the lobe
containing the higher power. This is the lobe that exhibits the greater field strength.
The beamwidth of the antenna is the width of the main lobe, usually specified by the
half power beam width (HPBW), the angle encompassed between the points on the side
of the lobe where the power has fallen to half (-3 dB) of its maximum value.
In a radio antenna pattern, the half power beam width is the angle between the half-
power (-3 dB) points of the main lobe, when referenced to the peak effective
radiated power of the main lobe. See beam diameter. Beamwidth is usually but not
always expressed in degrees and for the horizontal plane.
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