Glossary of Terms
H-2 PN: 10580-00305 Rev. L MS20xxC UG
Antenna
beamwidth : Antenna beamwidth, also known as the half-power beamwidth, is the
angle of an antenna pattern or beam over which the relative power is at
or above 50% of the peak power.
Antenna Directivity : Antenna directivity, also known as antenna gain, is the relative gain of
the main beam of an antenna pattern to a reference antenna, usually an
isotropic or standard dipole. Antenna Directivity is the percentage of
radiated signal transmitted or received in a given direction related to
beamwidth.
Antenna Efficiency : Antenna Efficiency is the percentage of theoretical gain actually
realized from an antenna.
Antenna Gain : Antenna gain, also known as antenna directivity, is the relative gain of
the main beam of an antenna pattern to a reference antenna, usually an
isotropic or standard dipole. Antenna Gain is the effectiveness of a
directional antenna expressed as the ratio of input power of the
directional antenna to input power of an isotropic radiator to provide
the same field strength in the desired direction. Sometimes related to a
dipole antenna.
Antenna, Isotropic : An isotropic antenna is a theoretical point source radiating a spherical
power envelope.
Antenna, Parabolic : A parabolic antenna is an antenna utilizing a reflector that is shaped as
a paraboloid in order to both concentrate the radiated signal into a
beam and to provide considerable gain. Beamwidth varies inversely and
gain varies directly with the size of the antenna and with frequency.
Attenuation : Attenuation refers to decreasing in signal magnitude between two
points. These points may be along a radio path, transmission line or
other devices.
Attenuator : Attenuator is a device specifically designed to decrease the magnitude
of a signal transmitted through it.
Average power : Average power is the peak power averaged over time and is usually
applied to pulsed systems where the carrier power is switched on and
off.
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