Anritsu S412E User Manual page 137

Glossary of Terms
Antenna Gain : Antenna gain, also known as antenna directivity, is the relative gain of
Antenna, Isotropic : An isotropic antenna is a theoretical point source radiating a spherical
Antenna, Parabolic : A parabolic antenna is an antenna utilizing a reflector that is shaped as
Attenuation : Attenuation refers to decreasing in signal magnitude between two
Attenuator : Attenuator is a device specifically designed to decrease the magnitude
Average power : Average power is the peak power averaged over time and is usually
Band Pass Filter : A Band Pass Filter is a radio wave filter with a specific range of
Bandwidth : Bandwidth usually identifies the capacity of a circuit or amount of data
S412E UG
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.
power envelope.
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.
points. These points may be along a radio path, transmission line or
other devices.
of a signal transmitted through it.
applied to pulsed systems where the carrier power is switched on and
off.
frequencies in which it is designed to pass. It rejects frequencies outside
the pass-band range. A resistor-inductor-capacitor circuit is an example
of a Band Pass Filter.
that can be sent through a given circuit. It may be user-specified in a
PVC. It is an indication of the amount of data that is passing over a
medium. Also, bandwidth is the portion of the frequency spectrum
required to transmit desired information. Each radio channel has a
center frequency and additional frequencies above and below this
carrier frequency which is used to carry the transmitted information.
The range of frequencies from the lowest to the highest used is called
the bandwidth.
PN: 10580-00318 Rev. P
D-2 Glossary of Terms
D-3