"A",
"B",
"C",
"D",
"E",
"F",
"G"/"H",
"I"/"J"/"K"/"L",
"M"/"N"/"O",
"P"/"Q",
"R",
"S",
"T",
"U"/"V"/"W"/"X"/"Y"/"Z"
Panel Antenna: --- Text in review
Parabolic Antenna: An antenna consisting of a
parabolic reflector and a radiating or receiving
element at or near its focus. [below right]
Parabolic Grid Antenna: --- Text in review
Parabolic Reflector. An antenna reflector in the shape of a parabola. It converts spherical
wavefronts from the radiating element into plane wavefronts.
Parasitic Array. An antenna array containing one or more elements not connected to the
transmission line.
Parasitic Element. The passive element of an antenna array that is connected to neither the
transmission line nor the driven element.
Path loss: The ratio of received power to transmitted power.
Patch Panel Antenna: --- Text in review
Pedestal: --- Text in review. Also refer to Companies producing Antenna Pedestals.
Pencil Beam: A narrow circular radar beam from a highly directional antenna (such as a parabolic reflector).
Periodic Antenna: An antenna whose impedance varies as the frequency does. An antenna that has an
approximately constant input impedance over a
narrow range of frequencies.
Periscope Antenna: An antenna configuration in
which the transmitting antenna is oriented to produce
a vertical radiation pattern, and a flat or off-axis
parabolic reflector, mounted above the transmitting
antenna, is used to direct the beam in a horizontal
path toward the receiving antenna.
Phased Array Antenna A phase array is a group of antenna in which the relative phases of the respected signals
feeding the antenna are varied in such a way that the effective radiation pattern of the array
is reinforced in a desired direction and suppressed in undesired directions.
Planar Array: An antenna in which all of the
elements, both active and parasitic, are in one plane.
Polarization: The direction of the electric field of a radiated wave
relative to the surface of the Earth (vertical, horizontal, linear, and
circular).
Polarization fading: Fading due to polarization rotation of a
received signal. The received signal decreases when the incoming
wave does not have the same polarization as the receiving antenna.
Power gain: The directive gain of an antenna multiplied by its
efficiency. In an antenna, the ratio of its radiated power to that of a reference.
Propagation: A phenomenon by which any wave moves from one
point to another; the travel of electromagnetic waves through space
of along a transmission line.
Propagation path: The path or route over which power flows
from the transmitter to the receiver.
Q Antenna. An Dipole antenna matched to the transmission line by a stub.
Quad antenna. An antenna which consists of two square loops which are cut to a quarter wavelength.
Quarter-wave Antenna: An antenna with an electrical length that
is equal to one-quarter wavelength of the signal being transmitter or
received. As as a Marconi Antenna.
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Antenna "R" Definitions and Terms
