"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",
Parabolic Antenna: An antenna consisting of a
parabolic reflector and a radiating or receiving
element at or near its focus.
Path loss: The ratio of received power to transmitted power.
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.
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
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.
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.
Antenna "R" Definitions and Terms
