"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"
Impedance: The total opposition offered by a circuit or component
to the flow of alternating current.
Impedance match: The condition where the load impedance
equals the characteristic impedance of a transmission line.
Inductance: The natural property of an electrical circuit which
opposes the rate of change or current, i.e., electrical intertia.
In phase: Two or more signals of the same frequency passing
through their maximum and minimum values of like polarity at the
same instant.
Insulator: A device or material that has a high electrical resistance;
a non-conductor of electricity.
Interference: A degradation of a received signal caused by
another transmitter, a noise source, or the desired signal propagation
over two or more different routes.
Inverted L antenna: A half-wave dipole fed by a one-quarter
wavelength long vertical section.
Inverted vee antenna: A half-wave dipole erected in the form of
an upside-down vee, with the feed point at the apex. It is essentially
omnidirectional, and is sometimes called a dropping doublet.
Ionization: The process where radiation and particles from the
Sun make some of the Earths atmosphere partially conductive.
Ionosphere: A partially conducting region of the Earths atmosphere
between 50 kms and 400 kms high.
J-ANTENNA. A half-wave antenna.
Lambda: Greek lower case letter. Used to represent a wavelength
with reference to electrical dimensions in antenna work.
linearly polarized antennas, Antennas that produce only one
polarization.
Line of sight: [LOS]. The transmission path of a wave that travels directly
from the transmitting antenna to the receiving antenna.
Load: A device that consumes electrical power.
Loading: Providing or connecting an electrical device capable of
accepting power to match the impedance of an antenna to a transmitter
so that maximum power is radiated from a generating device,
such as a transmitter.
Lobe: A bulge on an antenna radiation pattern which indicates the
direction in which radiated power is concentrated. An area of greater signal strength in the transmission pattern of an antenna.
Antenna Main Lobe Pattern
Log-Periodic (LP) Antenna: A broadband, multielement, unidirectional, narrow-beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency.
Long-wire antenna: An antenna that is a wavelength or more long at its operating frequency. An end fed single wire antenna usually one wavelength or longer. An area of a radiation pattern plotted on a polar-coordinate graph that represents maximum radiation.
Loop Antenna: A style of antenna used for UHF reception [TV].
Loop Antenna
Lowest usable frequency: [LUF]. The lowest frequency that will not be absorbed by the ionosphere or smothered by atmospheric noise. LPDA: Log Periodic Dipole Antenna
Antenna "M" Terms and definitions
