"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 nonconductor 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.
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.
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.
Lowest usable frequency: [LUF]. The lowest frequency that will not be
absorbed by the ionosphere or smothered by atmospheric noise.
Antenna "M" Terms and definitions








