Electrically short
Encyclopedia
An electrically short antenna
Antenna (radio)
An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...

 is an antenna of length 2h, such that
.
An electrically short transmission line
Transmission line
In communications and electronic engineering, a transmission line is a specialized cable designed to carry alternating current of radio frequency, that is, currents with a frequency high enough that its wave nature must be taken into account...

is a transmission line in which all of its effects will complete within one cycle of an impressed alternating current.
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