Length
Whip antennas are normally designed as resonant antennas. Therefore the length of the whip antenna is determined by the wavelength of the radio waves used. The most common length is one-quarter of the wavelength, called a quarter-wave whip (although this type of antenna is often shortened by the use of a loading coil; see Electrically short whips below). For example, the common quarter-wave whip antennas used on FM radios in the USA are approximately 75 cm long, which is roughly one-quarter the length of radio waves in the FM radio band, which are 2.78 to 3.41 meters long. Half-wave whip antennas are also common.
Read more about this topic: Whip Antenna
Famous quotes containing the word length:
“Rivers must have been the guides which conducted the footsteps of the first travelers. They are the constant lure, when they flow by our doors, to distant enterprise and adventure; and, by a natural impulse, the dwellers on their banks will at length accompany their currents to the lowlands of the globe, or explore at their invitation the interior of continents.”
—Henry David Thoreau (1817–1862)
“The light that was shadowed then
Was seen to be our lives,
Everything about us that love might wish to examine,
Then put away for a certain length of time, until
The whole is to be reviewed, and we turned
Toward each other, to each other.”
—John Ashbery (b. 1927)
“With the ancient is wisdom; and in length of days understanding.”
—Bible: Hebrew Job, 12:12.