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.
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Famous quotes containing the word length:
“A needless Alexandrine ends the song,
That, like a wounded snake, drags its slow length along.”
—Alexander Pope (1688–1744)
“With the ancient is wisdom; and in length of days understanding.”
—Bible: Hebrew Job 12:12.
“To find the length of an object, we have to perform certain
physical operations. The concept of length is therefore fixed when the operations by which length is measured are fixed: that is, the concept of length involves as much as and nothing more than the set of operations by which length is determined.”
—Percy W. Bridgman (1882–1961)