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:
“At length to hospital
This man was limited,
Where screens leant on the wall
And idle headphones hung.
Since he would soon be dead
They let his wife come along
And pour out tea, each day.”
—Philip Larkin (1922–1986)
“You will, I am sure, agree with me that ... if page 534 only finds us in the second chapter, the length of the first one must have been really intolerable.”
—Sir Arthur Conan Doyle (1859–1930)
“Unless a group of workers know their work is under surveillance, that they are being rated as fairly as human beings, with the fallibility that goes with human judgment, can rate them, and that at least an attempt is made to measure their worth to an organization in relative terms, they are likely to sink back on length of service as the sole reason for retention and promotion.”
—Mary Barnett Gilson (1877–?)