Difference between revisions of "Loop antenna"
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Revision as of 14:14, 19 February 2016
A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line (or a balun).
Description
Within this physical description there are two very distinct antenna designs:
- The small loop (or magnetic loop) with a size much smaller than a wavelength
- The much larger resonant loop antenna with a circumference close to the intended wavelength of operation
Small loops
Small loops have a poor efficiency and are mainly used as receiving antennas at low frequencies. Except for car radios, almost every AM broadcast receiver sold has such an antenna built inside it or directly attached to it.
Small loop antennas are also used for radio direction finding.
Amateur radio
In amateur radio, loop antennas are often used for low profile operating where larger antennas would be inconvenient, unsightly, or banned.
Loop antennas are relatively easy to build.
See also
External links
- Loop antenna @ Wikipedia
