Loop antennas consist of a loop or coil of wire. Loops with circumference of a wavelength or larger act similarly to dipole antennas. However loops small in comparison to a wavelength act differently. They interact with the magnetic field of the radio wave instead of the electric field as other antennas do, and so are relatively insensitive to nearby electrical noise. However they have low radiation resistance, and so are inefficient for transmitting. They are used as receiving antennas at low frequencies, and also as direction finding antennas. COUNT 5
QSN1 What type of antenna can be formed by a circular segment of wire? ANS1 Loop antennas QSN2 What is a loop antenna compared with to determine its beahvior? ANS2 circumference of a wavelength QSN3 If you needed to place an antenna somewhere with a large amount of interference, which type would be best? ANS3 loops small QSN4 Why would this type be good for receiving but not transmtting? ANS4 low radiation resistance QSN5 What else would be an effective application of this antenna type? ANS5 direction finding