A directional antenna is an antenna which transmits or receives maximum power in a particular direction. Download high resolution version (480x640, 50 KB)Image of a log-periodic dipole array. ... Download high resolution version (480x640, 50 KB)Image of a log-periodic dipole array. ... A yagi antenna Most simply, an antenna is an electronic component designed to send or receive radio waves. ...
All practical antennas are at least somewhat directional, although usually only the direction in the plane parallel to the earth is considered, and practical antennas can easily be omnidirectional in one plane. An omnidirectional antenna is an antenna system which radiates maximum power uniformly in all directions. ...
The most common types are the yagi antenna, the log-periodic antenna, and the corner reflector, which are frequently combined and commercially sold as residential TV antennas. A Yagi-Uda antenna. ... Log-periodic dipole array In telecommunication, a log-periodic antenna (LP, also known as a log-periodic array) is a broadband, multielement, unidirectional, narrow-beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency. ... Buoy in San Diego Harbor. ...
Without a doubt, AM directionalantenna systems are probably one of the most misunderstood pieces of equipment in a radio station.
DirectionalAntenna systems are made up of two or more vertical radiators.
Layton is a regular contributor of technical articles to the Radio World newspaper and is the author of Directional Broadcast Antenna: A guide to adjustment, Measurement and Testing, TAB Books 1974.
For long term installation outdoors it would be prudent to house the antenna and N connection in a plastic food container (check that it is safe for use in a microwave oven first, and be aware that some plastics effect signal strength).
When we have used this antenna it has been sufficient to screw it to the cable and affix the cable securely; this is using URM67 coaxial cable which is 10mm outer diameter and resists bending.
In use on a flat field, using two of these antennae attached to pcmcia 802.11b cards via cable and pigtails, we were able to maintain an 11Mb/s network at between 400 to 500 metres with clear line of sight.
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