Radio frequency power transmission
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Solec_Kujawski_longwave_antenna_feeder.jpg/220px-Solec_Kujawski_longwave_antenna_feeder.jpg)
Radio frequency power transmission is the transmission of the output power of a transmitter to an antenna. When the antenna is not situated close to the transmitter, special transmission lines are required.[1]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Feederanspeisung_Nordmast_Bisamberg.jpg/220px-Feederanspeisung_Nordmast_Bisamberg.jpg)
The most common type of transmission line for this purpose is large-diameter coaxial cable. At high-power transmitters, cage lines are used. Cage lines are a kind of overhead line similar in construction to coaxial cables. The interior conductor is held by insulators mounted on a circular device in the middle. On the circular device, there are wires for the other pole of the line.
Cage lines are used at high-power transmitters in Europe, like longwave transmitter Topolna, longwave-transmitter Solec Kujawski and some other high-power transmitters for long-, medium- and shortwave.
For UHF and VHF, Goubau lines are sometimes used. They consist of an insulated single wire mounted on insulators. On a Goubau line, the wave travels as longitudinal currents surrounded by transverse EM fields. For microwaves, waveguides are used.
References
- ^ "RF power: How RF energy harvesting works". Arrow.
External links
- Cage lines of Solec Kujawski transmitter[dead link]
- Cage lines of longwave transmitter Topolna (second image) (third image)
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