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- Feed_line abstract "In a radio antenna, the feed line is the cable or other transmission line that connects the antenna with the radio transmitter or receiver. In a transmitting antenna, it feeds the radio frequency (RF) current from the transmitter to the antenna, where it is radiated as radio waves. In a receiving antenna it transfers the tiny RF voltage induced in the antenna by the radio wave to the receiver. In order to carry RF current efficiently, feed lines are made of specialized types of cable called transmission line. The most widely used types of feed line are coaxial cable, twin-lead, ladder line, and at microwave frequencies, waveguide.Particularly with a transmitting antenna, the feed line is a critical component that must be adjusted to work correctly with the antenna and transmitter. Each type of transmission line has a specific characteristic impedance. This must be matched to the impedance of the antenna and the transmitter, to transfer power efficiently to the antenna. If these impedances are not matched it can cause a condition called standing waves on the feed line, in which the RF energy is reflected back toward the transmitter, wasting energy and possibly overheating the transmitter. This adjustment is done with a device called an antenna tuner in the transmitter, and sometimes a matching network at the antenna. The degree of mismatch between the feedline and the antenna is measured by an instrument called an SWR meter (standing wave ratio meter), which measures the standing wave ratio (SWR) on the line.".
- Feed_line wikiPageID "1826418".
- Feed_line wikiPageRevisionID "600108455".
- Feed_line hasPhotoCollection Feed_line.
- Feed_line subject Category:Antennas_(radio).
- Feed_line subject Category:Broadcast_engineering.
- Feed_line subject Category:Radio_electronics.
- Feed_line subject Category:Telecommunications_equipment.
- Feed_line comment "In a radio antenna, the feed line is the cable or other transmission line that connects the antenna with the radio transmitter or receiver. In a transmitting antenna, it feeds the radio frequency (RF) current from the transmitter to the antenna, where it is radiated as radio waves. In a receiving antenna it transfers the tiny RF voltage induced in the antenna by the radio wave to the receiver.".
- Feed_line label "Feed line".
- Feed_line label "Fider".
- Feed_line label "給電線".
- Feed_line sameAs 給電線.
- Feed_line sameAs Fider.
- Feed_line sameAs m.05_05t.
- Feed_line sameAs Q3497044.
- Feed_line sameAs Q3497044.
- Feed_line wasDerivedFrom Feed_line?oldid=600108455.
- Feed_line isPrimaryTopicOf Feed_line.