Feed line (original) (raw)
給電線（きゅうでんせん、英: feed line, feeder）とは、無線通信において送信機からアンテナへ（またはアンテナから受信機へ）高周波電流を伝送するケーブルなどの伝送線路である。また、給電線とアンテナとの接続点を（feed point）という。
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| dbo:abstract | In a radio antenna, the feed line (feedline), or feeder, 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. (en) 給電線（きゅうでんせん、英: feed line, feeder）とは、無線通信において送信機からアンテナへ（またはアンテナから受信機へ）高周波電流を伝送するケーブルなどの伝送線路である。また、給電線とアンテナとの接続点を（feed point）という。 (ja) Fider – fizyczne okablowanie przenoszące sygnał radiowy z nadajnika do anteny lub z anteny do odbiornika, nazywane też linią transmisyjną. Podczas prawidłowego działania, w idealnych warunkach, fider powinien skutecznie przenosić wszystkie fale radiowe bez jakichkolwiek strat sygnału, bez promieniowania i pochłaniania energii. Używane są trzy rodzaje fiderów: koncentryczne, symetryczne (w tym tak zwane drabinki) oraz falowody (przy częstotliwościach powyżej 1 GHz). Fider jest bardzo ważną częścią układu antenowego, zwłaszcza w pewnych warunkach, jak wysokie częstotliwości lub słabe sygnały radiowe lub oba czynniki naraz. Okablowanie układu zasilania posiada swoją impedancję, która musi być dopasowana do nadajnika/odbiornika/transceivera i anteny, aby zapobiec stratom sygnału. Dopasowanie to możliwe jest przy pomocy symetryzatora antenowego. (pl) |
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| rdfs:comment | 給電線（きゅうでんせん、英: feed line, feeder）とは、無線通信において送信機からアンテナへ（またはアンテナから受信機へ）高周波電流を伝送するケーブルなどの伝送線路である。また、給電線とアンテナとの接続点を（feed point）という。 (ja) In a radio antenna, the feed line (feedline), or feeder, 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. (en) Fider – fizyczne okablowanie przenoszące sygnał radiowy z nadajnika do anteny lub z anteny do odbiornika, nazywane też linią transmisyjną. Podczas prawidłowego działania, w idealnych warunkach, fider powinien skutecznie przenosić wszystkie fale radiowe bez jakichkolwiek strat sygnału, bez promieniowania i pochłaniania energii. Używane są trzy rodzaje fiderów: koncentryczne, symetryczne (w tym tak zwane drabinki) oraz falowody (przy częstotliwościach powyżej 1 GHz). (pl) |
| rdfs:label | Feed line (en) Linea di alimentazione (it) 給電線 (ja) Fider (pl) |
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