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A feed line is a cable that feeds radio signals from a radio antenna to a transmitter or receiver. It connects the antenna to the receiver, transmitter or transceiver and is widely used in wireless communications and broadcasting antenna systems. It transfers the radio frequency energy between the antenna and the receiver. When operated properly, it does not radiate any energy.
Feed lines are also called as RF transmission lines.
Feed lines are specialized cables that connect an antenna to a transmitter or receiver of a radio or wireless communication system.
The most widely used types of feed lines are:
Feed lines carry the radio frequency voltage from one end to the other and hence they are made of specialized cables. Each feed line has its own characteristic impedance which must be matched with that of the antenna to transfer the RF power efficiently. If the impedance is not matched, the RF energy is reflected back to the transmitter, causing energy wastage and overheating of the transmitter. A device called an antenna tuner is used to make the necessary adjustments for efficient transfer of energy.
Some points to remember while using feed lines are: