The Feed line in a radiotransmission, reception or transceiver system is the physical cabling that carries the RF signal to and/or from the antenna. It is also called a transmission line. When operating properly, and under ideal conditions, the feed line should successfully carry all of the RF energy without any signal loss, and without radiating any energy or absorbing any energy. There are three common types of feed lines in use in modern wireless systems: the coaxial type, the twin-lead, and, at frequencies above 1 GHz, a waveguide is used.
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