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RF repeater

Electronic repeaters enable a relatively low-power original signal, such as that from a mobile telephone unit, to be transmitted with power orders of magnitude greater than the original signal. In a typical cellular wireless system, an area is divided geographically into a number of cell sites, each defined by a radio frequency (RF) radiation pattern from a respective base transceiver station (BTS) antenna. A base station communicates with mobile communication devices via communication channels, known in the art as ground links. By itself, a base station can only cover a limited area with ground links. This limited coverage area is referred to as a cell. Repeater systems are typically used where the area to be covered and/or capacity requirements do not justify the installation of a full base station system with managed frequency-channel allocation. The repeater advantageously improves the quality of a radio connection between the base station and the subscriber terminal. The repeater, as compared with the base station, provides a considerable saving particularly in telecommunication connections, because it does not need expensive fixed transmission capacity which is required between the base station and a base station controller. The typical repeater system comprises a link antenna which is directed at the base station antenna, repeater electronics, and a broadcast antenna.

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