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A phased array is an array of antennas (with transmitters or receivers) for which the phase of the signal is used to transmit or receive a particular frequency to/from a particular direction. In commercial radio, one can be used to direct and strengthen an AM signal through control the phases of the carrier frequency.
In radio astronomy, adjusting the individual timing (phase) of signals combined from multiple fixed antennas can select a specific frequency from a specific direction, making an array of non-movable antennas aimable. An aperture array is a radio telescope consisting of such phased array of fixed antennas. Among the telescopes having (or including) such configurations:
A phased array feed is an array of receivers set at the focus of a dish radio antenna, an alternative to a horn feed. Phased array feeds have been tried in a number of traditional radio telescopes such as Green Bank Telescope (GBT).