An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves.- Antenna array
A number of such dipole elements can be combined into an antenna array such as the Yagi-Uda in order to favor a single horizontal direction, thus termed a beam antenna.- Antenna (radio)
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In antenna theory, a phased array usually means an electronically scanned array, a computer-controlled array of antennas which creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas.
A Yagi–Uda antenna or simply Yagi antenna, is a directional antenna consisting of two or more parallel resonant antenna elements in an end-fire array; these elements are most often metal rods acting as half-wave dipoles.
In electromagnetics, directivity is a parameter of an antenna or optical system which measures the degree to which the radiation emitted is concentrated in a single direction.
In an antenna array the directivity is a complicated calculation in the general case.
A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor, that is usually fed by a balanced source or feeding a balanced load.
There may be one or more additional loops stacked parallel to the first as parasitic elements or driven elements, creating an antenna array which is unidirectional with increased gain.