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An array factor is a mathematical factor in the directivity equation of an array antenna .. directivity. directivity. array antenna. array antenna. antenna. antenna ( radio ). It is the factor by which the directivity function of an individual antenna must be multiplied to get the directivity of the entire array .. directivity. directivity. antenna. antenna ( radio ). An array antenna is a set of multiple identical antennas which work together as a single antenna .. array antenna. array antenna. antenna. antenna ( radio ). The individual antenna elements are connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase relationship .. antenna. antenna ( radio ). The radio waves from the individual antennas combine and superpose , enhancing radiation in certain directions while suppressing radiation in other directions .. superpose. Superposition principle. The purpose of using multiple antennas in this way is to produce a radiation pattern that could not be achieved by a single antenna .. antenna. antenna ( radio ). radiation pattern. radiation pattern. Usually the goal is higher gain -LRB- directivity -RRB- , more of the power radiated in a specific direction .. directivity. directivity. gain. antenna gain. The radiation pattern of an individual antenna element in isolation is given by a function of the azimuth angle and elevation angle called the directivity , which gives the signal strength radiated at any given angle .. directivity. directivity. antenna. antenna ( radio ). radiation pattern. radiation pattern. azimuth angle. azimuth angle. elevation angle. elevation angle. The radiation pattern of the entire array is given by another directivity function .. directivity. directivity. radiation pattern. radiation pattern. The array factor AF is the factor by which the individual antenna 's directivity must be multiplied to get the array 's directivity. directivity. directivity. antenna. antenna ( radio )