Element pattern, Array pattern.
The polar radiation pattern of a single element is called the "element pattern". It is possible for the array to be built recursively; for example the element may itself be an array.
A Yagi-Uda antenna is an array of dipoles with different amplitudes and phases of the dipole currents.
The array pattern is the polar radiation pattern which would result if the elements were replaced by isotropic radiators, having the same amplitude and phase of excitation as the actual elements, and spaced at points on a grid corresponding to the element
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