| the surface described by the extremity of a radius vector whose magnitude is a specified function of the magnitude of a component of the field produced by an antenna at a constant distance in the direction of the vector
NOTE 1 – The radiation pattern surface in the far-field region is most frequently considered.
NOTE 2 – In French, the term "surface de directivité" is the preferred term when the surface does not depend upon the power fed to the antenna.
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